Diagnostics-Other

DI4V4-01

Vehicle Brought to Workshop

Customer Problem AnalysisP. DI-441

Check and Clear DTC (Precheck)P. DI-442

Items inside are titles of pages in this manual,with the page number in the bottom portion. Seethe pages for detailed explanations.

Problem Symptom Confirmation Symptom SimulationP. IN-18

Symptomdoes not occur

Symptomoccurs

DTC CheckP. DI-442

Sensor CheckCircuit Inspection

P. DI-453 ∼ DI-498

DTC ChartP. DI-447

Malfunction code

Problem Symptoms ChartP. DI-452

Check for Fluid LeakageP. DI-498

Identification of Problem

Normal code

Repair

Confirmation Test

End

1

2

3 4

5

6 7

89

10

11

Step 2, 5, 8, 9, 11: Diagnostic steps permitting the use of theTOYOTA hand-held tester or TOYOTAbreak-out-box.

DI-440-DIAGNOSTICS ANTI-LOCK BRAKE SYSTEM

668Author: Date:

1997 SUPRA (RM502U)

ANTI-LOCK BRAKE SYSTEMHOW TO PROCEED WITH TROUBLESHOOTINGTroubleshooting in accordance with the procedure on the following pages.

DI4V5-01

ABS Check SheetInspector’sName :

Customer’s Name

Date VehicleBrought In

Registration Year

Registration No.

Frame No.

Odometer Reading

/ /

/ /

Date Problem First Occurred

Frequency Problem Occurs

/ /

Continuous Intermittent ( times a day)

Remains ON Does not Light Up

Symptoms

kmmiles

ABS does not operate.

ABS Warning LightAbnormal

ABS does not operate efficiently.

Check ItemTRAC IndicatorLight Normal Does not Light Up

2nd Time

Normal Code Malfunction Code (Code )


1st TimeDTC Check

-DIAGNOSTICS ANTI-LOCK BRAKE SYSTEMDI-441

669Author: Date:

1997 SUPRA (RM502U)

CUSTOMER PROBLEM ANALYSIS CHECK

DI4V6-01

F02620

R06980

Short Pin

DLC1

S−17−1 Iei−23−1−A F00041

DLC2

Tc E1

DLC1

Tc

E1

R01346

Normal Code2 sec.

ON

OFF

0.25sec.

0.25sec.

Code 11 and 21

0.5sec.

4 sec.1.5sec. 2.5 sec.

0.5sec.

Code 21Code 11

ON

OFF


670Author: Date:

1997 SUPRA (RM502U)

PRE-CHECK1. DIAGNOSIS SYSTEM(a) Check the Indicator,

When the ignition switch is turned ON, check that the ABSwarning light goes on for 3 seconds.

HINT:If the indicator check result is not normal, proceed to trouble-shooting for the ABS warning light circuit (See page DI-488 ).

(b) Check the DTC.(1) Turn the ignition switch ON.(2) Disconnect the short pin from DLC1.

(3) Using SST, connect terminals Tc and E1 of DLC2 orDLC1.

SST 09843-18020(4) Read the DTC from the ABS warning light on the

combination meter.HINT:If no code appears, inspect the diagnostic circuit or ABS warn-ing light circuit (See page DI-494 or DI-488 ).

As an example, the blinking patterns for normal code andcodes 11 and 21 are shown on the left.(5) Codes are explained in the code table on page

DI-447 .(6) After completing the check, disconnect terminals Tc

and E1, and turn off the display.If 2 or more malfunctions are indicated at the same time, thelowest numbered DTC will be displayed 1st.

FI6997

TOYOTAHand-held tester

DLC2

BR3890

R06980

Short Pin

DLC1

N09348

TOYOTA hand-held tester

ECU

TOYOTA brake-out-box


671Author: Date:

1997 SUPRA (RM502U)

(c) Using TOYOTA hand-held tester, check the DTC.(1) Hook up the TOYOTA hand- held tester to the

DLC2.(2) Read the DTC by following the prompts on the tes-

ter screen.Please refer to the TOYOTA hand-held tester oper-ator’s manual for further details.

(d) Clear the DTC.(1) Using SST, connect terminals Tc and E1 of DLC2 or

DLC1 and remove the short pin from DLC1.SST 09843-18020(2) IG switch ON.(3) Clear the DTC stored in ECU by depressing the

brake pedal 8 or more times within 5 seconds.(4) Check that the warning light shows the normal

code.

(5) Remove the SST from the terminals of DLC2 orDLC1.

SST 09843-18020(6) Connect the short pin to DLC1.

HINT:Disconnecting the battery cable during repairs will not erase theDTC in the ECU.

(e) Using TOYOTA brake-out-box and TOYOTA hand-heldtester, measure the ECU terminal values.(1) Turn the IG switch OFF.(2) Hook up the TOYOTA hand-held tester and TOYO-

TA break-out-box to the vehicle.(3) Turn the IG switch ON.(4) Read the ECU input/output values by following the

prompts on the tester screen.HINT:TOYOTA hand-held tester has a ”Snapshot” function.This records the measured values and is effective in the diagno-sis of intermittent problems.Please refer to the TOYOTA hand-held tester/TOYOTA break-out-box operator’s manual for further details.

F00007

E1

TcTs

lei-23-1-A

DLC1

BR3904

0.13 sec. 0.13 sec.

ON

OFF

BR3893

Malfunction Code (Example Code 72, 76)

7 2 7 6

ON

OFF

0.5 sec. 0.5 sec.

1.5 sec.

0.5 sec. 0.5 sec.

2.5 sec. 4 sec.

Repeat


672Author: Date:

1997 SUPRA (RM502U)

2. SPEED SENSOR SIGNAL AND DECELERATION SEN-SOR

(a) Check the speed sensor signal and deceleration sensor.(1) Turn the ignition switch OFF(2) Using SST, connect terminal Ts and E1 of DLC1.SST 09843-18020(3) Start the engine.

(4) Check that the ABS warning light blinks.HINT: If the ABS warning light does not blink, inspect the ABS

warning light circuit (See page DI-488 ). If the ABS warning light is always on, inspect and repair,

deceleration sensor.(5) Drive the vehicle faster than 45 km/h (28 mph) for

several seconds.(6) Stop the vehicle.(7) Using SST, connect terminals Tc an E1 of DLC1.SST 09843-18020(8) Read the number of blinks of the ABS warning light.

HINT: See the list of DTC shown on the next page. If every sensor is normal, a normal code is output (A cycle

of 0.25 sec. ON and 0.25 sec. OFF is repeated). If 2 or more malfunctions are indicated at the same time,

the lowest numbered code will be displayed 1st.

(9) After doing the check, disconnect terminals Ts andE1, Tc and E1 of DLC1, and turn ignition switch OFF.

FI6997

TOYOTAHand-held tester

DLC2


673Author: Date:

1997 SUPRA (RM502U)

(b) Using TOYOTA hand-held tester, check the DTC.(1) Do step (1) - (6) on the previous page.(2) Hook up the TOYOTA hand- held tester to the

DLC2.(3) Read the DTC by following the prompts on the tes-

ter screen.Please refer to the TOYOTA hand-held tester oper-ator’s manual for farther details.

DTC of speed sensor check function:

Code No. Diagnosis Trouble Area

71 Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Sensor Rotor

72 Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Sensor Rotor

73 Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Sensor Rotor

74 Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Sensor Rotor

75 Abnormal change in output voltage of right front speed sensor Right front speed sensor rotor

76 Abnormal change in output voltage of left front speed sensor Left front speed sensor rotor

77 Abnormal change in output voltage of right rear speed sensor Right rear speed sensor rotor

78 Abnormal change in output voltage of left rear speed sensor Left rear speed sensor rotor

79* Deceleration sensor is faultyDeceleration sensor

Sensor installation

*: SPORT ABS (2JZ-GTE Engine) only

R10305

GL2

VGS GGND

GL1

Rear Side

Front Side


674Author: Date:

1997 SUPRA (RM502U)

3. DECELERATION SENSOR OPERATION DIAGNOSISSYSTEM

CAUTION:While checking the deceleration sensor operating diagno-sis system, the Anti-lock Brake System does not work andbrake system works as a conventional brake system.

(a) Deceleration sensor inspection check of decelerationsensor output:(1) Connect 3 dry batteries of 1.5 V in series.(2) Connect VGS terminal to the batteries’ positive (+)

terminal, and GGND terminal to the batteries’ nega-tive (-) terminal, apply about 4.5 V between VGS-GGND terminals.

NOTICE:Do not apply voltage of 6 V or more to terminals VGS andGGND.

(3) Check the output of GL1 and GL2 terminals.

Symbols Condition Standard Value

GL1 Horizontal about 2.3 V

GL1 Lean forward 0.4 - about 2.3 V

GL1 Lean rearward about 2.3 V - 4.1 V

GL2 Horizontal about 2.3 V

GL2 Lean forward about 2.3 V - 4.1 V

GL2 Lean rearward 0.4 - about 2.3 V

HINT: If the senor is tilted too much it may show the wrong value. If dropped, the sensor should be replaced with a new one. The sensor removed from the vehicle should not be

placed upside down.

DI4V7-01


675Author: Date:

1997 SUPRA (RM502U)

DIAGNOSTIC TROUBLE CODE CHARTIf a malfunction code is displayed during the DTC check, check the circuit listed for that code. For detailsof each code, turn to the page referred to under the ”See page” for the respective ”DTC No.” in the DTC chart.HINT: Using SST 09843-18020, connect the terminals Tc and E1, and remove the short pin. If any abnormality is not found when inspect each inspection parts, inspect the ECU.

DTC No.

(See Page)Detection Item Trouble Area

11

(DI-453 )Open circuit in ABS solenoid relay circuit

ABS solenoid relay

Open or short in ABS solenoid relay circuit

12

(DI-453 )Short circuit in ABS solenoid relay circuit

ABS solenoid relay

B+ short in ABS solenoid relay circuit

13*2

(DI-460 )Open circuit in ABS motor relay circuit

ABS motor relay

Open or short in ABS motor relay circuit

14

(DI-460 )Short circuit in ABS motor relay circuit

ABS motor relay

B+ short in ABS motor relay circuit

21

(DI-466 )

Open or short circuit in 2-position solenoid circuit for right front

wheel

ABS actuator

Open or short in SFRH or SFRR circuit

22

(DI-466 )

Open or short circuit in 2-position solenoid circuit for left front

wheel

ABS actuator

Open or short in SFLH or SFLR circuit

23

(DI-466 )

Open or short circuit in 2-position solenoid circuit for right rear

wheel

ABS actuator

Open or short in SRH (SRRH) or SRR (SRRR) circuit

24*1

(DI-466 )

Open or short circuit in 2-position solenoid circuit for left rear

wheel

ABS actuator

Open or short in SRLH or SRLR circuit

31*2

(DI-469 )Right front wheel speed sensor signal malfunction

32*2

(DI-469 )Left front wheel speed sensor signal malfunction

Right front, left front, right rear and left rear speed sensor

O h t i h d i it33*2

(DI-469 )Right rear wheel speed sensor signal malfunction

Open or short in each speed sensor circuit

Speed sensor rotor

34*2

(DI-469 )Left rear wheel speed sensor signal malfunction

41

(DI-475 )Low battery positive voltage

Battery

IC regulator

Open or short in power source circuit

43*1

(DI-479 )

Malfunction in deceleration sensor

(constant output)

Deceleration sensor

Wire harness for deceleration sensor system

44*1

(DI-480 )Open or short in deceleration sensor circuit

Deceleration sensor

Open or short in deceleration sensor circuit

45*1

(DI-479 )Malfunction in deceleration sensor

Deceleration sensor


49

(DI-482 )Open circuit in stop light switch circuit Open in stop light circuit

51*2

(DI-484 )

Pump motor is locked

Open in pump motor groundABS pump motor

Always

ON

(DI-485 )

Malfunction in ECU

IG power source circuit

Battery

IC regulator



676Author: Date:

1997 SUPRA (RM502U)

*1: Short ABS (2JZ-GTE Engine) only*2: As DTC cannot be erased by replacing parts alone, do either of the following operations. Clear DTC (See page DI-442 ). At the vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.

DI4V8-01

W02807

2JZ-GE:

2JZ-GTE:

2JZ-GTE:

SPORT AVS (2JZ-GTE Engine):

ABS ControlRelay

ABS SolenoidRelay

ABS Motor Relay

ABS Actuator

Deceleration Sensor

ABS Warning Light

ABS ECU

DLC1

DLC2

Front Speed Sensor Rotor

Rear Speed Sensor

Rear Speed Sensor Rotor

Front Speed Sensor


677Author: Date:

1997 SUPRA (RM502U)

PARTS LOCATION

DI7HM-01

W01411

123456

7891011121234567891011

1213141516171819202122

A18 A19


678Author: Date:

1997 SUPRA (RM502U)

TERMINALS OF ECU

NORMAL ABS (2JZ-GE Engine):

Symbols (Terminal No.) STD Voltage (V) Condition

IG1 (A18-2) - GND (A19-2,13) 10 - 14 IG switch ON

SR (A19-18) - R+ (A19-8) Below 1.5 IG switch ON, ABS warning light OFF

MR (A19-7) - R+ (A19-8) 10 - 14 IG switch ON

SFRH (A19-4) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

SFRR (A19-1) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

SFLH (A19-10) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

SFLR (A19-11) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

SRR (A19-22) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

SRH (A19-21) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

AST (A19-16) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

WA (A18 4) GND (A19 2 13)Below 2.0 IG switch ON, ABS warning light ON

WA (A18-4) - GND (A19-2,13)10 - 14 IG switch ON, ABS warning light OFF

STP (A18 12) GND (A19 2 13)Below 1.5 Stop light switch OFF

STP (A18-12) - GND (A19-2,13)8 - 14 Stop light switch ON

D/G (A18-11) - GND (A19-2,13) 10 - 14 IG switch ON, ABS warning light OFF

MT (A19-9) - GND (A19-2,13) Below 1.5 IG switch ON

Tc (A18-9) - GND (A19-2,13) 10 - 14 IG switch ON

Ts (A18-8) - GND (A19-2,13) 10 - 14 IG switch ON

FR+ (A19-3) - FR- (A19-14) AC generationIG switch ON

Slowly turn right front wheel

FL+ (A19-19) - FL- (A19-20) AC generationIG switch ON

Slowly turn left front wheel

RR+ (A18-1) - RR- (A18-7) AC generationIG switch ON

Slowly turn right rear wheel

RL+ (A18-3) - RL- (A18-10) AC generationIG switch ON

Slowly turn left rear wheel

W02803

123456789101112

12345678910111213141516171819202122

A21 A20

23242526


679Author: Date:

1997 SUPRA (RM502U)

Sport ABS (2JZ-GTE Engine):


IG1 (A20-13) - GND (A20-12,25) 10 - 14 IG switch ON

SR (A21-7) - R+ (A20-26) 10 - 14 IG switch ON, ABS warning light OFF

MR (A21-1) - R+ (A20-26) Below 1.0 IG switch ON

SFRH (A20-2) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SFRR (A20-1) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SFLH (A21-5) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SFLR (A21-6) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SRRH (A21-11) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SRRR (A21-12) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SRLH (A20-15) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

SRLR (A20-14) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

AST (A21-4) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

WA (A20 11) GND (A20 12 25)Below 2.0 IG switch ON, ABS warning light ON

WA (A20-11) - GND (A20-12,25)10 - 14 IG switch ON, ABS warning light OFF

STP (A20 5) GND (A20 12 25)Below 1.5 Stop light switch OFF

STP (A20-5) - GND (A20-12,25)8 - 14 Stop light switch ON

D/G (A20-24) - GND (A20-12,25) 10 - 14 IG switch ON, ABS warning light OFF

MT (A21-10) - GND (A20-12,25) Below 1.5 IG switch ON

Tc (A20-8) - GND (A20-12,25) 10 - 14 IG switch ON

Ts (A20-21) - GND (A20-12,25) 10 - 14 IG switch ON

FR+ (A21-3) - FR- (A21-9) AC generationIG switch ON

Slowly turn right front wheel

FL+ (A21-8) - FL- (A21-2) AC generationIG switch ON

Slowly turn left front wheel

RR+ (A20-10) - RR- (A20-23) AC generationIG switch ON

Slowly turn right rear wheel

RL+ (A20-22) - RL- (A20-9) AC generationIG switch ON

Slowly turn left rear wheel

FRO (A20-7) - GND (A20-12,25) Pulse generation Vehicle driving at about 30 km/h (19 mph)

FLO (A20-20) - GND (A20-12,25) Pulse generation Vehicle driving at about 30 km/h (19 mph)

RRO (A20-6) - GND (A20-12,25) Pulse generation Vehicle driving at about 30 km/h (19 mph)

RLO (A20-19) - GND (A20-12,25) Pulse generation Vehicle driving at about 30 km/h (19 mph)

GL1 (A20-4) - GND (A20-12,25) 0.5 - 4.5 V IG switch ON

GL2 (A20-16) - GND (A20-12,25) 0.5 - 4.5 V IG switch ON

VGS (A20-3) - GND (A20-12,25) 4.5 - 5.5 V IG switch ON

DI4VA-01


680Author: Date:

1997 SUPRA (RM502U)

PROBLEM SYMPTOMS TABLEIf a normal code is displayed during the DTC check but the problem still occurs, check the circuits for eachproblem symptom in the order given in the table below and proceed to the relevant troubleshooting page.NOTICE:When removing the ECU, turn the IG switch OFF.

Symptoms Inspection Circuit See page

ABS does not operate.

Only when 1. - 4. are all normal and the problem is still occurring, replace the ABS

ECU.

1. Check the DTC, reconfirming that the normal code is output.

2. IG power source circuit.

3. Speed sensor circuit.

4. Check the ABS actuator with a checker.

If abnormal, check the hydraulic circuit for leakage (See page DI-498 ).

DI-442

DI-475

DI-469

BR-66 or XXX

ABS does not operate

efficiently.

Only when 1. - 4. are all normal and the problem is still occurring, replace the ABS

ECU.



3. Stop light switch circuit.

4. Check the ABS actuator with a checker.

If abnormal, check the hydraulic circuit for leakage (See page DI-498 ).

DI-442

DI-469

DI-482

BR-66 or BR-66

ABS warning light

abnormal.

1. ABS warning light circuit.

2. ABS ECU.

DI-488

DTC check cannot be done.

Only when 1. and 2. are all normal and the problem is still occurring, replace the

ABS ECU.

1. ABS warning light circuit.

2. Tc terminal circuit.

DI-488

DI-494

Speed sensor signal check

cannot be done.

1. Ts terminal circuit.

2. ABS ECU.

DI-496 XXX

DI4VB-01


681Author: Date:

1997 SUPRA (RM502U)

CIRCUIT INSPECTION

DTC 11, 12 ABS Solenoid Relay Circuit

CIRCUIT DESCRIPTIONThis relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check isOK, the relay goes on.

DTC No. DTC Detecting Condition Trouble Area

11

Conditions (1) and (2) continue for 0.2 sec. or more:

(1) ABS solenoid relay terminal (SR)

voltage: Below 1.5V

(2) Solenoid relay monitor terminal (AST)

voltage: 0 V

ABS solenoid relay

Open or short in ABS solenoid relay circuit

12


(1) ABS solenoid relay terminal (SR)

voltage: Battery positive voltage

(2) Solenoid relay monitor terminal (AST)


ABS solenoid relay

B+ short in ABS solenoid relay circuit

Fail safe function:If trouble occurs in the ABS solenoid relay circuit, the ECU cuts off current to the ABS solenoid relay andprohibits ABS control.

F02626

F02627 F02628

R/BNo.2

Battery

B

W-B

W-B

W-B

EA

A6

A6 A6

A6

A6

A9A8

A9

A9

A8 A8

A8

A9

IB6

IB6

IB6

A19

A19

A19

2A1

ALT

1

2

2

AB

S N

o.1

2

R R 1

2

6

ABS Control Relay 4

3

1

SolenoidRelay

DLC1

L-B L-B

V-W V-W

V V 7

8

18

ABS ECU

MR

R+

SR

AST

MT

16

9A19

A19

Y-G

G-W

2

13

1

6

5IB6

IB6

Y-G

G-W

5

3

ABS Actuator

ABS ECU

5

4

2

2

L

L-W

MotorRelay

R/BNo.2 A

BS

No.

1A

LT

2A1

1

1

12

22

Battery

B

RR/B No.5

ABS SolenoidRelay

W-B

5

5

5 5

5

5

1

2

3 5

4

6

DLC1

L-B L-B

V-W V-W

IB6

IB6

6

5

1

13

IB6

A21

A20

7

26

A214Y-G Y-GA6

5

ABS ECU

L-W

A64

ABS Actuator

EA

SR

R+

ABS ECU

2JZ-GE Engine (NORMAL ABS):

2JZ-GTE Engine (SPORT ABS):

R

AST


682Author: Date:

1997 SUPRA (RM502U)

WIRING DIAGRAM

F02629

F02630 F02631

LOCK

A9

(+)

(-)

W02799

ABS SolenoidRelay

ABSActuator

ECU

A9

A6 A6

A6 A6

A19

16

5

4

5

4

5


683Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURE (2JZ-GE Engine)

1 Check voltage between terminals A9 - 2 and A9 - 6 of ABS control (solenoid)relay connector.

PREPARATION:Disconnect the ABS control (solenoid) relay connector.CHECK:Measure voltage between terminals A9 - 2 and A9 - 6 of ABScontrol (solenoid) relay harness side connector.OK:

Voltage: 10 - 14 V

NG Check and repair harness or connector.

OK

2 Check continuity between terminal A9 - 5 of ABS control (solenoid) relay con-nector and terminal A19 - 16 of ABS ECU.

CHECK:Check continuity between terminal A9 - 5 of ABS control (sole-noid) relay connector and terminal A19 - 16 of ABS ECU.OK:

ContinuityHINT:There is a resistance of 26 ∼ 40 Ω between terminals A6 - 4 andA6 - 5 of ABS actuator.

NG Repair or replace harness or ABS actuator.

OK

F03349

F02634F02635

Open

Continuity

ContinuityA8

A8 A9

Open

(+)(-)


684Author: Date:

1997 SUPRA (RM502U)

3 Check ABS control (solenoid) relay.

CHECK:Check continuity between each terminal of ABS control (sole-noid) relay.OK:

Terminals A9 - 1 and A8 - 3 Continuity (Reference value 80 Ω)

Terminals A9 - 5 and A9 - 6 Continuity

Terminals A9 - 2 and A9 - 5 Open

CHECK:(a) Apply battery voltage between terminals A9 - 1 and A8

- 3.(b) Check continuity between each terminal of ABS control

(solenoid) relay.OK:



NG Replace ABS control relay.

OK

4 Check for open and short in harness and connector between ABS control(solenoid) relay and ABS ECU (See page IN-28 ).

NG Repair or replace harness or connector.

OK

If the same code is still output a after the DTC is deleted, check the contact condition of each con-nection.If the connections are normal, the ECU may be defective.

F02629

F02636 F02637

LOCK

R/B No.5

(-) (+)


685Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURE (2JZ-GTE Engine)

1 Check voltage between terminals 1 and 2 of R/B No.5 (for ABS solenoid relay).

PREPARATION:Remove ABS solenoid relay from R/B No.5.CHECK:Measure voltage between terminals 1 and 2 of R/B No.5 (forABS solenoid relay).OK:

Voltage: 10 - 14 V


OK

F02638

ABS SolenoidRelay

ABSActuator

ECU

A6 A6

A6 A6

A215

4

3

4

5

4


686Author: Date:

1997 SUPRA (RM502U)

2 Check continuity between terminal 3 of R/B No.5 (for ABS solenoid relay) andterminal A21 - 4 of ABS ECU.

CHECK:Check continuity between terminal 3 of R/B No.5 (for ABS sole-noid relay) and terminal A21 - 4 of ABS ECU.OK:



OK

F02639

F02640

F02641 F02642

3 2 1

456

OpenContinuity

ContinuityContinuity

Open

(+) (-)


687Author: Date:

1997 SUPRA (RM502U)

3 Check ABS solenoid relay.

PREPARATION:Remove solenoid relay from R/B No.5.CHECK:Check continuity between each terminal of ABS solenoid relay.OK:

Terminals 4 and 6 Continuity (Reference value 80 Ω)

Terminals 2 and 3 Continuity

Terminals 1 and 3 Open

CHECK:(a) Apply battery voltage between terminals 4 and 6.(b) Check continuity between each terminal of ABS solenoid

relay.OK:




OK

4 Check for open and short in harness and connector between ABS solenoid relayand ABS ECU (See page IN-28 ).


OK

If the same code is still output after the DTC is deleted, check the contact condition of each con-nection.If the connections are normal, the ECU may be defective.


694Author: Date:

1997 SUPRA (RM502U)

DTC 21, 22, 23, 24 ABS Actuator Solenoid Circuit

CIRCUIT DESCRIPTIONThis solenoid goes on when signals are received from the ECU and controls the fluid pressure acting on thebrake cylinders, thus controlling the braking force.


21

Conditions (1) through (3) continue for 0.05 sec. or more:

(1) ABS solenoid relay terminal (SR) voltage:

Below 1.5V

(2) Voltage of ABS ECU terminal AST:

Battery positive voltage

(3) When power transistor of ECU is ON, voltage of terminal

SFR is 0 V or battery positive voltage.

ABS actuator

Open or short in SFR circuit

22



Below 1.5V




SFL is 0 V or battery positive voltage.

ABS actuator

Open or short in SFL circuit

23



Below 1.5V




SRH (SRRH) or SRR (SRRR) is 0 V or battery positive volt-

age.

ABS actuator

Open or short in SRH (SRRH) or SRR (SRRR) circuit

24*



Below 1.5V




SRLH or SRLR is 0 V or battery positive voltage.

ABS actuator

Open or short in SRLH or SRLR circuit

Fail safe function:If trouble occurs in the ABS actuator solenoid circuit, the ECU cuts off current to the ABS solenoid relay andprohibits ABS control.*: SPORT ABS (2JZ-GTE Engine) only

DI4VD-01

F03320

F03321 F03322

R/BNo.2

Battery

B

W-B

EA

A6

A7

A6

A9

A9

A8

A19

2A1

ALT

1

2

2AB

S N

o.1

2

R R1

2

6

DLC1L-W

ABS ECU

A19

A19IB6Y-G

ABS ECU

4

R/BNo.2

AB

S N

o.1

1

1

22

Battery

R/B No.2

5

12

4

IB5

A21

A20

A6EA


2

1

1

ABS ECU

6

IB6

A21

R

ABS Control Relay

MotorRelay

A7

A7

A7

A7

A7

A19

A19

A19

A19

IB5

IB5

IB5

IB5

IB5

IB5

ABS Actuator

A9

SolenoidRelay

5ABS PumpMotor

P

P-L

Y

Y-R

B-Y

B-R

Y-G

P

P-L

Y

Y-R

B-Y

B-R5

1

5

6

2

8

7

5

5

8

7

9

4

3 1

4

11

10

22

21

16

SFLR

Monitor

SFLH

SFRR

SFRH

SRR

SRH

AST

5

5

53

5

5

5

ABS ECU

R


W-B

A64L-W

ALT

2A

B

ABS Actuator

Monitor

A20

A21

A21

A20

A20

A21

IB5

IB5

IB5

IB5

IB5

IB5

IB5

Y Y

Y-R Y-R

B-Y B-Y

B-R B-R

P P

P-L P-L

P-B P-B

R-L R-L

Y-G Y-G

A7

A7

A7

A7

A7

A7

A7

A7

1

DLC1

1

15

5

5

5

52

2

6

6

6

4

4

4

8

8

3

3

7

7

9

10

11

12

15

14

ABS SolenoidRelay

SFRH

SFRR

SFLH

SFLR

SRRH

SRRR

SRLH

SRLR

AST


695Author: Date:

1997 SUPRA (RM502U)

WIRING DIAGRAM

F03323

1 2 3 45 6 7 8

4

A6 A6


696Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURE

1 Check ABS actuator solenoid.

CHECK:NORMAL ABS (2JZ-GE Engine):Check continuity between terminal A6 - 4 and A7 - 1, 2, 5, 6,7, 8 of ABS actuator connector.SPORT ABS (2JZ-GTE Engine):Check continuity between terminal A6 - 4 and A7 - 1, 2, 3, 4,5, 6, 7, 8 of ABS actuator connector.OK:

ContinuityHINT:Resistance of each of the solenoids SFRH, SFLH, SRRH andSRLH is 5.0 Ω.Resistance of each of the solenoids SFRR, SFLR, SRRR andSRLR is 2.2 Ω.

NG Replace ABS actuator.

OK

2 Check for open and short in harness and connector between ABS ECU and ac-tuator (See page IN-28 ).


OK



688Author: Date:

1997 SUPRA (RM502U)

DTC 13, 14 ABS Motor Relay Circuit

CIRCUIT DESCRIPTIONThis ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switchesthe motor relay ON and operates the ABS pump motor.


13


(1) ABS motor relay terminal (MR)

voltage: Below 1.5V

(2) Motor relay monitor terminal (MT)

voltage: 0 V

ABS motor relay

Open or short in ABS motor relay circuit

14

Conditions (1) and (2) continue for 4 sec. or more:

(1) ABS motor relay terminal (MR)


(2) Motor relay monitor terminal (MT)


ABS motor relay

B+ short in ABS motor relay circuit

Fail safe function:If trouble occurs in the ABS motor relay circuit, the ECU cuts off the current to the ABS solenoid relay andprohibits ABS control.

DI4VC-01

F02626

F02643 F02644

R/BNo.2

Battery

B

W-B

W-B

W-B

EA

A6

A6 A6

A6

A6

A9A8

A9

A9

A8 A8

A8

A9

IB6

IB6

IB6

A19

A19

A19

2A1

ALT

1

2

2

AB

S N

o.1

2

R R 1

2

6

ABS Control Relay 4

3

1

SolenoidRelay

DLC1

L-B L-B

V-W V-W

V V7

8

18

ABS ECU

MR

R+

SR

AST

MT

16

9A19

A19

Y-G

G-W

2

13

1

6

5IB6

IB6

Y-G

G-W

5

3

ABS Actuator

ABS ECU

5

4

2

2

L

L-W

MotorRelay

R/BNo.2

AB

S N

o.1

ALT

1

1

2

2

Battery

B

R/B No.5

5

5

5

1

2

3

4

V-W V-W

IB6

IB6

6

2

13A21

A2026

A6

A6

ABS Pump MotorEA

MR

R+



R 5

2

L

W-B A6

1

3

1

ABS ECU

G-W G-W6

IB6 A21

10 MT

ABS Motor Relay

V V

R


689Author: Date:

1997 SUPRA (RM502U)

WIRING DIAGRAM

F02629

F02645 F02646

LOCK

A8

W02801

ABS SolenoidRelay

ABSActuator

ECU

A8

A6 A6

A6 A6

A193

9

2 2

2


690Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURE (2JZ-GE Engine)

1 Check voltage between terminal A8 - 1 of ABS control (motor) relay connectorand body ground.

PREPARATION:Disconnect the ABS control (motor) relay connector.CHECK:Measure voltage between terminal A8 - 1 of ABS control (mo-tor) relay connector and body ground.OK:

Voltage: 10 - 14 V


OK

2 Check continuity between terminal A8 - 2 of ABS control (motor) relay connectorand terminal A19 - 9 of ABS ECU.

CHECK:Check continuity between terminal A8 - 2 of ABS control (mo-tor) relay connector and terminal A19 - 9 of ABS ECU.OK:



OK

F02648

Open

Continuity

ContinuityA8

A8 A9

A9

1

34

2

1

34

2


691Author: Date:

1997 SUPRA (RM502U)

3 Check ABS control (motor) relay.

CHECK:Check continuity between each terminal of ABS control (motor)relay.OK:



CHECK:(a) Apply battery voltage between terminals A8 - 3 and A8

- 4.(b) Check continuity between terminals of ABS control (mo-

tor) relay.OK:



OK

4 Check for open and short in harness and connector between ABS motor relayand ABS ECU (See page IN-28 ).


OK


F02629

F02649 F02650

LOCK

R/B No.5

(+)(-)

F03315

ABS SolenoidRelay

ABSActuator

ECU

A6 A6

A6 A6

A21

2

22

3

10


692Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURE (2JZ-GTE Engine)

1 Check voltage between terminal 1 of R/B No.5 (for ABS motor relay) and bodyground.

PREPARATION:Remove ABS motor relay from R/B No.5.CHECK:Measure voltage between terminal 1 of R/B No.5 (for ABS mo-tor relay) and body ground.OK:

Voltage: 10 - 14 V


OK

2 Check continuity between terminal 2 of R/B No.5 (for ABS motor relay) and termi-nal A21 - 10 of ABS ECU.

CHECK:Check continuity between terminal 2 of R/B No.5 (for ABS mo-tor relay) and terminal A21 - 10 of ABS ECU.OK:



OK

F03316

F03317

F03318F03319

12

34

Open

Continuity

Continuity

(-) (+)


693Author: Date:

1997 SUPRA (RM502U)

3 Check ABS motor relay.

PREPARATION:Remove motor relay from R/B No.5.CHECK:Check continuity between each terminal of motor relay.OK:



CHECK:(a) Apply battery voltage between terminals 3 and 4.(b) Check continuity between terminals.OK:


NG Replace ABS motor relay.

OK

4 Check for open and short in harness and connector between ABS motor relayand ABS ECU (See page IN-28 ).


OK


BR3583BR3582 F00010

Rotor Speed Sensor

CoilN S Magnet

To ECU

Low SpeedHigh Speed

+V

-V


697Author: Date:

1997 SUPRA (RM502U)

DTC 31, 32, 33, 34 Speed Sensor Circuit

CIRCUIT DESCRIPTIONThe speed sensor detects the wheel speed and sends the ap-propriate signals to the ECU. These signals are used to controlthe ABS control system. The front and rear rotors each have 48serrations.When the rotos rotate, the magnetic field emitted by the perma-nent magnet in the speed sensor generates an AC voltage.Since the frequency of this AC voltage changes in direct propor-tion to the speed of the rotor, the frequency is used by the ECUto detect the speed of each wheel.


31,32,33,34

Detection of any of conditions (1) through (3):

(1) At vehicle speed of 10 km/h (6 mph) or more, pulses are

not input for 15 sec.

(2) Momentary interruption of the vehicle speed sensor signal

occurs at least 7 times in the time between switching the igni-

tion switch ON and switching it OFF.

(3) Abnormal fluctuation of speed sensor signals with the ve-

hicle speed 20 km/h (12 mph) or more.


Open or short in each speed sensor circuit

Sensor rotor

HINT:DTC No.31 is for the right front speed sensor.DTC No.32 is for the left front speed sensor.DTC No.33 is for the right rear speed sensor.DTC No.34 is for the left rear speed sensor.Fail safe function:If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS solenoid relay and prohibitsABS control.

DI4VE-01

W02989

IB5

IB5

IB2

IB2

IC2

IC2

A19 A21

8

Right FrontSpeed Sensor

2

1L

R

EA

3

14 9

19 8

220

1 10

7 23

3 22

10 9

FR+

FR-

ABS ECU

5V

FL+

FL-

RR+

RR-

RL+

RL-

R

L

W

B

V

LG

1

2

4

5

L

P

3

W

B

V

LG

2

2

2

1

1

1

Left FrontSpeed Sensor

Right RearSpeed Sensor

Left RearSpeed Sensor

*1

3*2

A19 A21

A19 A21

A19 A21

A18 A20

A18 A20

A18 A20

A18 A20


698Author: Date:

1997 SUPRA (RM502U)

WIRING DIAGRAM

*1: NORMAL ABS (2JZ-GE Engine)*2: SPORT ABS (2JZ-GTE Engine)

F02629

F03325 F03327

LOCK

2 1


699Author: Date:

1997 SUPRA (RM502U)


1 Check speed sensor.

FrontPREPARATION:(a) Remove front fender splash shield.(b) Disconnect speed sensor connector.CHECK:Measure resistance between terminals 1 and 2 of speed sensorconnector.OK:

Resistance: 0.6 - 2.5 k ΩCHECK:Measure resistance between terminals 1 and 2 of speed sensorconnector and body ground.OK:

Resistance: 1 M Ω or higherCHECK:Check the sensor connector.OK:

(1) There is not play on the connector connectingpart.(2) Connectors are connected each other securely.

F02629

F03326 F03328

LOCK

1 2


700Author: Date:

1997 SUPRA (RM502U)

RearPREPARATION:(a) Remove rear, seat cushion, seat back and quarter trim

panel.(b) Disconnect speed sensor connector.CHECK:Measure resistance between terminals 1 and 2 of speed sensorconnector.OK:


Resistance: 1 M Ω or higherCHECK:Check the sensor connector.OK:

(1) There is not play on the connector connectingpart.(2) Connectors are connected each other securely.

NG Replace speed sensor.

NOTICE:Check the speed sensor signal last (See page DI-442 ).

OK

2 Check for open and short in harness and connector between each speed sensorand ABS ECU (See page IN-28 ).


OK

F03329

R00948


701Author: Date:

1997 SUPRA (RM502U)

3 Check sensor rotor and sensor installation.

FrontPREPARATION:Remove front speed sensor rotor (See page SA-12 ).CHECK:Check sensor rotor serrations.OK:

No scratches, missing teeth or foreign objects.CHECK:Check the front speed sensor installation.OK:

The installation bolt is tightened properly and there isno clearance between sensor and steering knuckle.

CHECK:Check the sensor tip.OK:

No scratches or foreign objects on the sensor tip.RearPREPARATION:Remove the drive shaft (See page SA-43 ).CHECK:Check the sensor rotor serrations.OK:

No scratches or missing teeth.

BR3795

OK NG


702Author: Date:

1997 SUPRA (RM502U)

CHECK:Check the rear speed sensor installation.OK:

The installation bolt is tightened properly and there isno clearance between the sensor and rear axle carri-er.

CHECK:Check the sensor tip.OK:

No scratches or foreign objects on the sensor tip.

NG Replace speed sensor and grease or rotor andgrease.


OK

Check and replace ABS ECU.

F03330

Battery

B

R/B No.2ALT

2 2 2 2AM1

R/B No.2W

R/B No.1W

2

IG Switch J/B No.1ABS ECU

IG1

GND1

GND2

ECU IG4 4 4 5 13

B-Y

1B 1J 1J 1K A18 A202 13

*1

*2

A20

A20

A19

A19

2 12

13 25

W-B

W-B

W-BW-B

IG IE

W-B

*2

NORMAL ABS (2JZ-GE Engine)SPORT ABS (2JZ-GTE Engine)

*1:

*2:

W


703Author: Date:

1997 SUPRA (RM502U)

DTC 41 IG Power Source Circuit

CIRCUIT DESCRIPTIONThis is the power source for the ECU, hence the CPU and the actuators.


41Voltage at ECU terminal IG1 is less than 9.5 V for more than

10 sec. while vehicle speed is 3 km/h (1.9 mph) or more.

Battery

IC regulator


Fail safe function:If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibitsABS control.

WIRING DIAGRAM

DI4VF-01

F02629

F03331

F03332F03333

ON

NORMAL ABS(2JZ-GE Enegine):

SPORT ABS(2JZ-GTE Enegine):

IG1 GND

GNDIG1

(+)

(-)

(+)

(-)


704Author: Date:

1997 SUPRA (RM502U)


1 Check battery positive voltage.

OK:Voltage: 10 - 14 V

NG Check and repair the charging system.

OK

2 Check voltage between terminals IG1 and GND of ABS ECU connector.

PREPARATION:Remove ABS ECU with connectors still connected.CHECK:(a) Turn ignition switch ON.(b) Measure voltage between terminals IG1 and GND of ABS

ECU connector.OK:

Voltage: 10 - 14 V

OK Check and replace ABS ECU.

NG

F02629

F03334

F03335 F03336


SPORT ABS (2JZ-GTE Engine):

LOCK

GND

(+)

(-)

(+)

(-)

GND

GND

GND


705Author: Date:

1997 SUPRA (RM502U)

3 Check continuity between terminal GND of ABS ECU connector and bodyground.

CHECK:Measure resistance between terminals GND of ABS ECU con-nector and body ground.OK:

Resistance: 1 Ω or less


OK

F03337

ECU IG

J/B No.1


706Author: Date:

1997 SUPRA (RM502U)

4 Check ECU-IG fuse.

PREPARATION:Remove ECU-IG fuse from J/B No.1.CHECK:Check continuity of ECU-IG fuse.OK:

Continuity

NG Check for short in all the harness and compo-nents connected to ECU-IG fuse(See attached wiring diagram).

OK

Check for open in harness and connector be-tween ABS ECU and battery(See page IN-28 ).


707Author: Date:

1997 SUPRA (RM502U)

DTC 43, 45 Malfunction is Deceleration Sensor(SPORT ABS (2JZ-GTE Engine) only)

CIRCUIT DESCRIPTIONDTC No. DTC Detecting Condition Trouble Area

43

Either of the following (1) or (2) is detected:

(1) Input from the deceleration sensor does not change at one

cycle (0 km/h → more than 30km/h → 0 km/h) for 16 times

continuously.

(2) When the brake pedal is not depressed at vehicle speed of

5 km/h or more, forward and backward G (more than 0.4 G) is

detected for 30 seconds or more.

Deceleration sensor


45

At vehicle speed of 30 km/h or more, the deceleration sensor

output and vehicle acceleration from wheel speed remain ab-

normally different for 60 seconds or more.

Deceleration sensor



1 Check deceleration sensor (See page DI-442 ).

NG Replace deceleration sensor.

OK

2 Check for open or short in harness and connector between sensor and ABS ECU(See page IN-28 ).

NG Repair or replace harness and connector.

OK


DI4VG-01

F03338

Deceleration sensor

3

5

1

2

A23

A23

A23

A23

B

W-B

W

R

G

W-B

IG IE

A20

A20

A20

A20

3

16

4

17

VGS

GL2

GL1

GGND

ABS ECU


708Author: Date:

1997 SUPRA (RM502U)

DTC 44 Deceleration Sensor Circuit(SPORT ABS (2JZ-GTE Engine) only)

CIRCUIT DESCRIPTIONThis sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-tions abnormally, the ABS warning light comes on but the ABS still operates.


44

Either of the following (1), (2) or (3) is detected:

(1) IG switch ON and output voltage of GL1 or GL2 remains

0.5 V or less or 4.5 V or more for more than 1.2 sec.

(2) At vehicle speed of 0 km/h, outputs of GL1 and GL2 re-

mains abnormally different for 60 sec. or more

(3) IG switch ON and VGS 4.4 V, VGS 5.5 V continues

for 1.2 sec. or more.

Deceleration sensor

Open or short in deceleration sensor circuit

WIRING DIAGRAM

DI4VH-01

F02629

F03339 F03340

ON

GL1 VGS

GL2

(+)

(-)


709Author: Date:

1997 SUPRA (RM502U)


1 Check for open and short in harness and connector between sensor and ABSECU (See page IN-28 ).


OK

2 Check voltage between terminals GL1, GL2, VGS of ECU and body ground.

PREPARATION:(a) Remove ABS ECU with connectors still connected.(b) Disconnect sensor connector.(c) Turn the ignition switch ON.CHECK:Measure voltage between terminals GL1, GL2, VGS of ECUand body ground.OK:

Voltage:GL1, GL2: 0.5 - 4.5 VVGS: 4.5 - 5.5 V

NG Check and replace ABS ECU.

OK

Check and replace deceleration sensor.

F03341

R/B No.2 J/B No.1Stop LightSwitch

ABS ECU

12 5

LightFailureSensor

Stop Light

J/BNo.1

1

10

IH

IC

A18 A22

*1 *2

G-W G-W

G-W12

WSTOP2 101B 1IW-LPOWER

2 2W

2

2A

ALT R/B No.2

B

Battery

NORMAL ABS (2JZ-GE Engine)SPORT ABS (2JS-GTE Engine)

*1:*2:

1


710Author: Date:

1997 SUPRA (RM502U)

DTC 49 Stop Light Switch Circuit

CIRCUIT DESCRIPTIONThis stop light switch senses whether the brake pedal is depressed or released, and sends a signal to theECU.


49 1.2 - 1.7 V of STP voltage is continued for 0.3 sec. or more. Open in stop light circuit

WIRING DIAGRAM


1 Check operation of stop light.

CHECK:Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.

NG Replace stop light bulb.

OK

DI4VI-01

F03342

F03343 F03344


SPORT ABS (2JZ-GTE Engine):

V(+)

(-)

(+)

(-)

STP

STP


711Author: Date:

1997 SUPRA (RM502U)

2 Check voltage between terminal STP of ABS ECU and body ground.

PREPARATION:Remove ABS ECU with connectors still connected.CHECK:Measure voltage between terminal STP of ABS ECU and bodyground when brake pedal is depressed.OK:

Voltage: 8 - 14 V

OK Proceed to next circuit inspection shown onproblem symptoms chart (See page DI-452 ).

NG

3 Check for open in harness and connector between ABS ECU and stop lightswitch (See page IN-28 ).


OK



712Author: Date:

1997 SUPRA (RM502U)

DTC 51 ABS Pump Motor Lock


51 Pump motor is not operating normally during initial check. ABS pump motor

Fail safe function:If trouble occurs in the ABS pump motor, the ECU cuts off the current to the ABS solenoid relay and prohibitsABS control.

WIRING DIAGRAMSee page DI-460 .

INSPECTION PROCEDURESee inspection of ABS actuator (See page BR-66 or BR-66 ).

DI4VJ-01

F03345

R/B No.2ABS ECU*1 *2

W2 1B2 2

B

Battery


*1:*2:

ALTW R/B No.2 J/B No.1

2AM1 W

1J4 4 2

IG Switch

4

B-Y J/B No.1

1J 1KECU-IG5 13

A18 A202 13

2 12

13 25

IG 1

GND1

GND2

A20

A20

A19

A19

W-B

W-B

W-B

W-B

W-B

*2

IEIG


713Author: Date:

1997 SUPRA (RM502U)

DTC Always ON Malfunction in ECU IG Power SourceCircuit

CIRCUIT DESCRIPTIONThis is the power source for the ECU, hence the CPU, and the actuators.


Always ONVoltage of ECU terminal IG1 remains at more than 17 V for 1

sec. or more.

Battery

IC regulator


ECU

Fail safe function:If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibitsABS control.

WIRING DIAGRAM

DI4VK-01


714Author: Date:

1997 SUPRA (RM502U)


1 Is DTC output?

Check DTC on page DI-442 .

YES Repair circuit indicated by the code output.

NO

2 Is normal code displayed?

YES Check ABS solenoid relay. Check for short inharness and connector between ABS solenoidrelay and DLC1 (See page IN-28 ).

NO

3 Is ABS warning light go off?

YES Check for open or short in harness and conec-tor between ECU-IG Fuse and ECU(See page IN-28 ).

NO


PREPARATION:Start the engine.CHECK:Check the battery positive voltage.OK:

Voltage: 10 - 16 V


OK


715Author: Date:

1997 SUPRA (RM502U)

5 Check ABS warning light.

PREPARATION:(a) Turn the ignition switch OFF.(b) Disconnect the conector from the ABS ECU.(c) Turn the ignition switch ON.CHECK:Check the ABS warning light goes off.

OK Check and replace ABS ECU.

NG

Check for short in harness and connector between combination meter and ABS ECU, combina-tion meter and DLC1 (See page IN-28 ).

F03346

F03347 F03348



BatteryABS Control Relay J/B No.1

(MotorRelay)

(SolenoidRelay)

W-B

1

26

A9

4

3

14

A9B-R

EA16

23B-R

22DLC1

Short PinL 16

IJ1 A184L L

L

IF212

L 4

2ABSWarningLight

YGAUGE

ABS ECU

1J 1E5 12

2 5ABS Actuator

ABS ECU

12 V

WA

EA

BatteryR/B No.5

ABSSolenoid Relay

1 5

5

5 5

5

526

4

53W-B

EAABS Actuator

B-R EA16

23B-R

Short Pin

DLC122

L 16IJ1 L

L

L11A20

WA

12 V

ABS ECU

ABSWarningLight

L 4

IF212

2

YGAUGE

J/B No.1

1J 1E125

ABS & TRACECU


716Author: Date:

1997 SUPRA (RM502U)

ABS Warning Light Circuit

CIRCUIT DESCRIPTIONIf the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. Atthis time, the ECU records a DTC in memory.After removing the short pin of the DLC1, connect terminals Tc and E1 of the DLC1 or DLC2 to make theABS warning light to blink and output the DTC.

WIRING DIAGRAM

DI4VL-01

F02629

F03349 F03350

LOCK

Open

ContinuityA8 A9

Continuity

F02629

F03351F03352

Open

Continuity

A8 A9

(+) (-)

LOCK


717Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURE2JZ-GE Engine:Troubleshooting in accordance with the chart below for each trouble symptom.

ABS warning light does not light up Go to step 1

ABS warning light remains on Go to step 3


See Combination Meter Troubleshooting on page BE-2 .

NG Replace bulb or combination meter assembly.

OK

2 Check ABS control (solenoid) relay.

PREPARATION:Disconnect the connectors from ABS control (solenoid) relay.CHECK:Check continuity between each terminal of ABS control (sole-noid) relay.OK:




CHECK:(a) Apply battery positive voltage between terminals A9 - 1

and A8 - 3.(b) Check continuity between each terminal of ABS solenoid

relay.OK:



F02629

F03353 F03354

LOCK

(+)

(-)

A9


718Author: Date:

1997 SUPRA (RM502U)

CHECK:Connect the test lead to terminal A9 - 4 and the lead toterminal A9 - 5. Check continuity between terminals.OK:

ContinuityIf there is no continuity, connect the test lead to terminal A9- 4 and the lead to terminal A9 - 5. Recheck continuity be-tween terminals.


OK

Repair or replace and check for open in harness and connector between DLC1 and ABS control(solenoid) relay and body ground (See page IN-28 ).

3 Is DTC output?



NO

4 Does ABS warning light go off if short pin is removed?

NO Check for short in harness and connector be-tween warning light and DLC1 and ECU (Seepage IN-28 ).

YES

F02629

F03355 F03356

LOCK

Open

Continuity

Continuity


719Author: Date:

1997 SUPRA (RM502U)

5 Check ABS control (solenoid) relay (See step No.2).


OK

Repair or replace and check for short in harness and connector between DLC1 and ABS control(solenoid) relay (See page IN-18 ).

2JZ-GTE Engine:Troubleshoot in accordance with the chart below for each trouble symptom.

ABS warning light does not light up Go to step 1

ABS warning light remains on Go to step 3


See combination meter troubleshooting on page BE-2 .

NG Replace bulb or combination meter assembly.

OK

2 Check ABS solenoid relay.

PREPARATION:Remove solenoid relay from R/B No.5.CHECK:Check continuity between each terminal of ABS solenoid relay.OK:




F02629

F03357 F03358

LOCK

Open

Continuity

(-) (+)

F02629

F03359 F03360

LOCK

(-) (+)

6 4

12


720Author: Date:

1997 SUPRA (RM502U)

CHECK:(a) Apply battery positive voltage between terminals 4 and 6.(b) Check continuity between each terminal of ABS solenoid

relay.OK:



CHECK:Connect the test lead to terminal 5 and the lead to terminal3. Check continuity between the terminals.OK:

ContinuityIf there is not continuity, connect the test lead to terminal 5and the lead to terminal 3. Recheck continuity between ter-minals.

NG Replace ABS solenoid relay.

OK

Repair or replace and check for open in harness and connector between DLC1 and ABS solenoidrelay and body ground (See page IN-28 ).

3 Is DTC output?



NO


721Author: Date:

1997 SUPRA (RM502U)

4 Does ABS warning light go off if short pin is removed?

NO Check for short in harness and connector be-tween warning light and DLC1 and ECU (Seepage IN-28 ).

YES

5 Check ABS solenoid relay (See step No.2).


OK

Repair or replace and check for short in harness and connector between DLC1 and ABS solenoidrelay (See page IN-28 ).

F03361

ABS ECU

12 V

TcA20A19

9 8*1 *2

RR

R

IF111

P-BII1

DLC1 R *121*2P-B

R *1*2

DLC2

11TcE1

3BR

BR

BR

ED

IJ118

BR TcE13 4


*1:*2:

S−17−1 Iei−23−1−A F00041

DLC2 DLC1E1 Tc

E1Tc


722Author: Date:

1997 SUPRA (RM502U)

Tc Terminal Circuit

CIRCUIT DESCRIPTIONConnecting terminals Tc and E1 of the DLC1 or the DLC1 or the DLC2 causes the ECU to display the DTCby flashing the ABS warning light.

WIRING DIAGRAM


1 Check voltage between terminals Tc and E1 of DLC2 or DLC1.

PREPARATION:Turn ignition switch ON.CHECK:Measure voltage between terminals Tc and E1 of DLC2 orDLC1.OK:

Voltage: 10 - 14 V

OK If ABS warning light does not blink even after Tcand E1 are connected, the ECU may be defec-tive.

NG

DI4VM-01


723Author: Date:

1997 SUPRA (RM502U)

2 Check for open and short in harness and connector between ABS ECU andDLC2 or DLC1, DLC2 or DLC1 and body ground (See page IN-28 ).


OK


F03362

ABS ECU

Ts8*1 *2

IJ1

DLC12115BR

ED

TcE13 16


*1:*2:

Y Y

12 V

A18 A20

F00007lei-23-1-A

E1 Ts

DLC1


724Author: Date:

1997 SUPRA (RM502U)

Ts Terminal Circuit

CIRCUIT DESCRIPTIONThe sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected withthe DTC check.Connecting terminals Ts and E1 of the DLC1 in the engine compartment starts the check.

WIRING DIAGRAM


1 Check voltage between terminals Ts and E1 of DLC1.

PREPARATION:Turn ignition switch ON.CHECK:Measure voltage between terminals Ts and E1 of DLC1.OK:

Voltage: 10 - 14 V

OK If ABS warning light does not blink even after Tsand E1 are connected, the ECU may be defec-tive.

NG

DI4VN-01


725Author: Date:

1997 SUPRA (RM502U)

2 Check for open and short in harness and connector between ABS ECU andDLC1, DLC1 and body ground (See page IN-28 ).


OK


F03363


726Author: Date:

1997 SUPRA (RM502U)

Check for Fluid Leakage

Check for fluid leakage from actuators or hydraulic lines.

DI4VO-01

DI4VP-01


Customer Problem AnalysisP. DI-500

Check and Clear DTC (Precheck)P. DI-501

Items inside are titles of pages in this manual,with the page number in the bottom portion. Seethe pages for detailed explanations.

Problem Symptom Confirmation Symptom SimulationP. IN-18

Symptomdoes not occur

Symptomoccurs

DTC CheckP.DI-501

Sensor CheckCircuit Inspection

DTC ChartP. DI-503

Malfunction code

Problem Symptoms ChartP. DI-508


Normal code

Repair

Confirmation Test

End

1

2

3 4

5

6 7

89

10

11

Step 9: Diagnostic steps permitting the use of theTOYOTA hand-held tester.

P DI-509 - DI-553

-DIAGNOSTICS ABS & TRACTION CONTROL SYSTEMDI-499

727Author: Date:

1997 SUPRA (RM502U)

ABS & TRACTION CONTROL SYSTEMHOW TO PROCEED WITH TROUBLESHOOTINGTroubleshooting in accordance with the procedure on the following pages.

DI4VQ-01

TRAC Check SheetInspector’sName :

Customer’s Name

Date VehicleBrought In

Registration Year

Registration No.

Frame No.

Odometer Reading

/ /

/ /



/ /

Continuous Intermittent ( times a day)

DTC Check

1st Time

2nd Time



kmmiles

Check Item NormalMalfunctionIndicator Light Malfunction Code (Code )

TRAC does not operate. (Wheels spin when starting rapidly.)

Symptoms

TRAC OFF IndicatorLight Abnormal

SLIP IndicatorLight Abnormal

Remains ON Blinks Does not Light Up

Remains ON Does not Light Up

Remains ON Does not Light UpSnow IndicatorLight Abnormal

DI-500-DIAGNOSTICS ABS & TRACTION CONTROL SYSTEM

728Author: Date:

1997 SUPRA (RM502U)


DI4VR-01

W02267

F03365

ON

OFF

0.5sec.

1.5sec.

S−17−1 F02201 F03525

DLC2 DLC1E1

Tc TcE1


729Author: Date:

1997 SUPRA (RM502U)

PRE-CHECK1. DIAGNOSIS SYSTEM(a) Check the indicator.

When the ignition switch is turned ON, check that theTRAC OFF indicator light goes on, and when the engineis started, check that the TRAC OFF indicator light goesoff.

HINT:If the indicator check result is not normal, proceed to trouble-shooting for the TRAC OFF indicator light circuit (See page DI-547 ).

(b) Check the DTC.(1) Turn the ignition switch ON.

If the ECU stores DTC, the TRAC OFF indicator light blinks afterlighting up for 3 seconds.The blinking pattern is shown on the left.

(2) Using SST, connect terminals Tc and E1 of DLC2 orDLC1.

SST 09843-18020

R01346

Normal Code2 sec. 0.25

sec.0.25sec.

ON

OFF

Code 11 and 21

ON

OFF

0.5 sec.

2.5 sec.4.5 sec.1.5sec.

0.5 sec.

Code 11 Code 21

F03366

ECU-B

J/B No.1


730Author: Date:

1997 SUPRA (RM502U)

(3) Read the DTC from the TRAC OFF indicator light onthe combination meter.

HINT: If no code appears, inspect the diagnostic circuit or TRAC

OFF indicator light circuit (See page DI-553 or DI-547 ).

As an example, the blinking patterns for normal code andcodes 11 and 21 are shown on the left.(4) Codes are explained in the code table on page

DI-503 .(5) After completing the check, disconnect terminals Tc

and E1, and turn off the display.If 2 or more malfunctions are indicated at the same time, thelowest numbered DTC will be displayed 1st.

(c) Clear the DTC.(1) Remove the ECU-B fuse from the J/B No.1 for 10

sec. or more.(2) Install the ECU-B fuse.(3) Confirm that the TRAC OFF indicator light shows

the normal code.

DI4VS-01


731Author: Date:

1997 SUPRA (RM502U)

DIAGNOSTIC TROUBLE CODE CHARTHINT:Using SST 09843-18020, connect the terminals Tc and E1.If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For detailsof each code, turn to the page referred to under the ”See page” for the respective ”DTC No.” in the DTC chart.

DTC No.


11

(DI-509 )Throttle control relay circuit open

Throttle control relay

TRAC fuse

Wire harness and connector (throttle control relay circuit)

Throttle control ECU

12

(DI-509 )Throttle control relay circuit short




21

(DI-513 )Sub-throttle valve motor circuit open or short

Sub-throttle valve motor

Wire harness and connector (sub-throttle valve motor and

E01 circuit)


22

(DI-513 )Sub-throttle valve motor malfunction


Sub-throttle valve

Sub-throttle position sensor

Wire harness and connector (E1 circuit)


23

(DI-516 )Throttle body malfunction

Sub-throttle valve



24

(DI-519 )Sub-throttle position sensor leakage/sub-throttle valve stuck

Sub-throttle valve




31

(DI-522 )Throttle position sensor signal malfunction

Throttle position sensor

Wire harness and connector (throttle position senor and E1

circuit)


32

(DI-526 )Sub-throttle position sensor signal malfunction



Sub-throttle valve

Wire harness and connector (sub-throttle position senor and

E1 circuit)


41

(DI-530 )Engine revolution signal open or short

Wire harness and connector (NE circuit)

ECM


42

(DI-532 )ECM malfunction

Wire harness and connector (EFIF circuit)

ECM


43

(DI-534 )ECM communication circuit malfunction

Wire harness and connector (EFI+ and EFI- circuit)

ECM


51

(DI-535 )

Power source voltage down

(sub-throttle valve in a bad condition)

Wire harness and connector (+B and E01 circuit)



732Author: Date:

1997 SUPRA (RM502U)

52

(DI-535 )Power source voltage down

Battery

IC regulator



61

(DI-538 )Right front speed sensor circuit

62

(DI-538 )Left front speed sensor circuit Right front, left front, right rear and left rear speed sensor

Wire harness and connector (FRO, FLO, RRO and RLO

63

(DI-538 )Right rear speed sensor circuit


circuit)


64

(DI-538 )Left rear speed sensor circuit

71

(DI-542 )Emergency fuel cut (sub-throttle motor circuit malfunction)


S b th ttl l72

(DI-542 )Emergency fuel cut

Sub-throttle valve


81

(DI-545 )ABS ECU malfunction

Wire harness and connector (WA circuit)

ABS ECU


Always ONThrottle control ECU malfunction

TRAC OFF switch ONThrottle control ECU

DI4V

T-01

W02272

Rear Speed Sensor Rotor

SLIP Indicator Light TRAC OFF Indicator LightSNOW Indicator Light

Throttle Control Relay(TRAC Solenoid Relay)

TRAC OFFSwitch

SNOW Mode Switch

ABS ECU

ECM

Throttle Control ECU

DLC1Throttle Position Sensor

Sub-throttle Position Sensor


Sub-throttle Valve Motor

Front Speed Sensor


Rear Speed SensorDLC2Front Speed Sensor

-D

IAG

NO

ST

ICS

AB

S &

TR

AC

TIO

N C

ON

TR

OL S

YS

TE

MD

I-505

733Author:

Date:

1997 SU

PR

A (R

M502U

)

PA

RT

S LO

CAT

ION

DI7HK-01

R00463

13 12 11

26 25 24 23 22 21 20 19 18 17 16 15 14 16 15 14 13 12 11 10 9

1234567812345678910

Throttle Contrl ECUT15 T16


734Author: Date:

1997 SUPRA (RM502U)

TERMINALS OF ECU


BATT (T16-1) - E1 (T15-26) 9 - 14 Always

+B (T16-9) - E1 (T15-26) 9 - 14 IG switch ON, Engine stops

EFIB (T15-1) - E1 (T15-26) 9 - 14 IG switch ON, Engine stops

IDL1 (T15 4) E1 (T15 26)0 - 3 IG switch ON, Throttle valve fully closed

IDL1 (T15-4) - E1 (T15-26)9 - 14 IG switch ON, Throttle valve fully open

VTA1 (T15 6) E1 (T15 26)0.3 - 0.8 IG switch ON, Throttle valve fully closed

VTA1 (T15-6) - E1 (T15-26)3.2 - 4.9 IG switch ON, Throttle valve fully open

IDL2 (T15 3) E1 (T15 26)0 - 3 Engine running, Sub-throttle valve fully closed

IDL2 (T15-3) - E1 (T15-26)9 - 14 Engine running, Sub-throttle valve fully open

VTA2 (T15 19) E1 (T15 26)0.3 - 0.8 Engine running, Sub-throttle valve fully closed

VTA2 (T15-19) - E1 (T15-26)3.2 - 4.9 Engine running, Sub-throttle valve fully open

FRO (T16-16) - E1 (T15-26) Pulse generation Vehicle driving at about 30 km/h (19 mph)

FLO (T16-8) - E1 (T15-26) Pulse generation Vehicle driving at about 30 km/h (19 mph)

RRO (T16-15) - E1 (T15-26) Pulse generation Vehicle driving at about 30 km/h (19 mph)

RLO (T16-7) - E1 (T15-26) Pulse generation Vehicle driving at about 30 km/h (19 mph)

WT (T16 10) E1 (T15 26)0 - 3 IG switch ON, TRAC OFF indicator light ON

WT (T16-10) - E1 (T15-26)9 - 14 IG switch ON, TRAC OFF indicator light OFF

IND (T16 2) E1 (T15 26)0 - 3 IG switch ON, SLIP indicator light ON

IND (T16-2) - E1 (T15-26)9 - 14 IG switch ON, SLIP indicator light OFF

CSW (T16 6) E1 (T15 26)0 - 3 IG switch ON, TRAC OFF switch holded on pushing

CSW (T16-6) - E1 (T15-26)9 - 14 IG switch ON, TRAC OFF switch released

RLY+ (T16-4) - RLY- (T16-12) 9 - 14 IG switch ON

SIND (T16 11) E1 (T15 26)0 - 3 IG switch ON, SNOW indicator light ON

SIND (T16-11) - E1 (T15-26)9 - 14 IG switch ON, SNOW indicator light OFF

SNOW (T16 14) E1 (T15 26)0 - 3 IG switch ON, SNOW mode switch holded on pushing

SNOW (T16-14) - E1 (T15-26)9 - 14 IG switch ON, SNOW mode switch released

A (T15-12) - E01 (T15-13) Pulse generation Engine running, Throttle valve fully closed

A (T15-11) - E01 (T15-13) Pulse generation Engine running, Throttle valve fully closed

B (T15-25) - E01 (T15-13) Pulse generation Engine running, Throttle valve fully closed

B (T15-24) - E01 (T15-13) Pulse generation Engine running, Throttle valve fully closed

NE (T15-16) - E1 (T15-26) Pulse generation Idling

FAIL (T15 9) E1 (T15 26)Pulse generation IG switch ON (normal condition)

FAIL (T15-9) - E1 (T15-26)9 - 14 IG switch ON (abnormal condition)

EFIF (T15 17) E1 (T15 26)0 - 2 IG switch ON, ECM normal condition

EFIF (T15-17) - E1 (T15-26)4.5 - 5.5 IG switch ON, ECM abnormal condition


735Author: Date:

1997 SUPRA (RM502U)

EFI+ (T15-7) - E1 (T15-26) Pulse generation IG switch ON

EFI- (T15-20) - E1 (T15-26) Pulse generation IG switch ON

ETC+ (T15-8) - E1 (T15-26) Pulse generation IG switch ON

ETC- (T15-21) - E1 (T15-26) Pulse generation IG switch ON

TC (T16-3) - E1 (T15-26) 4.5 - 5.5 IG switch ON, Engine stops

WA (T16 5) E1 (T15 26)9 - 14 IG switch ON, ABS ECU normal condition

WA (T16-5) - E1 (T15-26)0 - 3 IG switch ON, ABS ECU abnormal condition

DI4VV-01


736Author: Date:

1997 SUPRA (RM502U)

PROBLEM SYMPTOMS TABLEIf a normal code is displayed during the DTC check but the problem still occurs, check the circuits for eachproblem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

Symptom Inspection Circuit See page

TRAC does not operate.

Only when inspection circuits for each problem symptom are all normal and the

problem is still occurring,replace the throttle control ECU.


2. Power source circuit.


DI-501

DI-535

DI-538

SLIP indicator light

abnormal.SLIP indicator light circuit. DI-550

SNOW indicator light

abnormal.

1. SNOW indicator light circuit.

2. SNOW made switch circuit.

DI-551

DI-551

TRAC OFF indicator light

abnormal.



1. TRAC OFF indicator light circuit.

2. TRAC OFF switch circuit.

DI-547

DI-547

DTC check cannot be done.



1. TRAC OFF indicator light circuit.

2. Tc terminal circuit.

DI-547

DI-553

DI4VW-01

F03368

Throttle ControlECU

R/B No.5


R/BNo.2

Battery

+B

RLY-

RLY+

E01

9

12

4

13BR

L-B

BR-B

L-R14

11

12L-B

L-Y L-R

BR-B

B

2

1 2A

5

42

1

3IB5 T16

T15

EC

5

1

6

5

5 IB5

IB5

T16

T16TR

AC


737Author: Date:

1997 SUPRA (RM502U)

CIRCUIT INSPECTION

DTC 11, 12 Throttle Control Relay Circuit


11Instead of throttle control relay is ON, voltage at +B of ECU

terminal does not output 4 V or more for 1 sec. or more.


TRAC fuse



12Instead of throttle control relay is OFF, voltage at +B of ECU

terminal outputs 4 V or more for 2 sec. or more.




WIRING DIAGRAM

F03369

R/B No.2

TRAC

F03370

BE6053

F06762

LOCK

R/B No.5

(-) (+)


738Author: Date:

1997 SUPRA (RM502U)


1 Check TRAC fuse.

PREPARATION:Remove TRAC fuse from R/B No.2.CHECK:Check continuity of TRAC fuse.OK:

Continuity

NG Check for short in all harness and componentsconnected to TRAC fuse.

OK

2 Check voltage between terminal 1 of R/B No.5 (for throttle control relay).

PREPARATION:Remove throttle control relay from P/B No.5.CHECK:Measure voltage between terminal 1 of R/B No.5 (for throttlecontrol relay).OK:

Voltage: 10 - 14 V


OK

F03372

F03373

F03374 F03375

3

6

1

4

Open

Continuity

Continuity3 1

4

6

13

6

4

-DIAGNOSTICS ABS & TRACTION CONTROL SYSTEMDI-51 1

739Author: Date:

1997 SUPRA (RM502U)

3 Check throttle control relay.

PREPARATION:Remove throttle control relay from R/B No.5CHECK:Check continuity between each terminal of throttle control relay.OK:



CHECK:(a) Apply battery voltage between terminals 4 and 6.(b) Check continuity between terminals.OK:


NG Replace throttle control relay.

OK


740Author: Date:

1997 SUPRA (RM502U)

4 Check for open and short in harness and connector between throttle controlrelay and throttle control ECU (See page IN-28 ).


OK


F03376

ECM

VTO2

IDL2

Sub-throttlePosition Sensor

39

E10

E9

63

GR-R

G-OT15

19

GR-RGR-R3

T15

26T15

BR

12V

VTA2

12V

12V

GE01

E01

B

B

A

A

12V

12V

12

T15

T15

25

T15

T15

23

T15

13

T15W-B

(Shielded)

L

Y

R

B

Sub- throttleValve Motor

6

4

3

1

2EDEC

IDL2

E1

11

24



741Author: Date:

1997 SUPRA (RM502U)

DTC 21, 22 Sub-Throttle Valve Motor Circuit


21 Sub-throttle valve motor circuit is open or short.


Wire harness and connector (sub-throttle valve motor and

E01 circuit)


22 In case the sub-throttle valve open angle is tilted.


Sub-throttle valve

Sub-throttle position senor



WIRING DIAGRAM

DI4VX-01

F03377

3

6 4

1

F03378

BE6653

F03379 F03380

ON

IDL2


742Author: Date:

1997 SUPRA (RM502U)


1 Check sub-throttle valve motor.

PREPARATION:Disconnect sub-throttle valve motor connector.CHECK:Check continuity between each terminal of sub-throttle valvemotor connector.OK:


Terminals 4 and 6

Continuity

(Reference value 0.40 - 0.48 Ω)

NG Replace sub-throttle valve motor.

OK

2 Check voltage between terminal IDL2 of throttle control ECU and body ground.

PREPARATION:(a) Remove throttle control ECU with connectors still con-

nected.(b) Remove intake air duct.(c) Disconnect sub-throttle valve motor connector.(d) Turn ignition switch ON.CHECK:Measure voltage between terminal IDL2 of throttle control ECUand body ground, when the sub-throttle valve is fully closedand fully open.OK:

Sub-throttle valve position Voltage

Fully closed 0 - 3 V

Fully open 9 - 14 V

OK Go to step 4.

NG


743Author: Date:

1997 SUPRA (RM502U)

3 Check for open and short in harness and connector between terminal IDL2 ofthrottle control ECU and sub-throttle position sensor (See page IN-28 ).


OK

Check and replace throttle control ECU.

4 Check sub-throttle position sensor (See page DI-243 ).

NG Adjust or replace sub-throttle position sensor(See page SF-44).

OK

5 Check for open and short in harness and connector between terminals E01, E1of throttle control ECU and body ground (See page IN-28 ).


OK


F03376

ECM

VTO2

IDL2


39

E10

E963

GR-R

G-OT1519

GR-RGR-R3

T15

26T15

BR

12V

VTA2

12V

12V

GE01

E01

B

B

A

A

12V

12V

12

T15

T15

25

T15

T15

23

T15

13

T15W-B

2EDEC

IDL2

E1

11

24


(SHIELDED)

L

Y

R

B


6

4

3

1


744Author: Date:

1997 SUPRA (RM502U)

DTC 23 Throttle Body Malfunction


23In case the sub-throttle valve is fully open or full close angle

become smaller.

Sub-throttle valve



WIRING DIAGRAM

DI4VY-01

F03378

BE6653

F03379 F03380

ON

IDL2


745Author: Date:

1997 SUPRA (RM502U)







Fully open 9 - 14 V

OK Go to step 3.

NG



OK



746Author: Date:

1997 SUPRA (RM502U)



OK


F03376

ECM

VTO2

IDL2


39

E10

E9

63

GR-R

G-OT15

19

GR-RGR-R3

T15

26T15

BR

12V

VTA2

12V

12V

GE01

E01

B

B

A

A

12V

12V

12T15

T15

25T15

T15

23

T15

13

T15W-B

(Shielded)

L

Y

R

B


6

4

3

1

2EDEC

IDL2

E1

11

24



747Author: Date:

1997 SUPRA (RM502U)

DTC 24 Sub-Throttle Position Sensor Leakage/Sub-Throttle Valve Stuck


24

Instead of sub-throttle valve motor is driven fully open, voltage

at VTA2 of ECU terminal does not output 3.2 V to 4.9 V or

more.

Sub-throttle valve




WIRING DIAGRAM

DI4VZ-01

F03378

BE6653

F03382 F03383

ON

(-)

VTA2(+)


748Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminal VTA2 of throttle control ECU and body ground.


nected.(b) Remove intake air duct.(c) Disconnect sub-throttle valve motor connector.(d) Turn ignition switch ON.CHECK:Measure voltage between terminal VTA2 of throttle control ECUand body ground, when the sub-throttle valve is fully closedand fully open.OK:


Fully closed 0.3 - 0.8 V

Fully open 3.2 - 4.9 V

OK Go to step 3.

NG

2 Check for open and short in harness and connector between terminal VTA2 ofthrottle control ECU and terminal VTO2 of ECM (See page IN-28 ).


OK




OK


749Author: Date:

1997 SUPRA (RM502U)

4 Check for open and short in harness and connector between terminal E1 ofthrottle control ECU and body ground (See page IN-28 ).


OK


F03384

ThrottleControlECU

VTA1

12V

IDL1

E1

T15

T15

T15

6

4

26BR

R

V-Y

3R

R

E10

40

E9

64

VTO1

IDL1

ECM

EDThrottle Position Sensor


750Author: Date:

1997 SUPRA (RM502U)

DTC 31 Throttle Position Sensor Circuit

CIRCUIT DESCRIPTIONThis circuit is not directly related to the TRAC control, but as it has an influence on TRAC control when troubleoccurs in this circuit, it is used to switch off the TRAC system as a fail safe function.


31Throttle position sensor circuit is open circuit and E1 or +B

circuit is short for 0.5 sec. or more.

Throttle position senor

Wire harness and connector (throttle position sensor and E1

circuit)


WIRING DIAGRAM

DI4W0-01

F03385

BE6653

F03386 F03387

ON

IDL1


751Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDUREHINT:The main throttle position sensor signal is transmitted to the throttle control ECU from ECM, so if an erroroccurs at the engine side, the throttle control ECU also detects it.If DTC No. P0120 or P0121 is being output for the engine, troubleshoot the engine first.

1 Is DTC output for the engine?



NO



nected.(b) Disconnect the vacuum hose from the throttle opener,

and apply vacuum to the throttle opener.(c) Turn ignition switch ON.CHECK:Measure voltage between terminal IDL1 of throttle control ECUand body ground, when the throttle valve is fully closed and fullyopen.OK:

Throttle valve position Voltage


Fully open 9 - 14 V

OK Go to step 4.

NG

F03385

BE6653

F03388F03389

ON

VTA1


752Author: Date:

1997 SUPRA (RM502U)

3 Check for open and short in harness and connector between terminal IDL1 ofthrottle control ECU and throttle position sensor (See page IN-28 ).


OK




nected.(b) Disconnect the vacuum hose from the throttle opener,

and apply vacuum to the throttle opener.(c) Turn ignition switch ON.CHECK:Measure voltage between terminal VTA1 of throttle control ECUand body ground, when the throttle valve is fully closed and fullyopen.OK:

Throttle valve position Voltage



OK Go to step 6.

NG


753Author: Date:

1997 SUPRA (RM502U)

5 Check for open and short in harness and connector between terminals VTA1 ofthrottle control ECU and VTO1 of ECM (See page IN-28 ).


OK


6 Check throttle position sensor (See page SF-44).

NG Adjust or replace throttle position sensor(See page SF-44).

OK



OK


F03376

ECM

VTO2

IDL2


39

E10

E9

63

GR-R

G-OT15

19

GR-RGR-R3

T15

26T15

BR

12V

VTA2

12V

12V

GE01

E01

B

B

A

A

12V

12V

12T15

T15

25T15

T15

23

T15

13

T15W-B

(Shielded)

L

Y

R

B


6

4

3

1

2EDEC

IDL2

E1

11

24



754Author: Date:

1997 SUPRA (RM502U)

DTC 32 Sub-Throttle Position Sensor Circuit

CIRCUIT DESCRIPTIONThis sensor detects the opening angle of the sub-throttle valve and sends the appropriate signals to theECU. If a trouble signal is input, the ECU prohibits TRAC control.


32


(1) Sub-throttle position sensor circuit is open and E1 or +B

circuit is short.

(2) Instead of sub-throttle valve motor is driven fully close,

IDL2 of sub-throttle position sensor will not come ON.



Sub-throttle valve

Wire harness and connector (sub-throttle position sensor

and E1 circuit)


WIRING DIAGRAM

DI4W1-01

F03378

BE6653

F03379 F03380

ON

IDL2


755Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDUREHINT:The sub-throttle position sensor signal is transmitted to the throttle control ECU from ECM, so if an erroroccurs at the engine side, the throttle control ECU also detects it.If DTC No. P1400 or P1401 is being output for the engine, troubleshoot the engine first.

1 Is DTC output for the engine?



NO






Fully open 9 - 14 V

OK Go to step 4.

NG



OK

F03378

BE6653

F03382 F03383

ON

VTA2(-) (+)


756Author: Date:

1997 SUPRA (RM502U)



nected.(b) Remove intake air duct.(c) Disconnect sub-throttle valve motor connector.(d) Turn ignition switch ON.CHECK:Measure voltage between terminal VTA2 of throttle control ECUand body ground, when the sub-throttle valve is fully closedand fully open.OK:




OK Go to step 6.

NG

5 Check for open and short in harness and connector between terminals VTA2 ofthrottle control ECU and VTO2 of ECM (See page IN-28 ).


OK




OK

F03377

6

3 1

4


757Author: Date:

1997 SUPRA (RM502U)




Terminls 4 and 6

Continuity



OK



OK


BR5440


5V

NET15

16P-L

38

E10NEO

ECM


758Author: Date:

1997 SUPRA (RM502U)

DTC 41 NE Signal Circuit

CIRCUIT DESCRIPTIONThe throttle control ECU receives engine speed signals (NE signals) from the ECM.


41While engine is running, throttle control ECU detected 0 rpm

signal for 0.8 sec. or more.

Wire harness and connector (NE circuit)

ECM


WIRING DIAGRAM

DI4W2-01

BE6653

F03391 F03392

ON

NE

(Reference)

3 - 6 V

Below 1V

3 ms. 3 ms.


759Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDUREHINT:If DTC No. P0335 is being output for the engine, troubleshoot the engine first.

1 Check for open and short in harness and connector between terminal NE ofthrottle control ECU and terminal NEO of ECM (See page IN-28 ).


OK

2 Check voltage between terminal NE of throttle control ECU and body ground.


nected.(b) Turn ignition switch ON.CHECK:Measure voltage between terminal NE of throttle control ECUand body ground for the engine conditions below.OK:

Engine condition Voltage

OFF (IG ON) 3 - 6 V or below 1 V

ON (Idling) 2 - 3 V (Pulse)

NG Check and replace ECM.

OK


F03393

Trottle Conrol ECU

5V

5V

EFIF

EFI+

EFI-

GE11

P

B

W

(Shielded)

ECM

EFIF

EFI+

EFI-

T15

T15

17

7

20

15

T15

67

E9

27

E10

26

E10 T15


760Author: Date:

1997 SUPRA (RM502U)

DTC 42 Engine Control System Malfunction

CIRCUIT DESCRIPTIONIf trouble in the engine control system causes the malfunction indicator light to light up, this information istransmitted from the ECM to the throttle control ECU. Then throttle control ECU may prohibit TRAC controlas a result.


42ECM detected malfunction signal ON (output voltage at termi-

nal EFIF is 4.5 V or more, or 5.5 V or less for 1 sec. or more).

Wire harness and connector (EFIF circuit)

ECM


WIRING DIAGRAM


1 Check the DTC for the engine (See page DI-147 ).

*1 Repair engine control system according to thecode output.

*2

*1: Output NG code*2: Malfunction indicator light remains ON

DI4W3-01


761Author: Date:

1997 SUPRA (RM502U)

2 Check for open and short in harness and connector between terminal EFIF ofthrottle control ECU and terminal EFIF of ECM (See page IN-28 ).


OK


F03393

Trottle Conrol ECU

5V

5V

EFIF

EFI+

EFI-

GE11

P

B

W

(Shielded)

ECM

EFIF

EFI+

EFI-

T15

T15

17

7

20

15T15

67

E9

27

E10

26

E10 T15


762Author: Date:

1997 SUPRA (RM502U)

DTC 43 ECM Communication Circuit Malfunction


43ECM normal communication data is not received for 5 sec. or

more.

Wire harness and connector (EFI+ and EFI- circuit)

ECM


WIRING DIAGRAM


1 Check for open and short in harness and connector between terminals EFI+ andEFI- of throttle control ECU and ECM (See page IN-28 ).


OK

Check and replace ECM or throttle controlECU.

DI4W4-01

F03368

Throttle ControlECU

R/B No.5


R/BNo.2

Battery

+B

RLY-

RLY+

E01

9

12

4

13BR

L-B

BR-B

L-R14

11

12L-B

L-Y

TR

AC

L-R

BR-B

B

2

1 2A

2

1

5

4

3

5

1

6

5

5

T15

EC

IB5 T16

T16

T16

IB5

IB5


763Author: Date:

1997 SUPRA (RM502U)

DTC 51, 52 Power Source Circuit


51In case power source voltage comes down, sub-throttle valve

angle difference occurs.



52Engine speed is 500 rpm or more and throttle relay is ON and

ECU terminal +B voltage is less than 8 V for 10 sec. or more.

Battery

IC regulator



WIRING DIAGRAM



OK:Voltage: 10 - 14 V


OK

DI4W5-01

BE6653F03395 F03396

ON

E01


764Author: Date:

1997 SUPRA (RM502U)

2 Check for open and short in harness and connector between terminal +B ofthrottle control ECU and throttle control relay (See page IN-28 ).


OK

3 Check voltage between terminals +B and E01 of throttle control ECU connector.


nected.(b) Turn ignition switch ON.CHECK:Measure voltage between terminals +B and E01 of throttle con-trol ECU connector.OK:

Voltage: 9 - 14 V

OK Check and replace throttle control ECU.

NG

BE6653

F03397 F03398

LOCK

E01


765Author: Date:

1997 SUPRA (RM502U)

4 Check continuity between terminal E01 of throttle control ECU connector andbody ground.

CHECK:Measure resistance between terminal E01 of throttle controlECU connector and body ground.OK:

Resistance: 1 Ω or less


OK

Check for open in harness and connector between throttle control ECU and battery (See page IN-28 ).

BR3583BR3582 F00010

Speed Sensor

High Speed

Rotor

+V

-V

Low Speed

To ECU

MagnetCoil

N S


766Author: Date:

1997 SUPRA (RM502U)

DTC 61, 62, 63, 64 Speed Sensor Circuit

CIRCUIT DESCRIPTIONThe speed sensor detects the wheel speed and sends the ap-propriate signals to the ECU. These signals are used to controlboth the ABS and TRAC control systems. The front and rear ro-tors each have 48 serrations.When the rotors rotate, the magnetic field emitted by the perma-nent magnet in the speed sensor generates an AC voltage.Since the frequency of this AC voltage changes in direct propor-tion to the speed of the rotor, the frequency is used by the ECUto detect the speed of each wheel.


61,62,63,64

When the brake switch is OFF, one of the symmetrical wheels’

speed becomes one eight or less of the slowest speed of other

3 wheels continuously for 10 sec. or more.



circuit)


HINT:DTC No.61 is for the right front speed sensor.DTC No.62 is for the left front speed sensor.DTC No.63 is for the right rear speed sensor.DTC No.64 is for the left rear speed sensor.

DI4W6-01

BR5402


12V

FRO

FLO

RRO

RLO

LG-B

O

Y-B

GR-R

SpeedSensor

FRO

FLO

RRO

RLO

ABS ECU

16T16

8

15

7

7

20A20

A20

A20

6

9

A20

T16

T16

T16


767Author: Date:

1997 SUPRA (RM502U)

WIRING DIAGRAM

INSPECTION PROCEDUREHINT:If the DTC is output from the ABS warning light, troubleshoot the ABS first.

1 Check for open and short in harness and connector between terminals FRO,FLO, RRO, RLO of ABS ECU and throttle control ECU (See page IN-28 ).


OK

R14205

2

1

R14213

1

2


768Author: Date:

1997 SUPRA (RM502U)

2 Check speed sensor.

FrontPREPARATION:(a) Remove front fender splash shield.(b) Disconnect speed sensor connector.CHECK:Measure resistance between terminals 1 and 2 of speed sensorconnector.OK:


Resistance: 1 M Ω or higherRearPREPARATION:(a) Remove rear seat cushion, seat back and quarter trim

panel.(b) Disconnect speed sensor connector.CHECK:Measure resistance between terminals 1 and 2 of speed sensorconnector.OK:


Resistance: 1 M Ω or higher

NG Replace speed sensor.


OK

3 Check for open and short in harness and connector between each speed sensorand ABS ECU (See page IN-28 ).


OK


769Author: Date:

1997 SUPRA (RM502U)

4 Check for open and short in harness and connector between terminals FRO,FLO, RRO, RLO of throttle control ECU and ABS ECU (See page IN-28 ).


OK


F03376

ECM

VTO2

IDL2


39

E10

E9

63

GR-R

G-OT15

19

GR-RGR-R3

T15

26T15

BR

12V

VTA2

12V

12V

GE01

E01

B

B

A

A

12V

12V

12T15

T15

25T15

T15

23

T15

13

T15W-B

(Shielded)

L

Y

R

B

Sub-throttleValve Motor

6

4

3

1

2EDEC

IDL2

E1

11

24

Trottle Control ECU


770Author: Date:

1997 SUPRA (RM502U)

DTC 71, 72 Emergency Fuel Cut


71

Vehicle stability control required signal is received 2 times

continuously from ECM and throttle control ECU is detected

the motor system malfunction. The 2nd vehicle stability re-

quired signal is received more or less than 0.5 sec.


Sub-throttle valve

Th ttl t l ECU

72Vehicle stability control required signal is received 2 times

continuously from ECM.


WIRING DIAGRAM

DI4W7-01

F03377

3

6 4

1

F03378

BE6653

F03379 F03380

ON

IDL2


771Author: Date:

1997 SUPRA (RM502U)





Terminal 4 and 6

Continuity



OK






Fully open 9 - 14 V

OK Go to step 4.

NG


772Author: Date:

1997 SUPRA (RM502U)

3 Check for open and short in harness and connector between terminal IDL2 ofthrottle control ECU and sub-throttle osition sensor (See page IN-28 ).


OK




OK

5 Check for open and short in harness and connector between terminal E01, E1 ofthrottle control ECU and body ground (See page IN-28 ).


OK


F03400

J/B No.1

GAUGE12

Throttle ControlECU

WA

ABSWarning Light

YL

L

L L

ABS ECU

12V

WA 511

A20

IF2

T5

T16

1E4 2

T5

12


773Author: Date:

1997 SUPRA (RM502U)

DTC 81 ABS Control System Malfunction


81Engine speed is 500 rpm or more and ABS warning light is ON

for 12 sec. or more.

Wire harness and connector (WA circuit)

ABS ECU


WIRING DIAGRAM


1 Check the DTC for the ABS (See page DI-501 ).

*1 Repair ABS control system according to thecode output.

*2

*1: Output NG code*2: Malfunction indicator light remains ON

DI4W8-01

BE6653

F03401 F03402

ON

WA


774Author: Date:

1997 SUPRA (RM502U)

2 Check voltage between terminal WA of throttle control ECU and body ground(See page IN-28 ).

PREPARATION:Remove throttle control ECU with connectors still connected.CHECK:Measure voltage between terminal WA of throttle control ECUand body ground.OK:

Voltage: 9 - 14 V

NG Check and replace ABS ECU.

OK

3 Check for short in harness and connector between terminal WA of ABS ECU andthrottle control ECU (See page IN-28 ).


OK


F03403


WT

12V

CSWT16

T16

6

10LG-RLG-R

IF22

TRAC OFF Switch(TRAC Control Switch)

LG46

W-B

IGIE

W-B

W-B

LG-R

13OPA

DLC2

J/B No.1

GAUGE1E12

YT5

2

TRAC OFFIndicator

T58

LG-R


775Author: Date:

1997 SUPRA (RM502U)

TRAC OFF Indicator Light, TRAC OFF Switch Circuit

CIRCUIT DESCRIPTIONThis is the TRAC control main switch. When the TRAC OFF switch is pushed on, TRAC control goes off andthe TRAC OFF indicator lights up. This indicator blinks for warnings when the trouble occurs and for display-ing DTC.

WIRING DIAGRAM


1 Check DTC.



NO

DI4W9-01

F03404

TRAC OFF Switch(TRAC Control Switch)

4 6


776Author: Date:

1997 SUPRA (RM502U)

2 Check TRAC OFF switch.

PREPARATION:(a) Remove TRAC OFF switch (TRAC control switch).(b) Disconnect TRAC control switch connector.CHECK:Measure resistance between terminals 4 and 6 of TRAC controlswitch when TRAC OFF switch is on and off.OK:

TRAC OFF switch Resistance

Pushed in Continuity

Released 1 MΩ or higher

NG Replace TRAC control switch.

OK

3 Check for open and short in harness and connector between terminal CSW ofthrottle control ECU and TRAC control switch and body ground(See page IN-28 ).


OK

4 Check TRAC OFF indicator light.


NG Repair or replace combination meter.

OK


777Author: Date:

1997 SUPRA (RM502U)

5 Check for open and short in harness and connector between terminal WT ofthrottle control ECU and TRAC OFF indicator light (See page IN-28 ).


OK


F03405


INDT16

2W

IF21

WC12

7

SLIPIndicatorLight

C10Y

1E

12

J/B No.1

GAUGE

9


778Author: Date:

1997 SUPRA (RM502U)

SLIP Indicator Light Circuit

CIRCUIT DESCRIPTIONThe SLIP indicator blinks during TRAC operation.

WIRING DIAGRAM


1 Check SLIP indicator light.



OK

2 Check for short in harness and connector between throttle control ECU and SLIPindicator light (See page IN-28 ).


OK


DI4WA-01

F03406F03406


SNOWIndicatorLightJ/B No.1

SNOW Mode Switch(TRAC Control Switch)

SIND

SNOW

GAUGE

P-GP-G

R-BW-BW-B

W-B

YT16

11

T16

14

IF1

9C12

5

C109

1E

12

IE IG

86

F03407

6

8

SNOW Mode Switch(TRAC Control Switch)


779Author: Date:

1997 SUPRA (RM502U)

SNOW Indicator Light, SNOW Mode Switch Circuit

CIRCUIT DESCRIPTIONWhen you push the SNOW mode switch, TRAC control becomes SNOW mode operation and the SNOWindicator light on, and when you push the TRAC OFF switch, TRAC control will be released to normal modeoperation and the SNOW indicator light goes off.

WIRING DIAGRAM


1 Check SNOW mode switch.

PREPARATION:(a) Remove SNOW mode switch (TRAC control switch).(b) Disconnect TRAC control switch connector.CHECK:Measure resistance between terminals 6 and 8 of TRAC controlswitch when SNOW mode switch on and off.OK:

TRAC control switch Resistance

SNOW mode switch pushed in Continuity

TRAC OFF switch pushed in 1 MΩ or higher

NG Replace TRAC control switch.

OK

DI4WB-01


780Author: Date:

1997 SUPRA (RM502U)

2 Check for open and short in harness and connector between SNSW of throttlecontrol ECU and TRAC control switch and body ground (See page IN-28 ).


OK

3 Check SNOW indicator light.



OK

4 Check for short in harness and connector between throttle control ECU andSNOW indicator light (See page IN-28 ).


OK


F03408


12V

TcRR

R

P-BDLC1

TcE1BR

BR

BR

BR

DLC2

E1 Tc

31121

113

18

ED

3 4IJ1

II1 IF1 T16P-B

S−17−1 F02201 F03525

DLC2 DLC1E1

Tc E1

Tc


781Author: Date:

1997 SUPRA (RM502U)

Tc Terminal Circuit

CIRCUIT DESCRIPTIONBy connecting terminals Tc and E1 of DLC1 or DLC2, the ECU displays the DTC by blinking the TRAC OFFindicator light.

WIRING DIAGRAM


1 Check voltage between terminals Tc and E1 of DLC2 or DLC1.

PREPARATION:Turn ignition switch ON.CHECK:Measure voltage between terminals Tc and E1 of DLC2 orDLC1.OK:

Voltage: 10 - 14 V

OK Proceed to next circuit inspection shown onproblem symptoms chart (See page DI-508 ).

NG

DI4WC-01


782Author: Date:

1997 SUPRA (RM502U)

2 Check for open and short in harness and connector between throttle controlECU and DLC2 or DLC1, DLC2 or DLC1 and body ground (See page IN-28 ).


OK


DI4WD-01


Customer Problem Analysis

Warning Light Check

DTC Check

DTC Chart

DI-560

Circuit Inspection

Remains on

Normal and Malfunction Code

Symptom Simulation

DTC Check


Warning Light Check

Confirmation Test

Warning Light ON

Warning Light Remains Off

END

Normal

Normal

1

2

3

4

7

Repair

8

5

6

Step , : Diagnostic steps permitting the useof the TOYOTA hand-held tester.

3 6

DI-556

DI-557 IN-18

DI-564 to DI-603

DI-557

DI-557

DI-557

Remains ON

-DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEMDI-555

783Author: Date:

1997 SUPRA (RM502U)

SUPPLEMENTAL RESTRAINT SYSTEMHOW TO PROCEED WITH TROUBLESHOOTINGPerform troubleshooting in accordance with the procedure on the following pages.

DI4WE-01

Supplemental Restraint System Check Sheet

Date Problem Occurred

Customer’s Name

Registration No.

Registration Year

Frame No.

Odometer Reading

Weather

Temperature

Vehicle Operation

Road Conditions

Details Of Problem

Vehicle Inspection, Repair Histo-ry Prior to Occurrence of Mal-function(Including SupplementalRestraint System)

Diagnosis System Inspection

SRS Warning Light Inspection

DTC Inspection

1st Time

2nd Time

1st Time

2nd Time

Inspector’s Name

Fine Cloudy Rainy Snowy Other

Approx.

Starting Idling

Driving [ Constant speed Acceleration DecelerationOther ]

Remains ON Sometimes Light Up Does Not Light Up

Remains ON Sometimes Light Up Does Not Light Up

Normal Code Malfunction Code

Normal Code Malfunction Code

[ Code. ]

[ Code. ]

kmMiles

/ /

/ /

/ /

Date Vehicle Brought In

DI-556-DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM

784Author: Date:

1997 SUPRA (RM502U)


DI4WF-01

R06853

H03184

E1 Tc

Tc E1

DLC 1

DLC 2


785Author: Date:

1997 SUPRA (RM502U)

PRE-CHECK1. CHECK SRS WARING LIGHT(a) Turn the ignition switch to ACC or ON and check that the

SRS warning light lights up.(b) Check that the SRS warning light goes out after approx.

6 seconds.HINT: When the ignition switch is at ACC or ON and the SRS

warning light remains on or flashes, the airbag sensor as-sembly has detected a malfunction code.

If, after approx. 6 seconds have elapsed, the SRS warn-ing light sometimes lights up or the SRS warning lightlights up even when the ignition switch is OFF, a short inthe SRS warning light circuit can be considered likely.Proceed to ”SRS warning light system malfunction” onpage DI-598 , DI-600 .

2. CHECK DTC (Using diagnosis check wire)(a) Using diagnosis check wire, check the output of DTC.

(1) Turn the ignition switch to ACC or ON position andwait approx. 20 seconds.

(2) Using SST, connect the terminals Tc and E1 of theDLC1.

HINT:DTC check and troubleshooting of each DTC can also be doneusing DLC2.

SST 09843-18020NOTICE:Never make a mistake with the terminal connection posi-tion as this will cause a malfunction.

AT0716

Normal Code

ON

OFF

0.25

0.25

AB0056

code 11 and 31

ON

OFF

0.5 2.5 4.0

1.5 0.5

Code 11 Code 31

Repeat

H03217


786Author: Date:

1997 SUPRA (RM502U)

(b) Read the DTC.Read the 2-digit DTC as indicated by the number of timesthe SRS warning light blinks. As an example, the blinkingpatterns, normal, 11 and 31 are as shown on the illustra-tion. Normal code indication

The light will blink 2 times per second. Malfunction code indication

The first blinking output indicates the first digit of a2-digit DTC. After a 1.5 second pause, the secondblinking output will indicate the second digit.

If there are 2 or more codes, there will be a 2.5 second pausebetween each code. After all the codes have been output, therewill be a 4.0 second pause and they will all be repeated.HINT: In the event of a number of trouble codes, indication will

start from the smallest numbered code. If it does not output a DTC or outputs a DTC without termi-

nal connection, proceed to the Tc terminal circuit inspec-tion on page DI-603 .

3. CHECK DTC (Using TOYOTA hand-held tester)(a) Hook up the TOYOTA hand-held tester to the check con-

nector.(b) Read the DTCs by following the prompts on the tester

screen.HINT:Please refer to the TOYOTA hand-held tester operator’s manu-al, for further details.

4. CLEAR DTC (Using diagnosis check wire)When the ignition switch is turned off, the DTC is cleared.

AB0130 AB0045 AB0046

W03146 W03147

W01805

H09720

Connector (1)

Airbag Sensor Assembly

Front Passenger Airbag Assembly

No.1 J/B

Spiral Cable

Steering WheelPad (Squib)

Connector (2)

Connector (3)

Connector (5)

Connector (4)

Aibag Sensor Assembly Connector [Connector (1)]

Short Spring

Before Release After Release

Spiral Cable Connector [Connector (5)]

Short Spring Before Release

Paper

After Release


787Author: Date:

1997 SUPRA (RM502U)

5. RELEASE METHOD OF AIRBAG ACTIVATION PREVENTION MECHANISMAn airbag activation prevention mechanism is built into the connecter for the squib circuit of the SRS.When release of the airbag activation prevention mechanism is directed in the troubleshooting procedure,as shown in the illustration of the connectors (1) and 839 below, insert paper which is the same thicknessas the male terminal, between the terminal and the short spring.CAUTION: NEVER RELEASE the airbag activation prevention mechanism on the steering wheel pad con-

nector.NOTICE: Do not release the airbag activation prevention mechanism unless specifically directed by the

troubleshooting procedure. If the paper inserted is too thick the terminal and short spring may be damaged, so always use

paper the same thickness as the male terminal.

DI4WG-01


788Author: Date:

1997 SUPRA (RM502U)

DIAGNOSTIC TROUBLE CODE CHARTDTC No.


SRS

Warning Light

(N l)System normal - OFF

(Normal)

(DI-595 )Source voltage drop Battery

Airbag sensor assemblyON

11

(DI-564 )

Short in squib circuit (to ground) Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness

ON

12

(DI-571 )

Short in squib circuit (to B+) Steering wheel pad (D squib)


Spiral cable


Wire harness

ON

13

(DI-577 )

Short in D squib circuit Steering wheel pad (D squib)

Spiral cable


Wire harness

ON

14

(DI-582 )

Open in D squib circuit Steering wheel pad (D squib)

Spiral cable


Wire harness

ON

31

(DI-586 )

Airbag sensor assembly malfunction Airbag sensor assemblyON

53

(DI-588 )

Short in P squib circuit Front passenger airbag assembly (P squib)


Wire harness

ON

54

(DI-592 )

Open in P squib circuit Front passenger airbag assembly (P squib)


Wire harness

ON

HINT: When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage

drop.This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-age returns to normal, after approx. 10 seconds the SRS warning light will automatically go out.

When 2 or more codes are indicated, the codes will be displayed in numeral order starting from thelowest numbered code.

If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.

DI4WH-01

W02646

SRS Waring Light(Telltale Light RH) Front Passenger

Airbag Assembly

Steering Wheel Pad(with Airbag)

Spiral Cable



789Author: Date:

1997 SUPRA (RM502U)

PARTS LOCATION

DI4WI-01

W02759

6 5 4 3

10 9

2 1

78B A


790Author: Date:

1997 SUPRA (RM502U)

TERMINALS OF ECM

No. Symbol Terminal Name

A - Electrical Connection Check Mechanism

B - Electrical Connection Check Mechanism

1 P- Squib (Passenger)

2 P+ Squib (Passenger)

3 LA SRS Warning Light

4 D- Squib (Driver)

5 D+ Squib (Driver)

6 Tc Diagnosis

7 E2 Ground

8 E1 Ground

9 IG2 Power Source (IGN Fuse)

10 ACC Power Source (CIG Fuse)

DI4WJ-01


791Author: Date:

1997 SUPRA (RM502U)

PROBLEM SYMPTOMS TABLE

Proceed with troubleshooting of each circuit in the table below.

Problem Symptom Inspection Item Page

WIth the ignition switch at ACC or ON, the SRS warning light

sometimes lights up after approx. 6 seconds have elapsed.

SRS warning light lights up even when ignition switch is in the

LOCK position.

SRS warning light system malfunction (Always lit up when

ignition switch is in LOCK position.)DI-598

WIth the ignition switch at ACC or ON, the SRS warning light

does not light up.

SRS warning light system malfunction (Does not light up

when ignition switch is turned to ACC or ON.)DI-600

DTC not displayed.

SRS warning light is always lit up with a DTC check procedure.

DTC displayed without Tc and E1 terminal connection.

Tc terminal circuit DI-603

DI4WK-01

W01021

P squib

D squib

A34

A34

A34

A34

L

Y

R

W

Airbag SensorAssembly

P+3

2

7

6

1

2

1

2

D+

D-

P-

SpiralCable


792Author: Date:

1997 SUPRA (RM502U)

CIRCUIT INSPECTION

DTC 11 Short in Squib Circuit (to Ground)

CIRCUIT DESCRIPTIONThe squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2 .DTC 11 is recorded a when ground short is detected in the squib circuit.


11

Short circuit in squib wire harness (to ground).

Squib malfunction.

Spiral cable malfunction.

Airbag sensor assembly malfunction.

Steering wheel pad (D squib)


Spiral cable


Wire harness

WIRING DIAGRAM

R05894

R14301 H07909

P squibAirbag SensorAssembly

D squib

D+

SpiralCable


793Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURES

1 Preparation (See step 1 on page DI-595 ).

2 Check D squib circuit.

CHECK:For the connector (on the spiral cable side) between the spiralcable and steering wheel pad, measure the resistance betweenD+ and body ground.OK:


NG Go to step 7.

OK

R05898

R14301 H07910


D squib

P+

SpiralCable


794Author: Date:

1997 SUPRA (RM502U)

3 Check P squib circuit.

PREPARATION:For the connector (on the airbag sensor assembly side) be-tween the airbag sensor assembly and front passenger airbagassembly, measure the resistance between P+ and bodyground.OK:


NG Repair or replace harness or connector be-tween the airbag sensor assembly and frontpassenger airbag assembly.

OK

AB0069

R05902

AB0118 AB0119

AB0057

AB0069

N19819 H07911

P squib


D squib

SpiralCable

ACC ON

or

E1 Tc

DLC1Code 11

P+P-

D+D-


795Author: Date:

1997 SUPRA (RM502U)

4 Check airbag sensor assembly.

PREPARATION:(a) Connect the connector to airbag sensor assembly.(b) Using a service wire, connect D+ and D- on spiral cable

side of connector between spiral cable and steeringwheel pad.

(c) Using a service wire, connect P+ and P- on airbag sensorassembly side of connector between airbag sensor as-sembly and front passenger airbag assembly.

(d) Connect negative (-) terminal cable to battery, and waitat least 2 seconds.

CHECK:(a) Turn the ignition switch to ACC or ON and wait at least 20

seconds.(b) Clear malfunction code stored in memory.

(See page DI-557 )(c) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(d) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(e) Using SST, connect the terminals Tc and E1 of DLC1.

SST 09843-18020(f) Check DTC.OK:

DTC 11 is not output.HINT:Codes other than code 11 may be output at this time, but theyare not relevant to this check.

NG Replace airbag sensor assembly.

OK

H03221


D squibSpiralCable

ACC ON

E1 Tc

DLC1 Code 11

or


796Author: Date:

1997 SUPRA (RM502U)

5 Check D squib.

PREPARATION:(a) Turn the ignition switch to LOCK.(b) Disconnect negative (-) terminal cable from the battery,

and wait at least 90 seconds.(c) Connect the steering wheel pad connector.(d) Connect negative (-) terminal cable to battery, and wait

at least 2 seconds.CHECK:(a) Turn the ignition switch to ACC or ON and wait at least 20







NG Replace steering wheel pad.

OK

H03222

P squib

SpiralCable

ACC ON

E1 Tc

DLC1 Code 11

or


D squib


797Author: Date:

1997 SUPRA (RM502U)

6 Check P squib.


and wait at least 90 seconds.(c) Connect the front passenger airbag assembly connector.(d) Connect negative (-) terminal cable to battery, and wait

at least 2 seconds.CHECK:(a) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(b) Clear malfunction code stored in memory.






NG Replace front passenger airbag assembly.

OK

From the results of the above inspection, the malfunctioning part can now be considered normal.To make sure of this, use the simulation method to check. If the malfunctioning part can not bedetected by the simulation method, replace all SRS components including the wire harness.

R05899

R14301 H07912

P squib

SpiralCable


D squib

D+


798Author: Date:

1997 SUPRA (RM502U)

7 Check spiral cable.

PREPARATION:Disconnect the connector between airbag sensor assemblyand spiral cable.CHECK:Measure the resistance between D+ on spiral cable side of con-nector between spiral cable and steering wheel pad and bodyground.OK:


NG Repair or replace spiral cable.

OK

Repair or replace harness or connector be-tween airbag sensor assembly and spiralcable.

AB0119

R05901

R14288 H07913

P squib

SpiralCable


D squib

ON


799Author: Date:

1997 SUPRA (RM502U)

DTC 12 Short in Squib Circuit (to B+)

CIRCUIT DESCRIPTIONThe squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2 .DTC 12 is recorded when a B+ short is detected in the squib circuit.


12

Short circuit in squib wire harness (to B+).

Squib malfunction.





Spiral cable


Wire harness

WIRING DIAGRAMRefer to page DI-564 for the WIRING DIAGRAM.




CHECK:For the connector (on the spiral cable side) between the spiralcable and steering wheel pad, measure the voltage between D+

and body ground.OK:

Voltage: 0 V

NG Go to step 7.

OK

DI4WL-01

AB0119

R05898

R14288 H07914

P squib

SpiralCable


D squib

ON

P+

(+)(-)


800Author: Date:

1997 SUPRA (RM502U)


CHECK:For the connector (on the airbag sensor assembly side) be-tween airbag sensor assembly and front passenger airbag as-sembly, measure the voltage between P+ and body ground.OK:

Voltage: 0 V

NG Repair or replace harness or connector be-tween the airbag sensor assembly and frontpassenger airbag assembly.

OK

AB0069R05902AB0069

AB0118 AB0119

FI1389N19819 H07915

P squib


D squibSpiralCable

ACC ON

or

E1Tc

DLC1 Code 12

P+P-

D+D-


801Author: Date:

1997 SUPRA (RM502U)




(c) Using a service wire, connect P+ and P- on airbag sensorassembly side of connector between airbag sensor as-sembly and front passenger airbag assembly.

(d) Connect negative (-) terminal cable to battery, and waitat least 2 seconds.








+NG Replace airbag sensor assembly.

OK

H03224

P squib

SpiralCable


D squib

ONACC

DLC 1 Code 12

TcE1

or


802Author: Date:

1997 SUPRA (RM502U)

5 Check D squib.











OK

H03225

P squib

SpiralCable


D squib

ONACC

DLC 1 Code 12

TcE1

or


803Author: Date:

1997 SUPRA (RM502U)

6 Check P squib.







20 seconds.(e) Using SST, connect the the terminals Tc and E1 of DLC1.




OK

From the results of the above inspection, the malfunctioning part can now be considered normal.To make sure of this, use the simulation method to check.

AB0119

R05899

R14288 H07916

P squib

SpiralCable


D squib

ON


804Author: Date:

1997 SUPRA (RM502U)


PREPARATION:(a) Turn the ignition switch to LOCK.(b) Disconnect the connector between airbag sensor assem-

bly and spiral cable.(c) Turn the ignition switch ON.CHECK:Measure voltage at D+ on spiral cable side of connector be-tween spiral cable and steering wheel pad and body ground.OK:

Voltage: 0 V


OK

Repair or replace harness or connector between airbag sensor assembly and spiral cable.

R16015

D squib SpiralCable

1

2

R

W

7

6


A34

A34 D-

D+


805Author: Date:

1997 SUPRA (RM502U)

DTC 13 Short in D Squib Circuit

CIRCUIT DESCRIPTIONThe D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.It causes the airbag to deploy when the airbag deployment conditions are satisfied.For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2 .DTC 13 is recorded when a short is detected in the D squib circuit.


13

Short circuit between D+ wire harness and D- wire harness

of squib.

D squib malfunction.




Spiral cable


Wire harness

WIRING DIAGRAM

DI4WM-01

R05901

R14286 H07917

P squib

SpiralCable


D squib

D- D+

(-) (+)


806Author: Date:

1997 SUPRA (RM502U)




PREPARATION:Release airbag activation prevention mechanism on airbagsensor assembly side of airbag squib connector.(See page DI-557 )CHECK:For the connector (on the spiral cable side) between the spiralcable and steering wheel pad, measure the resistance betweenD+ and D- .OK:

Resistance: 1M Ω or Higher

NG Go to step 5.

OK

H03227

P squib

SpiralCable

D squib


ACC ON

or

DLC1 Code 13

E1 Tc


807Author: Date:

1997 SUPRA (RM502U)


PREPARATION:(a) Connect the connector to airbag sensor assembly.(b) Connect negative (-) terminal cable to battery, and wait









OK

H03228

P squib

SpiralCable

D squib


ACC ON

or

DLC1 Code 13

E1 Tc


808Author: Date:

1997 SUPRA (RM502U)

4 Check D squib.



at least 2 seconds.CHECK:(a) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(b) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(c) Clear malfunction code stored in memory.

(See page DI-557 )(d) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(e) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(f) Using SST, connect the terminals Tc and E1 of DLC1.

SST 09843-18020(g) Check DTC.OK:



OK


R05903

R14286 H07918

P squib

SpiralCable

D squib


D- D+

(-) (+)

R05904

R14286 H03814

P squib

SpiralCable

D squib


(-) (+)

D- D+


809Author: Date:

1997 SUPRA (RM502U)


PREPARATION:(a) Disconnect the connector between airbag sensor assem-

bly and spiral cable.(b) Release airbag activation prevention mechanism on air-

bag sensor assembly side of airbag squib connector (Seepage DI-557 ).

CHECK:For the connector (on the spiral cable side) between the spiralcable and steering wheel pad, measure the resistance betweenD+ and D- .OK:

Resistance: 1M Ω or Higher


OK

6 Check harness between airbag sensor assembly and spiral cable.

PREPARATION:Release airbag activation prevention mechanism on airbagsensor assembly side of airbag squib connector (See pageDI-557 ).CHECK:For the connector (on the airbag sensor assembly side) be-tween the spiral cable and airbag sensor assembly, measurethe resistance between D+ and D- .OK:


NG Repair or replace harness or connector be-tween airbag sensor assembly and spiral cable.

OK


R05901

R14286 H07919

P squib

SpiralCable


D squib

D- D+

(-) (+)


810Author: Date:

1997 SUPRA (RM502U)

DTC 14 Open in D Squib Circuit

CIRCUIT DESCRIPTIONThe D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.It causes the airbag to deploy when the airbag deployment conditions are satisfied.For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2 .DTC 14 is recorded when an open is detected in the D squib circuit.


14

Open circuit in D+ wire harness or D- wire harness of squib.

D squib malfunction.




Spiral cable


Wire harness





CHECK:For the connector (on the spiral cable side) between the spiralcable and steering wheel pad, measure the resistance betweenD+ and D- .OK:

Resistance: Below 1 Ω

NG Go to step 5.

OK

DI4WN-01

R05895 AB0069

AB0118 AB0119

FI1391N19819 H07920


D squib SpiralCable

ACC ON

or

E1Tc

DLC1Code 14

D+D-


811Author: Date:

1997 SUPRA (RM502U)




(c) Connect negative (-) terminal cable to battery, and waitat least 2 seconds.

CHECK:(a) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(b) Clear malfunction code stored in memory.







OK

H03231

P squib

SpiralCable


D squib

ACC ON

or

E1

DLC1 Code 14

Tc


812Author: Date:

1997 SUPRA (RM502U)

4 Check D squib.











OK


R05899

R14286 H07921

P squib

SpiralCable


D squib

D- D+

(-) (+)

R05904

R14286 H03814

P squib

SpiralCable


D squib

D+

(-) (+)

D-


813Author: Date:

1997 SUPRA (RM502U)


PREPARATION:Disconnect the connector between airbag sensor assemblyand spiral cable.CHECK:For the connector (on the spiral cable side) between the spiralcable and steering wheel pad, measure the resistance betweenD+ and D- .OK:



OK

6 Check harness between airbag sensor assembly and spiral cable.

CHECK:For the connector (on the airbag sensor assembly side) be-tween the airbag sensor assembly and spiral cable, measurethe resistance between D+ and D- .OK:


NG Repair or replace harness or connector be-tween airbag sensor assembly and spiral cable.

OK


AB0119

W02766 H00041

ON Airbag Sensor Assembly

ACC

IG2(-) (+)


814Author: Date:

1997 SUPRA (RM502U)

DTC 31 Airbag Sensor Assembly Malfunction

CIRCUIT DESCRIPTIONThe airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit andignition control, etc.It receives signals from the airbag sensors, judges whether or not the SRS must be activated, and diagnosissystem malfunction.DTC 31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.


31 Airbag sensor assembly malfunction. Airbag sensor assembly

INSPECTION PROCEDURESHINT:When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction indi-cated by the malfunction code other than code 31.


2 Check voltage at IG2 and ACC of airbag sensor assembly.

PREPARATION:Turn the ignition switch ON.CHECK:Measure the voltage between terminals IG2 and ACC of airbagsensor assembly and body ground.OK:

Voltage: Below 16 V

NG Check battery and charging system.(See charging system section)

OK

DI4WO-01

H03232

ACC ON

or

DLC1 Code 31

E1 Tc


815Author: Date:

1997 SUPRA (RM502U)

3 Is DTC 31 output again?

PREPARATION:Clear malfunction code.CHECK:(a) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(b) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(c) Repeat operation in step (1) and (2) at least 5 times.(d) Using SST, connect the terminals Tc and E1 of DLC1.

SST 09843-18020(e) Check DTC.

NO Using simulation method, reproduce malfunc-tion symptoms (See page IN-18 ).

YES

Replace airbag sensor assembly.

R16016

P squib


1

2

L

Y2

3P+

P-

A34

A34


816Author: Date:

1997 SUPRA (RM502U)

DTC 53 Short in P Squib Circuit

CIRCUIT DESCRIPTIONThe P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.It causes the airbag to deploy when the airbag deployment conditions are satisfied.For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2 .DTC 53 is recorded when a short is detected in the P squib circuit.


53

Short circuit between P+ wire harness or P- wire harness of

squib.

P squib malfunction.




Wire harness

WIRING DIAGRAM

DI4WP-01

R05898

R14287 H07922

P squib

SpiralCable


D squib


817Author: Date:

1997 SUPRA (RM502U)




PREPARATION:Release airbag activation prevention mechanism on airbagsensor assembly side of airbag squib connector (See page DI-557 )CHECK:For the connector (on the airbag sensor assembly side) be-tween the airbag sensor assembly and front passenger airbagassembly, measure the resistance between P+ and P- .OK:

Resistance: 1 M Ω or Higher

NG Repair or replace harness or connector be-tween airbag sensor assembly and front pas-senger airbag assembly.

OK

H03233

P squib

SpiralCable


D squib

ACC ON

DLC1 Code 53

E1 Tc

or


818Author: Date:

1997 SUPRA (RM502U)


PREPARATION:(a) Connect the connector to airbag sensor assembly.(b) Connect negative (-) terminal cable to battery, and wait









OK

H03234

P squib

SpiralCable


D squib

ACC ON

DLC1 Code 53

or

E1 Tc


819Author: Date:

1997 SUPRA (RM502U)

4 Check P squib.



at least 2 seconds.CHECK:(a) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(b) Turn the ignition switch to ACC or ON and wait at least 20

seconds.(c) Clear malfunction code stored in memory.

(See page DI-557 )(d) Turn the ignition switch to LOCK, and wait at least 20 se-

conds.(e) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(f) Using SST, connect the terminals Tc and E1 of DLC1.

SST 09843-18020(g) Check DTC.OK:



OK


R14287

R05898 H07923


D squibSpiralCable

P-

(+)(-)

P+


820Author: Date:

1997 SUPRA (RM502U)

1

DTC 54 Open in P Squib Circuit

CIRCUIT DESCRIPTIONThe P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.It causes the airbag to deploy when the airbag deployment conditions are satisfied.For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2 .DTC 54 is recorded when an open is detected in the P squib circuit.


54

Open circuit in P+ wire harness or P- wire harness of squib.

P squib malfunction.




Wire harness





CHECK:For the connector (on the airbag sensor assembly side) be-tween the airbag sensor assembly and front passenger airbagassembly measure the resistance between P+ and P- .OK:


NG Repair or replace harness or connector be-tween airbag sensor assembly and front pas-senger airbag assembly.

OK

DI4WQ-01

AB0069 R05895

AB0118 AB0119

R05170N19819 H07974


D squibSpiralCable

ACC ON

or Code 54DLC1

E1 Tc

P+P-


821Author: Date:

1997 SUPRA (RM502U)


PREPARATION:(a) Connect the connector to airbag sensor assembly.(b) Using a service wire, connect P+ and P- on airbag sensor

assembly side of connector between airbag sensor as-sembly and front passenger airbag assembly.

(c) Connect negative (-) terminal cable to battery, and waitat least 2 seconds.









OK

H03236


D squibSpiralCable

ACC ON

or

DLC1 Code 54

E1 Tc


822Author: Date:

1997 SUPRA (RM502U)

4 Check P squib.











OK


W00786

Relay Block No.2 Junction Block No.1


2

2

1B 1J1J

1J 1G

1G6

103

83 G44

WA

LT

AM

2

Battery

IB14

Ignition Switch

Junction Block No.1

ACC16

15

AM

1

6 B-W

7

2

W-R

G-R

B-O IG2

W

2 2

2A Rel

ay B

lock

No.

2

W

B

1

W-R

CIG

IGN


823Author: Date:

1997 SUPRA (RM502U)

DTC Normal Source Voltage Drop

CIRCUIT DESCRIPTIONThe SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly incase the source voltage drops.When the battery voltage drops, the voltage-increase circuit (DC-DC converter)functions to increase thevoltage of the SRS to normal voltage.The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warninglight remains lit up and the DTC is a normal code, source voltage drop is indicated.Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns tonormal, the SRS warning light automatically goes off.


Normal Source voltage drop.Battery


WIRING DIAGRAM

DI4WR-01

R05894AB0117

H00001


D squibSpiralCable

LOCK

AB0119

W02766 H00041

Airbag Sensor AssemblyON

ACCIG2

(-) (+)


824Author: Date:

1997 SUPRA (RM502U)


1 Preparation.

PREPARATION:(a) Disconnect negative (-) terminal cable from the battery,

and wait at least 90 seconds.(b) Remove the steering wheel pad (See SR Section).(c) Disconnect the connector of front passenger airbag as-

sembly (See page RS-21 ).(d) DIsconnect the connector of airbag sensor assembly

(See page RS-33 ).CAUTION:Store the steering wheel pad with the front surface facingupward.

2 Check source voltage.

PREPARATION:(a) Connect negative (-) terminal cable to the battery.(b) Turn the ignition switch ON.CHECK:Measure the voltage at IG2 or ACC on sensor and operate elec-tric system. (defogger, wiper, headlight, heater blower, etc)OK:

Voltage: 10 - 14 V

NG Check the harness between battery and airbagsensor assembly, and check the battery andcharging system.

OK

AB0119

AB0234 H07975

ON


825Author: Date:

1997 SUPRA (RM502U)

3 Does SRS warning light turn off ?

PREPARATION:(a) Turn the ignition switch to LOCK.(b) Connect the steering wheel pad connector.(c) Connect the front passenger airbag assembly connector.(d) Connect the airbag sensor assembly connector.(e) Turn the ignition switch ON.CHECK:Operate electric system checked in (defogger, wiper, headlight,heater blower, etc.) and check that SRS warning light goes off.

NO Check for DTCs. If a DTC is output, trouble-shooting for the DTC. If a normal code is output,replace airbag sensor assembly.

YES


W03534

2 1E 1G

1E 1G

II1

IF1

IF1

II1

1E1B

3 7

94

2 13

12

11

21

2

Bat

tery

1

B

5

11

DLC1Relay Block No.2

ALT P

ower

Pow

er


Junction Block No.1

Junction Block No.1

SRS Waring Light

2 15

Junction Block No.1

*1: 2JZ-GE Engine*2: 2JZ-GTE Engine

ECU-B

Tc

AB

B (*1)(*2) B-Y LA12

W-R

P-BR (*1)

(*2) P-B

P-B

2

2A 2

P-B 7 Tc

W-L

AB

Tc

DLC2

R4

12B-Y

BB

B B


826Author: Date:

1997 SUPRA (RM502U)

SRS Warning Light System Malfunction (Always lit up, when igni-tion switch is in LOCK position.)

CIRCUIT DESCRIPTIONThe SRS warning light is located on the combination meter.When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch isturned from LOCK position to ACC or ON position, and then turns off automatically.If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-ing light.

WIRING DIAGRAM

DI4WS-01

AB0117

R05902 H07976

LOCK

P squib

SpiralCable


D squib

AB0117

W02765 H00044

LOCKAirbag Sensor Assembly


827Author: Date:

1997 SUPRA (RM502U)


1 Preparation.

PREPARATION:(a) Disconnect negative (-) terminal cable from the battery,

and wait at least 90 seconds.(b) Remove the steering wheel pad (See SR Section).(c) Disconnect the connector of front passenger airbag as-

sembly (See page RS-21 ).CAUTION:Store the steering wheel pad with the front surface facingupward.

2 Does SRS warning light turn off?


and wait at least 90 seconds.(c) Disconnect the airbag sensor assembly connector.(d) Connect negative (-) terminal cable to battery.CHECK:Check operation of SRS warning light.

NG Check SRS warning light circuit or terminal ABcircuit of DLC1.

OK


N14677

Fuse

(+)(-)


828Author: Date:

1997 SUPRA (RM502U)

SRS Warning Light System Malfunction (Does not light up, whenignition switch is in turned to ACC or ON.)

CIRCUIT DESCRIPTIONThe SRS warning light is located on the combination meter.When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch isturned from LOCK position to ACC or ON position, and then turns off automatically.If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-ing light.



1 Check ECU-B Fuse.

PREPARATION:Remove the ECU-B fuse.CHECK:Check the continuity of ECU-B fuse.OK:

ContinuityHINT: Fuse may be burnt out even if it appears to be OK during

visual inspection. If fuse is OK, install it.

NG Go to step 5.

OK


DI4WT-01

W02760

AB0119

H00048

ONAirbag Sensor Assembly

LA(-) (+)

H03185

P squib

SpiralCable


D squib

ON


829Author: Date:

1997 SUPRA (RM502U)

3 Check SRS warning light circuit.

PREPARATION:(a) Connect negative (-) terminal cable to battery.(b) Turn the ignition switch to ACC or ON.CHECK:Measure the voltage LA terminal of harness side connector ofairbag sensor assembly.OK:

Voltage: 10 - 14 V

NG Check SRS warning light balb/repair SRS warn-ing light circuit.

OK

4 Does SRS warning light come on?

PREPARATION:(a) Disconnect negative (-) terminal cable from the battery.(b) Connect the airbag sensor assembly connector.(c) Connect negative (-) terminal cable to battery, and wait

at least 2 seconds.(d) Turn the ignition switch to ACC or ON.CHECK:Check operation of SRS warning light.

NO Check terminal LA of airbag sensor assembly.If normal, replace airbag sensor assembly.

YES



830Author: Date:

1997 SUPRA (RM502U)

5 Is new ECU-B fuse burnt out again?

NO Using simulation method, reproduce malfunc-tion symptoms (See page IN-18 ).

YES

Check harness between ECU- B fuse andSRS warning light.

H03189


Tc7

21II1

113

TcE1

DLC1

BR P-B7

1E 1G

Junction Block No.1

P-B

R (*1)P-B (*2)

3

11IF1RTcE1

DTC2

BR18IJ1BR

BR

ED

*1: 2JZ-GE*2: 2JZ-GTE

R-B

43

P-B


831Author: Date:

1997 SUPRA (RM502U)

Tc Terminal Circuit

CIRCUIT DESCRIPTIONBy connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.The DTCs are displayed by the blinking of the SRS warning light.

WIRING DIAGRAM

DI4WU-02

H03186

ACC ON

or

LOCK

AB0118

R14305

AB0119H00030

ACC ON

or

(-)

DLC 1

(+)

TcE1


832Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDURESHINT:If the DTC is not displayed, perform the following troubleshooting.

1 Does SRS warning light light up for approx. 6 seconds?

CHECK:Check operation of SRS warning light after ignition switch isturned from LOCK position to ACC or ON position.

NO Check SRS warning lights system(See page DI-557 ).

YES

2 Check voltage between terminals Tc and E 1 of DLC1.

PREPARATION:Turn the ignition switch to ACC or ON.CHECK:Measure the voltage between terminals Tc and E1 of DLC1.OK:

Voltage: 10 - 14 V

OK Go to step 4.

NG

AB0118R14304

AB0119H00031

ACC ON

or

(-)

DLC 1

(+)

Tc


833Author: Date:

1997 SUPRA (RM502U)

3 Check voltage between terminal Tc of DLC1 and body ground.

CHECK:Measure the voltage between terminals Tc of DLC1 and bodyground.OK:

Voltage: 10 - 14 V

OK Check harness between terminal E 1 of DLC1and body ground.

NG

AB0117 AB0118 AB0119

W02763 H00049

LOCK


Tc

ACC ON

or


834Author: Date:

1997 SUPRA (RM502U)



and wait at least 90 seconds.(c) Remove the steering wheel pad. (See SR section)(d) Disconnect the connector of front passenger airbag as-

sembly. (See page RS-21 )(e) Disconnect the connector of airbag sensor assembly.

(See page RS-33 )(f) Insert the service wire into terminal Tc from back side as

shown.(g) Connect the airbag sensor assembly connector with ser-

vice wire.(h) Connect negative (-) terminal cable to battery.(i) Turn the ignition switch to ACC or ON, and wait at least

20 seconds.(j) Connect the service wire of terminal Tc to body ground.CHECK:Check operation of SRS warning light.OK:

SRS warning light comes on.NOTICE:Never make a mistake with the terminal connection posi-tion as this will cause a malfunction.

OK Check harness between airbag sensor assem-bly and DLC1.

NG


AB0117W02764 H00050

LOCK


(-)

Tc

(+)


835Author: Date:

1997 SUPRA (RM502U)

If the DTC is displayed without a DTC check procedure, perform the followingtroubleshooting.

1 Check resistance between terminal Tc of airbag sensor assembly and bodyground.


and wait at least 90 seconds.(c) Disconnect the airbag sensor assembly connector.CHECK:Check the resistance between terminal Tc of airbag sensor as-sembly connector and body ground.OK:



OK


DI4WV-01

Customer Problem Analysis


Problem Symptom ConfirmationSymptom SimulationProbkem does not occur

Matrix Chart of Problem Symptoms

Circuit Inspection


Repair

Confirmation Test

End

Titles inside are titles of pages in thismanual, with the page number indicated inthe bottom portion. See the indicated pagesfor detailed explanations.1

23

4

5

7

Step 5, 7 : Diagnostic steps permitting the useof the TOYOTA hand-held tester orTOYOTA break-out-box.

P. DI-609

P. DI-615

P. IN-18

P. DI-617

Problem occurs

6

DI-608-DIAGNOSTICS THEFT DETERRENT SYSTEM

836Author: Date:

1997 SUPRA (RM502U)

THEFT DETERRENT SYSTEMHOW TO PROCEED WITH TROUBLESHOOTINGHINT:Troubleshooting of the theft deterrent system is based on the premise that the door lock control system isoperating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain thatthe door lock control system is operating normally.For troubleshooting using a volt/ohm meter, see page DI-615 .Be sure to use troubleshooting procedure appropriate to the diagnostic tool being used.Perform troubleshooting in accordance with the procedure on the following page.

DI4WW-01

THEFT DETERRENT SYSTEM Check Sheet Inspector’s name:

Customer’s Name

Date of Vehicle

Registration No.

Registration Year

Frame No.

Odometer Reading / / kmMile

Weather ConditionsWhen ProblemOccurred


Weather

Outdoor temperature

/ /

Constant Sometimes ( Times per day, month) Once only

Brought in

Theft deterrent system cannot be set.

Indicator light does not flash when the theft deterrent system is set. (It stays on or does not light at all.)

Theft deterrent system does not operate.

When unlocked using the door lock knob. When the engine hood is opened.

System cannot be canceled once set.

When door is unlocked using key or wireless door lock control system. When the key is inserted in the ignition key cylinder and turned to ACC or ON position. (However, only when the system has never operated) When the luggage compartment door is opened with the key.

System cannot be canceled during warning operation.

When door is unlocked using key or wireless door lock control system. When the key is inserted in the ignition key cylinder and turned to ACC or ON position.

Warning operation starts when the system is set and the door or luggage compartment door is opened with the key.

Others.


Fine Cloudy Rainy Snowy Various/Others

Hot Warm Cool Cold (Approx. °F ( °C))

Pro

blem

Sym

ptom

Malfunction Horns only Theft deterrent horn only Headlights only Taillights only Starter cut only Door lock operation only

-DIAGNOSTICS THEFT DETERRENT SYSTEMDI-609

837Author: Date:

1997 SUPRA (RM502U)


DI4WX-01


838Author: Date:

1997 SUPRA (RM502U)

PRE-CHECK1. Setting Conditions:

SETTING OF THE THEFT DETERRENT SYSTEM(a) Close all the doors.(b) Close the engine hood and luggage compartment door.(c) Remove the ignition key from the ignition key cylinder.2. Setting Operation:

SETTING OF THE THEFT DETERRENT SYSTEMWhen any of the following operations (a) or (c) is done, the theft deterrent indicator light will light up as de-scribed.

(1) Lock the left or right front door using the key. (All doors are locked by key-interlinked lock opera-tion)

(2) With the rear doors locked and with one of the front doors locked, lock the other front door withoutusing the key (keyless door lock).

Elapsed time after operation Indicator light

Within about 30 seconds Light up

After about 30 seconds Blinks *1

*1: 1 sec. on, 1 sec. offHINT:When the theft deterrent system is set, doors cannot be locked or unlocked with the door lock control switchand the luggage compartment door cannot be unlocked with the luggage compartment door opener switch.3. Cancelling Operation:

CANCELING OF THE THEFT DETERRENT SYSTEM IN THE SET CONDITIONHINT: Check if the theft deterrent indicator light is blinking. When any of the following operation (a), (b), (c) or (d) is done, the theft deterrent system is canceled

and indicator light will go off.(a) Unlock the left or right front door using the key.(b) Insert the ignition key in the ignition key cylinder and turn it to the ACC or ON position. (This is operative

only when the theft deterrent system has never operated.)(c) Unlock the luggage compartment door with the key. *1

*1: The theft deterrent systems is temporarily canceled only while the luggage compartment door is open.Approximately 2 seconds after the luggage compartment door is closed, the theft deterrent system is reset.

N09348

TOYOTAhand-held tester

TOYOTAbreak-out-box

ECU

-DIAGNOSTICS THEFT DETERRENT SYSTEMDI-61 1

839Author: Date:

1997 SUPRA (RM502U)

4. CHECK OF THE THEFT DETERRENT SYSTEM OPERATION.HINT:Check if the theft deterrent indicator light is blinking.When any of the following operations (a) or (b) is done, the system sounds the horns as theft deterrent hornand flashes the headlights and taillights for about one minute to alert. At the same time, the system discon-nects the starter motor circuit and locks all doors (if all doors are not locked, the system repeats door lockingoperation every 2 seconds during the one minute alert time).(a) Open the engine hood using the engine hood opener lever.(b) Unlock any of the front or rear doors without key operation.5. CANCELING OF THE THEFT DETERRENT SYSTEM IN OPERATING CONDITION.The theft deterrent operation can be cancelled when any of the following conditions is met:

No. Condition Cancelling Operation

1 Unlock left or right door with the key.

2 Unlock doors with wireless door lock control system.

3 Insert key into ignition key cylinder and turn it to the ACC or ON position. *2

4 About 1 minute passes after theft deterrent operation begins. Automatic stop*1

*1: In this case, the theft deterrent system resets in about 2 seconds if all doors are closed.*2: The alarm will be off, but the engine will not operate. To restart the engine, see No.1

6. ECU TERMINAL VALUES MEASUREMENT USINGTOYOTA BRAKE-OUT-BOX AND TOYOTA HAND-HElD TESTER

(a) Hook up the TOYOTA brake- out- box and TOYOTAhand-held tester to the vehicle.

(b) Read the ECU input/output values by following theprompts on the hand-held tester screen.

HINT:TOYOTA hand-held tester has a ”Snapshot” function. This re-cords the measured values and is effective in the diagnosis ofintermittent problems.Please refer to the TOYOTA hand-held tester/TOYOTA break-out-box operator’s manual for further details.

DI4WY-01

I02535

Theft Deterrent Horn

R/B No.2 Headlight Relay Horn Relay Starter Relay

Engine Hood CourtesySwitch

Horn

Theft Deterrent Horn(2JZ-GTE) (2JZ-GE)

Theft Deterrent and DoorLock ECU

Door Key Lock and UnlockSwitch

Door Lock Control Switch

Door Lock Motor and Door UnlockDetection Switch

Door Courtesy Switch

Luggage Room Light Switch

Door Key Lock and UnlockSwitch

Door Lock Control Switch

Back Door Key Unlock Switch

(Power Window Master Switch)


840Author: Date:

1997 SUPRA (RM502U)

PARTS LOCATION

DI4WZ-01

I02536

3

25

2 1

9 7 6 411 10

2423 188 5

22212019 1716151413 12

9 8 7 6 5 4 3 2 1

T13T7Theft Deterrent and Door Lock Control ECU


841Author: Date:

1997 SUPRA (RM502U)

TERMINALS OF ECM

Terminals Symbols Condition Standard Value

+B2 ↔ Ground

(T7-9 ↔ Ground)L-W ↔ Ground Always. 10 - 14 V

ACT- ↔ ACT+ (T7-2 ↔ T7-3) L-Y ↔ L-R Ignition switch is turned to ”OFF” position. Below 50Ω

RLY ↔ Ground

(T7-6 ↔ Ground)Y ↔ Ground Ignition switch is turned to ”ON” position. 10 - 14 V

IG ↔ Ground

(T7-7 ↔ Ground)B-R ↔ Ground Ignition switch is turned to ”ON” position. 10 - 14 V

ACC ↔ E (T7-8 ↔ T7-4) L-R ↔ W-B Ignition switch is turned to ”ACC” position. 10 - 14 V

+B1 ↔ Ground

(T13-1 ↔ Ground)R ↔ Ground Always. 10 - 14 V

DSWL E (T13 4 T7 4) LG W BLuggage compartment door courtesy switch ON (door opened). Below 1 Ω

DSWL ↔ E (T13-4 ↔ T7-4) LG ↔ W-BLuggage compartment door courtesy switch OFF (door closed). 1 MΩ or higher

L1 E (T13 5 T7 4) R W W BDoor lock control switch ”lock” position. Below 1 Ω

L1 ↔ E (T13-5 ↔ T7-4) R-W ↔ W-BDoor lock control switch OFF or ”unlock” position. 1 MΩ or higher

UL3 E (T13 6 T7 4) G W BDoor key lock and unlock switch ”unlock” position. Below 1Ω

UL3 ↔ E (T13-6 ↔ T7-4) G ↔ W-BDoor key lock and unlock switch OFF or ”lock” position. 1MΩ or higher

DSWD E (T13 7 T7 4) R B W BDoor open detection switch (driver’s) ON (door opened). Below 1Ω

DSWD ↔ E (T13-7 ↔ T7-4) R-B ↔ W-BDoor open detection switch (driver’s) OFF (door closed). 1MΩ or higher

UL1 E (T13 8 T7 4) G R W BDoor lock control switch ”unlock” position. Below 1Ω

UL1 ↔ E (T13-8 ↔ T7-4) G-R ↔ W-BDoor lock control switch OFF or ”lock” position. 1MΩ or higher

LUG E (T13 9 T7 4) L W BLuggage compartment door key lock and unlock switch ON. Below 1Ω

LUG ↔ E (T13-9 ↔ T7-4) L ↔ W-BLuggage compartment door key lock and unlock switch OFF. 1MΩ or higher

HEAD ↔ E (T13-10↔ T7-4) R-Y ↔ W-B Light control switch other than ”HEAD” position. 10 - 14 V

SH ↔ E (T13-11 ↔ T7-4) P-B ↔ W-B Always. 10 - 14 V

IND ↔ Ground

(T13-12 ↔ Ground)W-L ↔ Ground Always. Below 270 Ω

DSWH E (T13 14 T7 4) G R W BEngine hood courtesy switch ON (hood opened). Below 1Ω

DSWH ↔ E (T13-14 ↔ T7-4) G-R ↔ W-BEngine hood courtesy switch OFF (hood closed). 1MΩ or higher

LSWD E (T13 15 T7 4) L W W BDoor unlock detection switch ON (door opened). Below 1Ω

LSWD ↔ E (T13-15 ↔ T7-4) L-W ↔ W-BDoor unlock detection switch OFF (door closed). 1MΩ or higher

UL2 E (T13 16 T7 4) W W BDoor key lock and unlock switch ”unlock” position. Below 1Ω

UL2 ↔ E (T13-16 ↔ T7-4) W ↔ W-BDoor key lock and unlock switch OFF or ”lock” position. 1MΩ or higher

DSWP E (T13 19 T7 4) R L W BDoor open detection switch (passenger’s) ON (door opened). Below 1Ω

DSWP ↔ E (T13-19 ↔ T7-4) R-L ↔ W-BDoor open detection switch (passenger’s) OFF (door closed). 1MΩ or higher

KSW E (T13 20 T7 4) Y W BKey unlock warning switch ON. Below 1Ω

KSW ↔ E (T13-20 ↔ T7-4) Y ↔ W-BKey unlock warning switch OFF. 1MΩ or higher


842Author: Date:

1997 SUPRA (RM502U)

LSWP E (T13 21 T7 4) G B W BDoor unlock detection switch ON (door opened). Below 1Ω

LSWP ↔ E (T13-21 ↔ T7-4) G-B ↔ W-BDoor unlock detection switch OFF (door closed). 1MΩ or higher

L2 E (T13 22 T7 4) G Y W BDoor key lock and unlock switch ”lock” position. Below 1Ω

L2 ↔ E (T13-22 ↔ T7-4) G-Y ↔ W-BDoor key lock and unlock switch OFF or ”unlock” position. 1MΩ or higher

TAIL ↔ E (T13-23 ↔ T7-4) G-W ↔ W-B Light control switch ”TAIL” position. 10 - 14 V

HORN ↔ E (T13-24 ↔ T7-4) L-R ↔ W-B Horn switch OFF. 10 - 14 V

SRLY ↔ Ground

(T13-25 ↔ Ground)L-O ↔ Ground

Ignition switch is turned to ”ST” position.

(When park/neutral position switch ”P” position.)10 - 14 V

DI4X0-01


843Author: Date:

1997 SUPRA (RM502U)

PROBLEM SYMPTOMS TABLE

Proceed to the reference page shown in the matrix chart below for each malfunction symptom and trouble-shoot for each circuit.HINT:Troubleshooting of the theft deterrent system is based on the premise that the door lock control system isoperating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain thatthe door lock control system is operating normally.

Theft Deterrent System:

Details of Problem Inspecting Circuit *1 See page

1. Indicator light circuit DI-617

2. Luggage compartment door key lock and unlock switch

circuitDI-633

The theft deterrent system cannot be set3. Luggage compartment door courtesy switch circuit DI-636

4. Door courtesy switch circuit DI-640

5. Engine hood courtesy switch circuit DI-642

The indicator light does not blink when system is set Indicator light circuit DI-617

When the system is set

When the back door is opened by a method other than the key

The system does not operate

Luggage compartment door courtesy switch circuit DI-636


When the engine hood is opened

The system does not operate

Engine hood courtesy switch circuit DI-642

While the system is in warning operation

Horns do not soundHorn relay circuit DI-621


Theft deterrent horn does not soundTheft deterrent horn circuit DI-623


Headlights do not flashHeadlight control relay circuit DI-626


Taillights do not flashTaillight control relay circuit DI-628


The starter cut is not cut offStarter relay circuit DI-619


It is not canceled when the ignition key is turned to ACC or ON

position

Ignition switch circuit DI-630


It still operates when the back door is opened with the key

Luggage compartment door key lock and unlock switch

circuitDI-633

System is still set even when a rear door is open Door courtesy switch circuit DI-640

Even when the system is not set

Horns soundHorn relay circuit DI-621


Theft deterrent horn soundsTheft deterrent horn circuit DI-623


Headlights stay onHeadlight control relay circuit DI-626


Taillights stay onTaillight control relay circuit DI-628

*1: If numbers are given to the circuit proceed with troubleshooting in the order indicated by those numbers.


844Author: Date:

1997 SUPRA (RM502U)

Door Lock System:

Trouble Suspect Area See page

Whole function of the door lock control system does not operate.

1. ECU Power Source Circuit

2. Actuator Power Source Circuit

3. Door Lock Motor Circuit

4. Theft Deterrent and Door Lock Control ECU

DI-644

DI-647

DI-650

DI-623

All doors or some doors are not locked and unlocked with the

door lock control switch and key lock and unlock switch.

1. Door Lock Control Switch Circuit

2. Door key Lock and Unlock Switch Circuit

3. Door Lock Motor Circuit


DI-653

DI-656

DI-650

DI-623

Doors cannot be locked with the door lock control switch. (Doors

lock and unlock normally with the key lock and unlock switch.)

1. Door Lock Control Switch Circuit

2. Key Unlock Warning Switch Circuit

3. Door Courtesy Switch Circuit


DI-653

DI-658

DI-640

DI-623

Doors are not locked or unlocked with the door key lock and un-

lock switch. (Doors lock and unlock normally with the door lock

control switch.)

1. Door Key Lock and Unlock Switch Circuit

2.Theft Deterrent and Door Lock Control ECU

DI-656

DI-623

Key confinement prevention function does not operate. (Doors

lock and unlock normally with the door key lock and unlock

switch.)

1. Key Unlock Warning Switch Circuit

2. Door Unlock Detection Switch CIrcuit


DI-658

DI-638

DI-623

DI4X1-01

I02537

Indicator Light(Telltale Light LH)

Theft Deterrent andDoor Lock ECU

W-LW-B 912

IE

J/B No.1

1 1J

IE

T13

10 IND

18


845Author: Date:

1997 SUPRA (RM502U)

CIRCUIT INSPECTION

Indicator Light Circuit

CIRCUIT DESCRIPTIONWhen the theft deterrent system is preparing to set, this circuit lights up the indicator light. When the systemhas been set, it continually turns the indicator light on for 1 second and turns it off for 1 second, thus blinkingthe indicator light.

WIRING DIAGRAM

I02538

10 (+)

9 (-)


846Author: Date:

1997 SUPRA (RM502U)


1 Check indicator light.

PREPARATION:(a) Remove instrument panel cluster finish panel.(b) Disconnect telltale light RH connector.CHECK:Connect positive lead to terminal 10 and negative lead toterminal 9 of indicator light connector.OK:

Indicator light comes on.

NG Replace telltale light RH.

OK

2 Check harness and connector between theft deterrent and door lock ECU andindicator light, indicator light and body ground (See page IN-28 ).


OK

Check and replace theft deterrent and doorlock ECU. * 1

*1: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numberedcircuit inspection shown on matrix chart (See page DI-615 ).

N19900

1K

1J

IJ2 P2 P2

C9 C9 IJ1 EA1 2 2

2

IB2 IF2

I19 I19 IB1

2

2A

S2S3

4

6

8 7

B

13 6 5

1 2 2 3 1 2

3 5

10


EA2

EA3

4

Starter Relay

MAIN

L-O SRLY25

Clutch Start Switch(M/T)

2 1AM2

J/B No.1ST

R/B No.2

21

2JZ-GTE2JZ-GE

Battery

12

BB L-OL-O

B-W

B-W W-R

W-R

W-B

B

BB

1

IgnitionSwitch

T13Park/Neutral Start Switch

11

B

(A/T)

12


847Author: Date:

1997 SUPRA (RM502U)

Starter Relay Circuit

CIRCUIT DESCRIPTIONWhen the theft deterrent system is activated, contact ”a” in the ECU becomes open, creating an open circuitin terminal ST circuit and making the starter inoperative (starter cut).In this condition, if one of the following operations is done, the contact ”a” in the ECU is grounded, thus can-celing the starter cut:

(1) The front LH and RH door is unlocked with a key.

WIRING DIAGRAM

DI4X2-01

I02540

START

Disconnect

SPLY (+)


848Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDUREHINT:This troubleshooting is based on the premise that engine cranking occurs.If the engine does not crank, proceed to the engine troubleshooting on page DI-3 or DI-141 (Vol. 1).

1 Check voltage between terminal SRLY of theft deterrent and door lock ECU con-nector and body ground.

PREPARATION:(a) Remove the instrument panel. (See page BO-50 )(b) Disconnect the ECU connector.CHECK:Measure voltage between terminal SRLY of theft deterrent ECUconnector and body ground, when ignition switch is turned toST position.OK:

Voltage: 10 - 14 V

OK Check and replace theft deterrent ECU.

NG

Check and repair harness and connector between starter and theft deterrent and door lock ECU(See page IN-28 ).

I02710I02710


R/B No.2

HORN Relay

R/B No2.

Horn Switch

Horn

L-R

L-BHAZ-HORN

Battery

HORN

L-B

L-RL-RW 2 2

2

2

2

2A1

1

1 1

16 14

L-RL-B3

IB2 IF2 24

B

T13


849Author: Date:

1997 SUPRA (RM502U)

Horn Relay Circuit

CIRCUIT DESCRIPTIONWhen the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off in approximately0.2 sec. cycles. This switches the horn relay on and off, thus the horn blow (See the wiring diagram below).In this condition, if any of the following operations is done, the Tr in the ECU goes off and the horn relayswitches off, thus the horns stop blowing:

(1) The front LH or RH door is unlocked with a key.(2) The ignition switch is turned to the ACC or ON position.(3) Approximately 1 minute elapses.

WIRING DIAGRAM

DI4X3-01

I02711

LOCK

Disconnect

HORN (+)


850Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminal HORN of theft deterrent and door lock ECU con-nector and body ground.

PREPARATION:(a) Remove the instrument panel. (See page BO-50 ).(b) Disconnect the ECU connector.CHECK:Measure voltage between terminal HORN of theft deterrentECU connector and body ground.OK:

Voltage : 10 - 14 V

OK Check and replace theft deterrent and door lockECU.

NG

Check and repair harness and connector between theft deterrent and door lock ECU and hornrelay (See page IN-28 ).

N09783

2

2A

EA1 II1

IB6 IF219 6

227

1 2

1

Battery

R/B No.2HAZ-HORN

W(2JZ-GE)


T13

(2JZ-GE)

11(2JZ-GTE)

Theft DeterrentHorn

(2JZ-GTE)

B

P-B

W

W W-L W-L

SHa

b

P-B

W-L


851Author: Date:

1997 SUPRA (RM502U)

Theft Deterrent Horn Circuit

CIRCUIT DESCRIPTIONWhen the theft deterrent system is activated, contact ”a” and contact ”b” in the ECU close alternately in cyclesof approximately 0.2 sec., causing the theft deterrent horn to blow (See the wiring diagram below).In this condition, if any of the following operations is done, the contact ”a” in the ECU opens, thus stoppingthe theft deterrent horn from blowing:


WIRING DIAGRAM

DI4X4-01

I02542

LOCK

Disconnect

2JZ-GE

2JZ-GTE

2 (+)

2 (+)

N14682

1 (+)

2 (-)


852Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminal SH of theft deterrent horn connector and bodyground.

PREPARATION:Remove the theft deterrent horn and disconnect the connector.CHECK:Measure voltage between terminal 1 of theft deterrent hornconnector and body ground.OK:

Voltage : 10 - 14 V

NG Check and repair harness and connector be-tween HORN fuse and theft deterrent horn.

OK

2 Check theft deterrent horn.

CHECK:Connect positive lead to terminal 1 and negative lead toterminal 2 of theft deterrent horn connector.OK:

Theft deterrent horn blows.

NG Replace theft deterrent horn.

OK


853Author: Date:

1997 SUPRA (RM502U)

3 Check harness and connector between theft deterrent and door lock ECU andtheft deterrent horn (See page IN-28 ).


OK

Check and replace theft deterrent ECU.

I02543


*1: USA Models*2: CANADA Models

Battery

R/B No.2HEAD(LH)*1HEAD(LH-L WR)*2

HEAD

R/B No.2

FL MAIN

Light ControlSwitch

R/B No.2HEAD(RH)*1HEAD(RH-L WR)*2

R-YR-YR-YR-Y

R-G R-B

W-B

W-B

B

R

R2

2

2

2

2

22

2

1 1

1

14

2

310

1613IB2 IF22A

EA

Headlight Relay

T13


854Author: Date:

1997 SUPRA (RM502U)

Headlight Control Relay Circuit

CIRCUIT DESCRIPTIONWhen the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately0.2 sec. intervals. This switches the headlight control relay on and off, thus flashing the headlights (See thewiring diagram below).In this condition, if any of the following operations is done, the Tr in the ECU goes off and the headlight controlrelay switches off, thus stopping the headlights flashing:


WIRING DIAGRAM

DI4X5-01

I02544

LOCK

Disconnect

HEAD (+)


855Author: Date:

1997 SUPRA (RM502U)

INSPECTION PROCEDUREHINT:The flow chart below is based on the premise that the headlights light up normally whenever the light controlswitch is operated. If headlight operation is not normal when the light control switch is operated, proceedto troubleshooting on page BE-2 .

1 Check voltage between terminal HEAD of theft deterrent and door lock ECU con-nector and body ground.

PREPARATION:(a) Remove the instrument panel. (See page BO-50 )(b) Disconnect the ECU connector.CHECK:Measure voltage between terminal HEAD of theft deterrentECU connector and body ground.OK:

Voltage: 10 - 14 V


NG

Check and repair harness and connector between theft deterrent and door lock ECU and head-light control relay (See page IN-28 ).

I02545I02545


T13

IF2

2

2

2A

2

2

J/B No.1

1B 1K

1C

LGLG

G-W

G-W G-WTAIL11

16

35

TAIL

1W-L

W-B

Ta i lLight

W-B

W-B

1 1

9

3

B

Battery

LightFailureSensor

Light Control Switch

15

23

G

Taillight Control Relay

B1 BJ

ALT

PO

WE

R

W

1 5 5

2


856Author: Date:

1997 SUPRA (RM502U)

Taillight Control Relay Circuit

CIRCUIT DESCRIPTIONWhen the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately0.2 sec. intervals. This switches the taillight control relay on and off, thus the taillights flash (See the wiringdiagram below).In this condition, if any of the following operations is done, the Tr in the ECU goes off and the taillight controlrelay switches off, thus stopping the taillights flashing:


WIRING DIAGRAM

DI4X6-01

I02546

LOCK

Disconnect

TAIL (+)


857Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminal TAIL of theft deterrent door lock ECU connectorand body ground.

PREPARATION:(a) Remove the instrument panel. (See page BO-50 )(b) Disconnect the ECU connector.CHECK:Measure voltage between terminal TAIL of theft deterrent anddoor lock ECU connector and body ground.OK:

Voltage: 10 - 14 V

OK Check and replace theft deterrent ECU.

NG

Check and repair harness and connector between theft deterrent and door lock ECU and taillightcontrol relay (See page IN-28 ).

I02547

Theft Deterrent andDoor Lock ECUJ/B No.1Ignition Switch

R/B No.2

R/B No.2

Battery

AM

1A

LT

4CIG

W

T7

J/B No.1

W

4

42

328

5 8

7

171B1J2

2

2

12A

W

B

ACCL-R

B-R

P-L

B-Y IG

1E

1E

1J1J ECU-IG


858Author: Date:

1997 SUPRA (RM502U)

Ignition Switch Circuit

CIRCUIT DESCRIPTIONWhen the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACCof the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to theterminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of theECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from theterminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.

WIRING DIAGRAM

DI4X7-01

N08843

N14677I04612

ECU-IG CIG

Junciton Block No.1


859Author: Date:

1997 SUPRA (RM502U)


1 Check CIG and ECU-IG fuses.

PREPARATION:Remove CIG and ECU-IG fuses from J/B No.1.CHECK:Check continuity of CIG and ECU-IG fuses.OK:

Continuity

NG Check for short in all the harness and compo-nents connected to the CIG and ECU-IG fuses(See attached wiring diagram).

OK

I02548

ON

Disconnect

IG (+) ACC (+)


860Author: Date:

1997 SUPRA (RM502U)

2 Check voltage between terminals IG and ACC of theft deterrent and door lockECU and body ground.

PREPARATION:(a) Remove the instrument panel. (See page BO-50 )(b) Disconnect the ECU connector.(c) Turn the ignition switch ON.CHECK:Measure voltage between terminals IG and ACC of theft deter-rent ECU connector and body ground.OK:

Voltage: 10 - 14 V


NG

Check and repair harness and connector between theft deterrent and door lock ECU and battery(See page IN-28 ).

I02552

Luggage Compartment DoorCourtesy Switch


8LG

IE1DSWL

4

12V

1

T13

LG


864Author: Date:

1997 SUPRA (RM502U)

Luggage Compartment Door Courtesy Switch Circuit

CIRCUIT DESCRIPTIONThe luggage compartment door courtesy switch goes on when the back door is opened and goes off whenthe back door is closed.

WIRING DIAGRAM

DI4X9-01


865Author: Date:

1997 SUPRA (RM502U)


1 Check operation of luggage room light.

CHECK:Check that luggage room light goes off when luggage room light switch is pushed, and comes on when switchis not pushed.

NG Check and repair luggage compartment doorcourtesy light circuit (See page DI-636 ).

OK

2 Check for open in harness and connector between theft deterrent and door lockECU and luggage compartment door courtesy switch (See page IN-28 ).

NG Repair or replace harness or connectors.

OK

Check and replace theft deterrent ECU. * 1


I02553

Door Lock Motor and UnlockDetection Switch RH


Door Lock Motor and UnlockDetection Switch LH

W-B W-B

L-Y

LSWDL-W

L-WW-B

IH

IE

IL1

IJ ID

IL1

ID1

8

211

1

6

15

1 10

164 2

3

2 4

12V

12V

T13

3W-B

G-BG-B

LSWP


866Author: Date:

1997 SUPRA (RM502U)

Door Unlock Detection Switch Circuit

CIRCUIT DESCRIPTIONThe door unlock detection switch goes off when the door lock knob is operated to the lock position, andcomes on when the door lock knob is operated to the unlock position.

WIRING DIAGRAM

DI4XA-01

I02554

Disconnect

1

3


867Author: Date:

1997 SUPRA (RM502U)


1 Check door unlock detection switch.

PREPARATION:(a) Remove the door trim.(b) Disconnect door lock motor and door unlock detection

switch connector.CHECK:Check continuity between terminals 1 and 3 of door unlockdetection switch connector, when door lock knob is operated tothe lock side and to the unlock side.OK:

Switch condition Terminal No. to continuity

Door unlock 1 - 3

Door lock -

NG Replace door unlock detection switch.

OK

2 Check harness and connector between theft deterrent and door lock ECU anddoor unlock detection switch, door unlock detection switch and body ground(See page IN-28 ).


OK

Check and replace theft deterrent and doorlock ECU. * 1


I02555

Door Courtesy Switch LH

Door CourtesySwitch RH


W-B R-B R-B R-B DSWD

DSWPR-LR-LW-B

2 33

324

7

15

19

IC2 IF2

IF3

12V

12V

T13

BI

IG


868Author: Date:

1997 SUPRA (RM502U)

Door Courtesy Switch Circuit

CIRCUIT DESCRIPTIONThe door courtesy switch goes on when the door is opened and goes off when the door is closed.

WIRING DIAGRAM

DI4XB-01


869Author: Date:

1997 SUPRA (RM502U)


1 Check operation of open door warning light.

CHECK:Check that open door warning light comes on when each door is opened, and goes off when all doors areclosed.

NG Check and repair open door warning lightcircuit.

OK

2 Check for open in harness and connector between theft deterrent and door lockECU and door courtesy switch (See page IN-28 ).

OK Check and replace theft deterrent ECU. * 1

NG

Repair or replace harness or connector.


I02556

Engine Hood CourtesySwitch


W-B

GR

DSWHGR

14

12V

GR

EA

IB6 IF32 14 9

T13


870Author: Date:

1997 SUPRA (RM502U)

Engine Hood Courtesy Switch Circuit

CIRCUIT DESCRIPTIONThe engine hood courtesy switch is built into the engine hood lock assembly and goes on when the enginehood is opened and goes off when the engine hood is closed.

WIRING DIAGRAM

DI4XC-01

I02557

1

2

Disconnect


871Author: Date:

1997 SUPRA (RM502U)


1 Check engine hood courtesy switch.

PREPARATION:(a) Remove engine hood lock assembly.(b) Disconnect engine hood courtesy switch connector.CHECK:Check continuity between terminals 1 and 2 when engine hoodlock is locked and unlocked.OK:

Engine hood lock Terminal No. to continuity

Lock -

Unlock 1 - 2

NG Replace engine hood courtesy switch.

OK

2 Check harness and connector between theft deterrent and door lock ECU andswitch, switch and body ground (See page IN-28 ).


OK

Check and replace theft deterrent and doorlock ECU (See page IN-28 ).

I02549

Luggage Compartment DoorKey Lock and Unlock Swich

Theft Deterrent and Door Lock ECU

LUGIE1

W-B

BJ

1 L4

L9

12V

T13

2


861Author: Date:

1997 SUPRA (RM502U)

Luggage Compartment Door Key Lock and Unlock SwitchCircuit

CIRCUIT DESCRIPTIONThe luggage compartment door key lock and unlock switch goes on when the back door key cylinder isturned to the unlock side with the key.

WIRING DIAGRAM

DI4X8-01

I02550

1 (+)

ON

Connect

I02551

Disconnect

12


862Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminal 1 of luggage compartment door key lock andunlock switch connector and body ground.

PREPARATION:(a) Remove deck trim rear cover.(b) Turn the ignition switch ON.CHECK:Measure voltage between terminal 1 of luggage compartmentdoor key lock and unlock switch connector and body ground,when the key is turned to the unlock side and not turned.OK:

Key operation Voltage

Turned to the unlock side 0 V

Not turned Battery positive voltage

OK Check and replace theft deterrent and door lockECU. *1

NG

2 Check luggage compartment door key lock and unlock switch.

PREPARATION:Disconnect luggage compartment door key lock and unlockswitch connector.CHECK:Check continuity between terminals 1 and 2, when the key isturned to the unlock side and not turned.OK:

Key position Terminal No. to continuity

Turned to unlock side 1 - 2

Not turned -

NG Repair or replace luggage compartment doorkey lock and unlock switch.

OK


863Author: Date:

1997 SUPRA (RM502U)

3 Check harness and connector between theft deterrent and door lock ECU andkey unlock switch, key unlock switch and body ground (See page IN-28 ).


OK

Check and replace theft deterrent and doorlock ECU.


I02558I02558


Battery

R/B No.2 J/B No.1

DOME R +B1

W-B E4

1

R512

B

2A 1B 1E11

IH

T13

T7


872Author: Date:

1997 SUPRA (RM502U)

ECU Power Source-Circuit

CIRCUIT DESCRIPTIONThis circuit provides power to operate the theft deterrent and door lock ECU.

WIRING DIAGRAM

DI4XD-01

N09001

Relay Block No.2

DOME Fuse


873Author: Date:

1997 SUPRA (RM502U)


1 Check DOME fuse.

PREPARATION:Remove DOME fuse from R/B No.2.CHECK:Check continuity of DOME fuse.OK:

Continuity

NG Check for short in all the harness and compo-nents connected to the DOME fuse(See attached wiring diagram).

OK

I02559

LOCK

E (-) +B1 (+)


874Author: Date:

1997 SUPRA (RM502U)

2 Check voltage between terminals +B1 and E of ECU connector.

PREPARATION:(a) Remove the No.1 under cover and heater duct.(b) Disconnect the theft deterrent and door lock ECU con-

nectors.CHECK:Measure voltage between terminals +B1 and E of ECU connec-tor.OK:

Voltage: 10 - 14 V

OK Proceed to next circuit inspection shown onmatrix chart (See page DI-615 ).

NG

3 Check for open in harness and connector between ECU and body ground (See page IN-28 ).


OK

Check and repair harness and connector be-tween ECU and battery (See page IN-28 ).

I02560

J/B No.1 DOOR FuseTheft Deterrent andDoor Lock ECU

Door Lock Motor

T7

12VL-W L-W +B2

9

13IF1

W-L

R/B No.2

R/B No.2

PO

WE

RA

LT

B

W

Battery

1B 1H2 15

2

2

2

2A1


875Author: Date:

1997 SUPRA (RM502U)

Actuator Power Source Circuit

CIRCUIT DESCRIPTIONThis circuit provides power to drive the door lock motor.

WIRING DIAGRAM

DI4XE-01

N09001

Relay Block No.2

POWER M-Fuse


876Author: Date:

1997 SUPRA (RM502U)


1 Check POWER M-fuse.

PREPARATION:Remove POWER M fuse from R/B No.2.CHECK:Check continuity of POWER M-fuse.OK:

Continuity

NG Check for short in all the harness and compo-nents connected to the DOOR fusible link (See attached wiring diagram). * 1

OK

I02561

LOCK

+B2 (+)


877Author: Date:

1997 SUPRA (RM502U)

2 Check voltage between terminal +B2 of ECU connector and body ground.

PREPARATION:(a) Remove the instrument panel. (See page BO-50 )(b) Disconnect the ECU connector.CHECK:Measure voltage between terminal +B2 of ECU connector andbody ground.OK:

Voltage: 10 - 14 V


NG

Check and repair harness and connector be-tween ECU and battery (See page IN-28 ).

*1: The power source is supplied to the actuator (door lock motor, through the theft deterrent and door lockECU. Accordingly, if a short circuit of the W/H or actuator occurs in the actuator circuit the POWER M-Fusemay become OPEN, so also inspect the actuator (door lock motor circuit on page DI-647 ).

I02562

Door Lock Motor RH

Door Lock Motor LH


L-Y

L-Y L-Y

L-Y L-R

L-R L-R

L-R ACT+

3

12V

12VACT-

2L-Y

T7

12IL1 2 4

11IL1

5ID1

16ID1

4 2


878Author: Date:

1997 SUPRA (RM502U)

Door Lock Motor Circuit

CIRCUIT DESCRIPTIONThis door lock motor locks and unlocks the door according to signals from the ECU.

WIRING DIAGRAM

DI4XF-01

N08716


879Author: Date:

1997 SUPRA (RM502U)


1 Check operating sound of door lock motor.

CHECK:Check operating sound of door lock motor, when door lock con-trol switch is pushed to the lock side and unlock side.OK:

Can hear operating sound of door lock motor.HINT:Inspect the door which is malfunctioning.

OK Repair or replace door lock control link.

NG

N16142

N16142

N16142

N16142

I04613

Driver’s Side Passenger’s Side

2 (+) 2 (-)

2 (-) 2 (+)

Lock

Unlock

Passenger’s SideDriver’s Side

4 (-) 4 (+)

4 (+) 4 (-)


880Author: Date:

1997 SUPRA (RM502U)

2 Check door lock motor.

PREPARATION:(a) Remove the door trim and service hole cover.(b) Disconnect the door lock motor connector.CHECK:(a) Connect positive lead to terminal 2 (4) and negative

lead to terminal 4 (2) of door lock motor connector.(b) Connect positive lead to terminal 4 (2) and negative

lead to terminal 2 (4) of door lock motor connector.( ): Passenger’s Side.

OK:(1) Door lock motor locks door.(2) Door lock motor unlocks door.

HINT:This inspection must be carried out within 2 seconds.

OK Replace door lock motor.

NG

3 Check harness and connectors between ECU and door lock motor(See page IN-28 ).


OK

Proceed to next circuit inspection shown onmatrix chart (See page DI-615 ).

I02563

Door Lock Control Switch LH(Power Window Master Switch)


Door Lock Control Switch RH

T13

12V

R-W

G-R

L15

UL1

8

J/B No.1

W-B

W-B

W-BR-W

G-R

R-W

G-R G-R

R-W

W-BIL1

IL1

IL1

ID1

ID17

1

2

1

101

164

2

310

9

IJ ID8

IH

IE


881Author: Date:

1997 SUPRA (RM502U)

Door Lock Control Switch Circuit

CIRCUIT DESCRIPTIONWhen the door lock control switch is pushed to the lock side, Lock terminal of the switch is grounded, andwhen the switch is pushed to the unlock side, unlock terminal is grounded (See wiring diagram below).

WIRING DIAGRAM

DI4XG-01

I02564

ON2 (+) 1 (+)

3 (+) 1 (+)

LH

RH

(+)(-)


882Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminals 2(3), 1(1) of door lock control switch connectorand body ground.

PREPARATION:Remove the door trim.CHECK:(a) Turn the ignition switch ON.(b) Measure voltage between terminals 2(3), 1(1) of door lock

control switch connector and body ground, when doorlock control switch is pressed to the lock side, unlock sideand OFF position.

OK:

Switch position Terminal 2(3) Terminal 1(1)

Lock side Below 1 V 8 - 10 V

Unlock side 8 - 10 V Below 1 V

OFF 8 - 10 V 8 - 10 V

HINT:The terminal number without brackets is for the LH, the numberwith brackets is for the RH.


NG

I02565

2

1

8

2

LH

RH 3

4


883Author: Date:

1997 SUPRA (RM502U)

2 Check door lock control switch.

PREPARATION:Disconnect the door lock control switch connector.CHECK:Check continuity between terminals 2(3), 1(2), 8(4) of door lockcontrol switch connector, when door lock control switch ispressed to the lock side, and unlock side and OFF position.OK:

Switch position Terminal No. to continuity

Lock side 2(3) - 8(4)

Unlock side 1(2) - 8(4)

OFF

HINT:The terminal number without brackets is for the LH, the numberwith brackets is for the RH.

NG Replace door lock control switch.

OK

3 Check harness and connectors between ECU and door lock control switch,switch and body ground (See page IN-28 ).


OK

Check and replace ECU. *1

*1: Malfunction of the ECU can be considered possible only when the problem symptom as follows: Lock and/or unlock using the Door Lock Control Switch cannot be done, neither on the driver’s side noron the passenger’s side.

I02566

Door Key Lock andUnlock Switch LH


Door Key Lock andUnlock Switch RH

J/B No.1

W-B W-B

T13

W-B

W-BG-Y

W

W

G-Y

G-Y

G-Y

G UL3

L2

UL2W

12V

12V

1J1

1D10

IL116

1

2

2

1

3

3ID1

ID1

IL1

IL12

7

3

13

6

22

16

IE

IH


884Author: Date:

1997 SUPRA (RM502U)

Door Key Lock and Unlock Switch Circuit

CIRCUIT DESCRIPTIONThe door key lock and unlock switch is built in the door key cylinder.When the key is turned to the lock side, terminal 3 of the switch is grounded and when the key is turned tothe unlock side, terminal 1 of the switch is grounded.

WIRING DIAGRAM

DI4XH-01

N16147

2

3

1


885Author: Date:

1997 SUPRA (RM502U)


1 Check door key lock and unlock switch.

PREPARATION:(a) Remove the door trim and service hole cover.(b) Disconnect the door key lock and unlock switch connec-

tor.CHECK:Check continuity between terminals 1, 2 and 3 of door key lockand unlock switch connector, when door key lock and unlockswitch is turned to the lock side, unlock side and when it is notturned.OK:


Lock side 2 - 3

Unlock side 1 - 3

OFF -

NG Replace door key lock and unlock switch.

OK

2 Check harness and connectors between ECU and switch, switch and bodyground (See page IN-28 ).


OK


I02567I02567


Key Unlock WarningSwitch

T13

12V

Y

20

KSWIF1

Y11

21W-B

J/B No.1

W-B

1K1J121

IE


886Author: Date:

1997 SUPRA (RM502U)

Key Unlock Warning Switch Circuit

CIRCUIT DESCRIPTIONThe key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off whenthe ignition key is removed.The ECU operates the key confinement prevention function while the key unlock warning switch is on.

WIRING DIAGRAM

DI4XI-01

I02712

Disconnect

12


887Author: Date:

1997 SUPRA (RM502U)


1 Check key unlock warning switch.

PREPARATION:Disconnect key unlock warning switch connector.CHECK:Check continuity between terminal 1 and 2 of key unlock warn-ing switch connector, when the key is inserted to the key cylin-der or removed.OK:


ON (Key inserted) 1 - 2

OFF (Key removed) -

NG Replace key unlock warning switch.

OK

2 Check harness and connectors between ECU and key unlock warning switch,key unlock warning switch and body ground (See page IN-28 ).


OK


DI4XJ-01

Customer Problem Analysis Check

Check and Clear DTC (Precheck)


Problem Symptom ConfirmationSymptom SimulationSymptom does not occur

DTC Check Normal code

DTC Chart Problem Symptoms Table

Circuit Inspection Input Signal CheckParts Inspection


Repair

Confirmation Test or Road Test *

End

Items inside are titles of pages in thismanual with the page number indicated in thebottom portion. See the indicated pagesfor detailed explanations.

1

2

34

5

6 7

89

10Step 2, 5, 8, 10: Diagnostic steps permitting the use

of the TOYOTA hand-held tester orTOYOTA break-out-box.

P. DI-661

P. DI-662

P. DI-662

P. DI-667

P. IN-18

P. DI-671 - DI-671

P. DI-673 - DI-710

OK

NG

Malfunction code

Clear DTC

P. DI-662*: See next page

DI-660-DIAGNOSTICS CRUISE CONTROL SYSTEM

888Author: Date:

1997 SUPRA (RM502U)

CRUISE CONTROL SYSTEMHOW TO PROCEED WITH TROUBLESHOOTINGTroubleshoot in accordance with the procedure on the following page.

DI4XK-01

CRUISE CONTROL SYSTEM Check Sheet Inspector’s name:

Customer’s Name

Date of Vehicle

Registration No.

Registration Year

Frame No.

Odometer Reading / / kmMile

Condition ofProblem Occurrence

Date of Problem

How Often does

Occurrence

Problem Occur?

Vehicle Speed whenProblem Occurred

/ /

Continuous Intermittent ( Times a day)

kmMile

Brought in

Auto cancel occurs

Driving condition City driving Freeway Up hill Down hill

After cancel occurred, did the driver activate cruise control again? Yes No

Cancel does not occur

With brake ON Except D position shift When control SW turns to CANCEL position

Cruise control malfunction

Slip to acceleration side Slip to deceleration side Hunting occurs O/D cut off does not occur O/D does not return

Switch malfunction SET ACCEL COAST RESUME CANCEL

Remains ON Does not light up Blinking

Symptoms

DTC Check1st Time

2nd Time



-DIAGNOSTICS CRUISE CONTROL SYSTEMDI-661

889Author: Date:

1997 SUPRA (RM502U)


N08654

DI4XL-01

BE4034

Indicator Light

1.5 sec. 0.5 sec.

ON

OFF

N19819

DLC1 E1 Tc


890Author: Date:

1997 SUPRA (RM502U)

PRE-CHECK1. DIAGNOSIS SYSTEM(a) Check the indicator.

(1) Turn the ignition switch to ON.(2) Check that the CRUISE MAIN indicator light comes

on when the cruise control main switch is turned on,and that the indicator light goes off when the mainswitch is turned OFF.

HINT:If the indicator check result is not normal, proceed to trouble-shooting (See page BE-2 ) for the combination meter section.

(b) Clear the DTC.HINT:If a malfunction occurs in the No.1 vehicle speed sensors or ac-tuator, etc. during cruise control driving, the ECU actuatesAUTO CANCEL of the cruise control and turns on and off theCRUISE MAIN indicator light to inform the driver of a malfunc-tion. At the same time, the malfunction is stopped in memory asa DTC.

(c) Output of DTC using diagnosis check wire.(1) Turn the ignition switch ON.(2) Using SST, connect terminals Tc and E1 of DLC1.SST 09843-18020(3) Read the DTC on the CRUISE MAIN indicator light.

BE4032

BE4033 I00021

0.25 sec.0.25 sec.

Normal Code

Malfunction codes 11 and 21

4 sec.

0.5 sec.1.5 sec. 1.5 sec.

0.5 sec.

2.5 sec.

ON

OFFCode 11 Code 21

ON

OFF

N09348

TOYOTA Hand-Held Tester

TOYOTA Break-out-box

N09001

DOME Fuse

R/B No.2

I02735


891Author: Date:

1997 SUPRA (RM502U)

HINT: If the DTC is not output, inspect the diagnosis circuit (See

page DI-708 ). As an example, the blinking patterns for codes; normal,

11 and 21 are shown in the illustration.

2. ECU TERMINAL VALUES MEASUREMENT BY USINGTOYOTA BRAKE-OUT-BOX AND TOYOTA HAND-HELD TESTER

(a) Hook up the TOYOTA break- out- box and TOYOTAhand-held tester to the vehicle.

(b) Read the ECU input/output values by following theprompts on the tester screen.

(c) Please refer to the TOYOTA hand-held tester has a”Snapshot” function. This records the measured data andis effective in the diagnosis of intermittent problems.

3. DTC CLEARANCE(a) After completing repairs, the DTC retained in memory can

be cleared by removing the DOME fuse for 10 seconds ormore, with the ignition switch off.

(b) Check that the normal code is displayed after connectingthe fuse.

4. PROBLEM SYMPTOM CONFIRMATION (Road Test)(a) Inspection the SET switch.

(1) Push the main switch ON.(2) Drive at a desired speed (40 km/h (25 mph) or high-

er).(3) Press the control switch to the SET/COAST.(4) After releasing the switch, check that the vehicle

cruises at the desired speed.

I02735

I02735


892Author: Date:

1997 SUPRA (RM502U)

(b) Inspect the ACCEL switch.(1) Push the main switch ON.(2) Drive at a desired speed (40 km/h (25 mph) or high-

er).(3) Check that the vehicle speed is increased while the

control switch turned to RES/ACC, and that the ve-hicle cruise at the set speed when the switch is re-leased.

(4) Momentarily press the control switch upward in theRES/ACC and then immediately release it. Checkthat the vehicle speed increases by about 1.5 km/h(Tap-up function).

(c) Inspect the COAST switch.(1) Push the main switch ON.(2) Drive at a desired speed (40 km/h (25 mph) or high-

er).(3) Check that the vehicle speed is decreased while the

control switch is turned to SET/COAST, and the ve-hicle cruise at the set speed when the switch is re-leased.

(4) Momentarily press the control switch is turned toSET/COAST, and then immediately release it.Check that the vehicle speed decreases by about1.5 km/h (Tap-down function).

I02735

I02735


893Author: Date:

1997 SUPRA (RM502U)

(d) Inspect the CANCEL switch.(1) Push the main switch ON.(2) Drive at a desired speed (40 km/h (25 mph) or high-

er).(3) When operating one of the followings, check that

the cruise control system is cancelled and that thenormal driving mode is reset.

Depress the brake pedal Depress the clutch pedal (M/T) Shift to except D position (A/T) Turn the main switch OFF Pull the cruise control switch to CANCEL

(e) Inspect the RESUME switch.(1) Push the main switch ON.(2) Drive at a desired speed (40 km/h (25 mph) or high-

er).(3) When operating one of the followings, check that

the cruise control system is cancelled and that thenormal driving mode is reset. Depress the brake pedal Depress the clutch pedal (M/T) Shift to except D position (A/T) Turn the main switch OFF Pull the cruise control switch to CANCEL

(4) After the control switch is turned to RES/ACC at thedriving speed of more than 40 km/h (25 mph), checkthat the vehicle restores the speed prior to the can-cellation.

BE6443

(1)

(2)

(1)

No. Operation Method CRUISE MAIN Indicator LightBlinking Pattern

Diagnosis

1

3

4

2

Turn SET/COAST switch ON

Turn RES/ACC switch ON

Drive at about 40 km/h(25 mph) or below

Turn CANCEL switch ON

Turn stop light switch ONDepress brake pedal

Turn PNP switch OFF(Shift to except D position)

Turn clutch switch OFF(Depress clutch pedal)

Drive at about 40 km/h(25 mph) or higher

SET / COAST switchcircuit is normal

RES / ACC switch circuitis normal

PNP switch circuit is normal

CANCEL switch circuitis normal

Clutch switch circuit is normal

Vehicle Speed Sensor isnormal

Stop light switch circuitis normal

ON

OFF

0.25 sec. 0.25 sec.

1 sec.Light

ON

OFF

Light

ON

OFF

Light

ON

OFF

Light

ON

OFF

Light

ON

OFF

Light

Switch OFF

Switch ON

Switch ON

Switch OFF


894Author: Date:

1997 SUPRA (RM502U)

5. Using TOYOTA hand-held tester:INPUT SIGNAL CHECK

HINT:(1) For check No.1 − No.2 Turn the ignition switch ON.

(2) For check No.3 Turn ignition switch ON. Shift to D position.

(3) For check No.4 Jack up the vehicle. Start the engine. Shift to D position.

(a) Press the control switch to SET/COAST or RES/ACCposition and hold it down or hold it up ”1”.

(b) Push the main switch ON ”2”.(c) Check that the CRUISE MAIN indicator light blinks twice

or 3 times repeatedly after 3 seconds.(d) Turn the SET/COAST or RES/ACC switch OFF.(e) Operate each switch as listed in the table below.(f) Read the blinking pattern of the CRUISE MAIN indicator

light.(g) After performing the check, turn the main switch OFF.HINT:When 2 or more signals are input to the ECU, the lowest num-bered code will be displayed first.

DI4XM-01


895Author: Date:

1997 SUPRA (RM502U)

DIAGNOSTIC TROUBLE CODE CHARTIf a malfunction code is displayed during the DTC check, check the circuit listed for that code in the tablebelow and proceed to the appropriate page.

DTC No.


11, 15

(DI-673 )Actuator Motor Circuit

Cruise control actuator motor

Harness or connector between actuator motor and ECU

ECU

12

(DI-675 )Actuator Magnetic Clutch Circuit

Cruise control magnetic clutch

Harness or connector between ECU and magnetic clutch,

magnetic clutch and body ground

ECU

14

(DI-677 )Actuator Motor Circuit

Cruise control actuator motor

Harness or connector between actuator motor and ECU

ECU

21

(DI-679 )Vehicle Speed Sensor Circuit

Vehicle speed sensor

ECU

Combination meter

Harness or connector between vehicle speed sensor and

ECM, ECM and combination meter, combination meter and

ECU

ECU

23

(DI-681 )Vehicle Speed Sensor Circuit


Harness or connector (SPD)

ECU

32

(DI-682 )Control Switch Circuit (Cruise Control Switch)

Cruise control switch

Harness or connector between control switch and ECU

ECU

41 Cruise Control ECU ECU

42 Source voltage drop Power source

51

(DI-685 ) Idle switch circuit


Harness or connector between cruise control ECU and

throttle position sensor

ECU

HINT: 1. When 2 or more codes are indicated, the lowest numbered code will be displayed first. 2. If the inspection ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart

for each circuit, proceed to the circuit with the next highest number in the table to continue check. 3. If the trouble still reappears even though there are no abnormalities in any of the other circuit, then

check or replace the cruise control ECU as the last step. (*) When the vehicle speed decrease on uphill roads, the speed can be set again and driving contin-

ued. (This is not a malfunction.)

DI4XN-01

I02713I02713

DLC1

Cruise ControlActuator

R/B No.2 DOME Fuse

Cruise Control ECU

Cruise Control Switch

Clutch Switch

Vehicle Speed Sensor

Park/Neutral Position SwitchStop Light Switch

J/B No.1 ECU-B Fuse ECU-IG Fuse


896Author: Date:

1997 SUPRA (RM502U)

PARTS LOCATION

DI4XO-01

I04621

C16


897Author: Date:

1997 SUPRA (RM502U)

TERMINALS OF ECM

Symbols (Terminals No.) Wiring Color Condition STD Voltage (V)

D ↔ GNDG R W B

M/T: Depress clutch pedal

A/T: Shift to except D positionBelow 1 V

D ↔ GND

(C16-2 ↔ C16-13)G-R ↔ W-B

M/T: Release clutch pedal

A/T: Shift to D position10 - 16 V

PI ↔ GNDO W B

Ignition switch ON

Cruise control main switch ONBelow 1.2 V

PI ↔ GND

(C16-7 ↔ C16-13)O ↔ W-B

Ignition switch ON

Cruise control main switch OFF10 - 16 V

TC GNDIgnition switch ON 10 - 16 V

TC ↔ GND

(C16-8 ↔ C16-13)R ↔ W-B Ignition switch ON

Connect terminals TC and E1 of DLC1Below 1 V

OD ↔ GNDLG B W B

During cruise control driving

OD switch ON10 - 16 V

OD ↔ GND

(C16-9 ↔ C16-13)LG-B ↔ W-B


OD switch OFF (3rd driving)Below 1 V

L ↔ GNDB W W B

During cruise control driving 9 - 15 VL ↔ GND

(C16-10 ↔ C16-13)B-W ↔ W-B

Except during cruise control driving Below 1 V

MC ↔ GNDG R W B


COAST switch hold ON9 - 15 V

MC ↔ GND

(C16-11 ↔ C16-13)G-R ↔ W-B


ACC switch hold ONBelow 1 V

MO ↔ GNDLG W B


ACC switch hold ON9 - 15 V

MO ↔ GND

(C16-12 ↔ C16-13)LG ↔ W-B


COAST switch hold ONBelow 1 V

GND ↔ Body Ground

(C16-13 ↔ Body Ground)

W-B ↔ Body

GroundConstant Below 1 V

B ↔ GND

(C16-14 ↔ C16-13)B-R ↔ W-B Ignition switch ON 10 - 16 V

BATT ↔ GND

(C16-15 ↔ C16-13)W-R ↔ W-B Constant 10 - 16 V

STP ↔ GND G-W ↔ W-B Depress brake pedal 10 - 16 VSTP ↔ GND

(C16-16 ↔ C16-13) G-W ↔ W-B Release brake pedal Below 1 V


898Author: Date:

1997 SUPRA (RM502U)

Ignition switch ON 10 - 16 V

CCS GND

Ignition switch ON

CANCEL switch hold ON4.2 - 8.7 V

CCS ↔ GND

(C16-18 ↔ C16-13)L ↔ W-B Ignition switch ON

SET/COAST switch hold ON2.5 - 6.2 V

Ignition switch ON

RES/ACC switch hold ON0.8 - 3.6 V

CMS ↔ GNDR Y W B

Ignition switch ON

Main switch ONBelow 1 V

CMS ↔ GND

(C16-19 ↔ C16-13)R-Y ↔ W-B

Ignition switch ON

Main switch OFF10 - 16 V

Ignition switch ON 10 - 16 V

SPD ↔ GND

(C16-20 ↔ C16-13)P ↔ W-B

During driving

Repeatedly change

from below 1 V to

10 - 16 V

IDL ↔ GNDR B W B

Ignition switch ON

Throttle valve fully closedBelow 1 V

IDL ↔ GND

(C16-21 ↔ C16-13)R-B ↔ W-B

Ignition switch ON

Throttle valve fully opened10 - 16 V

ECT ↔ GNDR L W B

During driving

Gear position O/DBelow 1 V

ECT ↔ GND

(C16-22 ↔ C16-13)R-L ↔ W-B

During driving

Gear position 3rd10 - 16 V

DI4XP-01


899Author: Date:

1997 SUPRA (RM502U)

PROBLEM SYMPTOMS TABLESymptom Suspect Area See page

Cruise control system does not set.

Cruise control system does not operate.

Input signal check No.4: OK


2. Wire Harness

3. Main Switch Circuit

4. Control Switch Circuit

5. Stop Light Switch Circuit

6. PNP Switch or Clutch Switch Circuit

7. Actuator Control Cable

8. Actuator Motor Circuit

9. Cruise Control ECU

Input signal check No.4: NG

1. Vehicle Speed Sensor Circuit


DI-699

DI-704

DI-682

DI-687

DI-694 ,

DI-697

DI-710

DI-673

IN-28

DI-679

IIN-28

Indicator light does not light up.

1. Wire Harness

2. CRUISE MAIN Indicator Light Circuit


DI-706

IIN-28

Vehicle speed drop when the cruise control switch turned to SET.



3. Idle Signal Circuit



DI-710

DI-699

DI-685

DI-673

IN-28

Set speed deviates on high or low side.









DI-679

DI-710

DI-699

DI-673

IN-28

IN-28

Vehicle speed fluctuates when cruise control switch turn to SET.



3. Idle Signal Circuit

4. ECT Communication Circuit



DI-679

DI-710

DI-685

DI-690

DI-673

IN-28

Acceleration response is sluggish when cruise control switch turn

to ”ACCEL” or ”RESUME”.









DI-673

DI-679

DI-710

IN-28

DI-682

IN-28

Set speed does not cancel when brake pedal depressed.




1. Stop Light Switch Circuit


IN-28

DI-687

IIN-28

Cruise control does not cancel when transmission is shifted to

except D position. (A/T)




1. PNP Switch Circuit


IIN-28

DI-694

IN-28


900Author: Date:

1997 SUPRA (RM502U)

Cruise control does not cancel when clutch pedal depressed.




1. Clutch Switch Circuit


IN-28

DI-697

IN-28

Cruise control does not cancel when cruise control switch turned

to CANCEL.






IN-28

DI-682

IN-28

Vehicle speed does not decrease when cruise control switch

turned to COAST.









DI-673

DI-710

DI-679

IIN-28

DI-682

IN-28

Vehicle speed does not accelerate when cruise control switch

turned to ACCEL.









DI-673

DI-710

DI-679

IIN-28

DI-682

IN-28

Vehicle speed does not return to memorized speed when cruise

control switch turned to RESUME.









DI-673

DI-710

DI-679

IN-28

DI-682

IN-28

Speed can be set below about 40 km/h (25 mph).






IN-28

DI-679

IN-28

Cruise control does not cancel when speed is less than 40 km/h

(25 mph).







DI-673

IIN-28

DI-679

IIN-28

DI4XQ-01

Duty Ratio =A + B

A x 100 (%) ON

OFF

A

B1 cycle

I02714

Cruise Control Actuator Cruise Control ECU

MC

2C4

1

G-R

C4LG

9IB6

15IB6

G-R

LG

11C16

C1612

MC

MOMO


901Author: Date:

1997 SUPRA (RM502U)

CIRCUIT INSPECTION

DTC 11, 15 Actuator Motor Circuit

CIRCUIT DESCRIPTIONThe actuator motor is operated by signals from the ECU. Acceleration and deceleration signals are trans-mitted by changes in the Duty Ratio (See note below).Duty RatioThe duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuityin one cycle, and B is the period of non-continuity, then.

DTC No. Detection Item Trouble Area

11 Short in actuator motor circuit

Cruise control actuator

Harness or connector between actuator and cruise control

ECU

Cruise control ECU

15 Open in actuator motor circuit Cruise control actuator

WIRING DIAGRAM

N19821

1

2


902Author: Date:

1997 SUPRA (RM502U)


1 Check resistance between terminals MO and MC of cruise control actuator.

PREPARATION:(a) Ignition switch ON.(b) Disconnect actuator connector.CHECK:Measure resistance between terminals 1 and 2.HINT:If control plate position is fully opened or fully closed, resistancecan not measure.OK:

Resistance: more than 4.2 Ω

NG Replace cruise control actuator.

OK

2 Check wire harness and connector between terminals MO of cruise control ECUand MO of cruise control actuator (See page IN-28 ).


OK

Replace cruise control ECU(See page IN-28 ).

I02715

Cruise Control Actuator

Magnetic Clutch

GND4C4

C4

3L

BR-Y

R-L

17IB6

8IB6

W-B

R-L

BatterySTOP

101I

J/B No.1

W

Cruise Control ECU

13

4 3

2 1

S11

S11

S11

S11

Stop Light Switch

B-W

G-W G-W

C16

C16

C16

10

16

To Light Failure Sensor

GND

L

STP-


903Author: Date:

1997 SUPRA (RM502U)

DTC 12 Magnetic Clutch Circuit

CIRCUIT DESCRIPTIONThis circuit turns on the magnetic clutch inside the actuator during cruise control operation according to thesignal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-tion, the rotor shaft between the motor and control plate is released.When the brake pedal is depressed, the stoplight switch turns on, supplying electrical power to the stoplight.Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (6 mph) above the set speed,then cruise control at the set speed is resumed.


12Short in magnetic clutch circuit

Open (0.8 sec.) in magnetic clutch circuit

Cruise contorl actuator magnetic clutch

Harness or connector between ECU and magnetic clutch,

magnetic clutch and body ground

Cruise control ECU

WIRING DIAGRAM

DI4XR-01

N08843

J/B No.1 STOP Fuse


904Author: Date:

1997 SUPRA (RM502U)


1 Check STOP fuse.

PREPARATION:Remove STOP fuse from J/B No.1.CHECK:Check fuse continuity.OK:

There is continuity.

NG Replace STOP fuse.

OK

2 Check harness and connector between actuator and cruise control actuator (Seepage IN-28 ).


OK

Check and replace cruise control ECU (Seepage IN-28 ).

N19825

4

3


905Author: Date:

1997 SUPRA (RM502U)

DTC 14 Actuator Mechanical Malfunction

CIRCUIT DESCRIPTIONSee page DI-673 .



1 Check actuator arm locking operation.

PREPARATION:(a) Ignition switch OFF.(b) Disconnect actuator connector.CHECK:(a) Connect the positive lead from the battery to the termi-

nal 3 of actuator and the negative lead to terminal 4.NOTICE:Do not connect the high tension cables to the wrong bat-tery terminal. You will damage the cruise control actuator.(b) Move the control plate by hand.OK:

Control plate does not move.

NG Replace cruise control actuator.

OK

DI4XS-01

I02716

Full Open Side

Control Plate

4

1

3 2

(+)

(-)

I02717

Full Close Side

Control Plate

41

3 2

(+)

(-)


906Author: Date:

1997 SUPRA (RM502U)

2 Check actuator operation.

PREPARATION:Disconnect the actuator connector.CHECK:Connect the positive lead from the battery to terminals 3 and1 of actuator, connect the negative lead to terminals 4 and2 of actuator.OK:

Control arm moves to full open side

CHECK:Connect the positive lead from the battery to the terminals4 and 2 of actuator, connect the negative lead to terminals3 and 1 of actuator.OK:

Control arm moves to full close side

NG Replace actuator.

OK

3 Check harness and connector between actuator and cruise control ECU(See page IN-28 ).


OK

Check and replace cruise control ECU(See page IN-28 ).

I00292


ECU Combination Meter Cruise Control ECU

4 pulse/

1 rotation

of rotor shaft

4 pulse/

1 rotation

of rotor shaft

I02718

Speedometer(Combination Meter)

L-R2II1 V10

3

No.1 Vehicle Speed Sensor(Combination Meter)

T65

Telltale Light RH

ODO and TRIPMeter Circuit

6T6

P 5IF2

P 20C16

Cruise Control ECU

SPD

W

W

W

W


907Author: Date:

1997 SUPRA (RM502U)

DTC 21 Open in Vehicle Speed Sensor Circuit

CIRCUIT DESCRIPTIONThe vehicle speed sensor circuit is sent to cruise control ECU as vehicle speed signal. For each rotation ofthe shaft, the vehicle speed sensor sends a signal through the combination meter to the cruise control ECU(See the following). The ECU calculates the vehicle speed from this pulse frequency.


21Speed signal is not input to the cruise control ECU while cruise

control is set.


Combination meter

Cruise control ECU

WIRING DIAGRAM

DI4XT-01

Input Signal Indicator LightBlinking Pattern

Drive at about 40 km/h (25 mph)or below

Drive at about 40 km/h (25 mph)or higher

Light ON

OFF

LightON

OFF


908Author: Date:

1997 SUPRA (RM502U)


1 Input signal check.

CHECK:(a) See input signal check on page(b) Check indicator light operation when driving with vehicle

speed above 40 km/h (25 mph), and with vehicle speedbelow 40 km/h (25 mph).

OK:Vehicle speed above 40 km/h (25 mph):Indicator light blinksVehicle speed below 40 km/h (25 mph):Indicator light stays on

OK Check and replace cruise control ECU(See page IN-28 ).

NG

2 Check harness and connector between speed meter and cruise control ECU(See page IN-28 ).


OK

3 Check vehicle speed sensor (See page BE-43 ).

NG Replace vehicle speed sensor.

OK



909Author: Date:

1997 SUPRA (RM502U)

DTC 23 Vehicle Speed Signal Abnormal

CIRCUIT DESCRIPTIONSee page DI-679 .


23

Vehicle speed sensor pulse is abnormal. (When sped signal

is not input to the ECU below 0.2 sec., code will be dis-

played.)


Cruise control ECU



1 Check vehicle speed sensor (See page BE-43 ).

NG Replace vehicle speed sensor.

OK


DI4XU-01

I02719

W-B

IE

W-B

J/B No.1

11J

131H

Cruise Control ECU

W-B W-B13C16

C1417


CANCEL SET/COAST

RESUME/ACCEL

E MAIN

CMS

15C14

5C14

R-Y

L

19C16

18C16

GND

W-B

CMS

CCS


910Author: Date:

1997 SUPRA (RM502U)

DTC 32 Control Switch Circuit(Cruise Control Switch)

CIRCUIT DESCRIPTIONThis circuit carries the SET/COAST, RESUME/ACCEL and CANCEl signals (each voltage) to the ECU.


32 Short in control switch circuit

Cruise control switch

Harness or connector between control switch and cruise

control ECU.

Cruise control ECU

WIRING DIAGRAM

DI4XV-01

Input SignalIndicator Light Blinking Pattern

SET/COASTswitch

RESUME/ACCELswitch

CANCEL switch

2 PulsesON

OFF

ON

OFF

3 Pulses

ON

OFF

SW OFF

SW ON

N16045

34


911Author: Date:

1997 SUPRA (RM502U)



PREPARATION:See input signal check on page DI-662 .CHECK:Check the indicator light operation when each of the SET/COAST, RESUME/ACCEL and CANCEL is turned on.OK:

SET/COAST, RESUME/ACCEL switchThe signals shown in the table on the left should beoutput when each switch is ON. The signal shoulddisappear when the switch is turned OFF.CANCEL switchThe indicator light goes off when the cancel switch isturned on.

OK Wait and see.

NG

2 Check control switch.

PREPARATION:(a) Remove steering wheel center pad (See page SR-1 1).(b) Disconnect control switch connector.CHECK:Measure resistance between terminals 3 and 4 of control switchconnector when control switch is operated.

Switch position Resistance (Ω)

Neutral ∞ (No continuity)

RES/ACC 50 - 80

SET/COAST 180 - 220

CANCEL 400 - 440

OK Repair control switch.

NG


912Author: Date:

1997 SUPRA (RM502U)

3 Check harness and connector between cruise control switch and cruise controlECU (See page IN-28 ).


OK

4 Input signal check (See step 1).

OK Wait and see.

NG


I02720

IDL1

64E9 R-B* 1

R*2

R-B* 1

2*2 T2

IDL

Throttle Position Sensor

3IJ1 R-B

21C16

IDL

Cruise Control ECU

3*1

R-B* 1

R*2R*2

*1: 2JZ-GE Engine*2: 2JZ-GTE Engine

ECM


913Author: Date:

1997 SUPRA (RM502U)

DTC 51 Idle Signal Circuit

CIRCUIT DESCRIPTIONWhen the idle switch in turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the dis-crepancy between the throttle valve position and the actuator position sensor value to enable accuratecruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the en-gine, so also inspect the engine.


51 Short in idle signal circuit

Harness or connector between cruise control ECU and

throttle position sensor


Cruise control ECU

WIRING DIAGRAM

DI4XW-01


914Author: Date:

1997 SUPRA (RM502U)


1 Check throttle position sensor circuit(2JZ-GE: See page SF-42 , 2JZ-GTE: See page SF-44 ).

NG Replace throttle position sensor.

OK

2 Check harness and connector between ECM and throttle position sensor(See page IN-28 ).


OK

3 Check harness and connector between cruise control ECU and throttle positionsensor (See page IN-28 ).


OK


N19613

2

2 12

4 3 10

16

Cruise Control ECU

1B I1 S11 S11 G-W

B-W

Cruise Control Actuator

R/B No.2

BatteryB

2A

2

ALT

W-L

J/B No.1

STOP 10

C16

L

STP-

2

W-L

S11 S11 C16

PO

WE

R

R-L

R-L

W

Stop Light Switch


915Author: Date:

1997 SUPRA (RM502U)

Stop Light Switch Circuit

CIRCUIT DESCRIPTIONWhen the brake is on, battery positive voltage normally applies through the STOP fuse and stop light switchto terminal STP- of the ECU, and the ECU turns the cruise control off.A fail-safe function is provided so that cancel functions normally, even if there is a malfunction in the stoplight signal circuit.If the harness connected to terminal STP- has an open circuit, terminal STP- will have battery positive volt-age and the cruise control will be turned off.Also, when the brake is on, the magnetic clutch is cut mechanically by the stop light switch, turning the cruisecontrol off. (See page DI-675 for operation of the magnetic clutch)

WIRING DIAGRAM

DI4XX-01


Stop Light switch ON

LightOFF

ON

SW OFF

SW ON


916Author: Date:

1997 SUPRA (RM502U)


1 Check operation of stop light.

CHECK:Check that stop light comes on when brake pedal is depressed, and turns off when brake pedal is released.

NG Check stop light system.

OK


CHECK:(a) See input signal check on DI-662 .(b) Check the indicator light when the brake pedal is de-

pressed.OK:

The indicator light goes off when the brake pedal isdepressed.

OK Proceed to next circuit inspection shown onproblem symptoms table (See page DI-671 ).

NG

I02722

ON

(-) STP-(+)


917Author: Date:

1997 SUPRA (RM502U)

3 Check voltage between terminal STP- of cruise control ECU connector and bodyground.

PREPARATION:Remove cruise control ECU with connectors still connected.CHECK:(a) Turn ignition switch ON.(b) Measure voltage between terminal STP-of cruise control

ECU connector and body ground, when the brake pedalis depressed and released.

OK:

Depressed 10 - 14 V

Released Below 1 V


NG

4 Check for open in harness and connectors between terminal STP- of cruise con-trol ECU and stop light switch (See page IN-28 ).


OK


N19614

ECM

E10

E9

IJ2

IJ2

C16

C16

E2

E2

12

9

8

2

22

911

10

Cruise Control ECU

OD

ECT

BR-B*1 LG-BLG-B*1 (A/T)

R-L(A/T)

OD1

S2

*1: 2JZ-GTE Engine*2: 2JZ-GE Engine

R-L(A/T)

R-L(A/T)

Electronically Controlled Transmission Solenoid

*1

*2

S2


918Author: Date:

1997 SUPRA (RM502U)

Electronically Controlled Transmission Communication Circuit

CIRCUIT DESCRIPTIONWhen driving uphill under cruise control, in order to reduce shifting due to ON-OFF overdrive operation andto provide smooth driving, when down shifting in the electronically controlled transmission occurs, a signalto prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronicallycontrolled transmission.Terminal ECM of the cruise control ECU detects the shift change signal (output to electronically controlledtransmission No.2 solenoid) from the electronically controlled transmission.If vehicle speed down, also when terminal electronically controlled transmission of the cruise control ECUreceive down shifting signal, it sends a signal from terminal OD to ECM to cut overdrive until the end of theuphill slope, and the gear shifts are reduced and gear shift points in the electronically controlled transmissionare changed.

WIRING DIAGRAM

DI4XY-01

I02724

ON

(-)

OD (+)


919Author: Date:

1997 SUPRA (RM502U)


1 Check operation of overdrive.

PREPARATION:Test drive after engine warms up.CHECK:Check that overdrive ON ↔ OFF occurs with operation of OD switch ON ↔ OFF.

NG Check and repair electronically controlledtransmission (See page DI-371 ).

OK

2 Check voltage between terminal OD of harness side connector of cruise controlECU and body ground.

PREPARATION:Remove cruise control ECU with connector still connected.CHECK:(a) Disconnect cruise control ECU connector.(b) Turn ignition switch ON.(c) Measure voltage between terminal OD of harness side

connector of cruise control ECU and body ground.OK:

Voltage: 10 - 14 V

NG Go to step 5.

OK

N19837

(-) ECT (+)


920Author: Date:

1997 SUPRA (RM502U)

3 Check voltage between terminal ECT of cruise control ECU connector and bodyground (On test drive).

PREPARATION:(a) Connect cruise control ECU connector.(b) Test drive after engine warms up.CHECK:Check voltage between terminal ECT of cruise control ECUconnector and body ground when OD switch is ON and OFF.OK:

OD switch position Voltage

ON 8 - 14 V

OFF Below 0.5 V


NG

4 Check harness and connector between terminal ECT of cruise control ECU andelectronically controlled transmission solenoid (See page IN-28 ).


OK

Check and replace cruise control ECU.


921Author: Date:

1997 SUPRA (RM502U)

5 Check harness and connector between terminal OD of cruise control ECU andterminal OD1 of ECM (See page IN-28 ).


OK


I02725

Ignition Switch

51J

GAUGE

12 1E

121H

J/B No.1

Y(M/T)

1C15 C15

2Cruise Control Clutch Start Switch (M/T)

(M/T)G-R

G-R (A/T)

7 IJ2

Y

23 II1

Y(A/T)

4P2 P2

9Park/Neutral Position Switch (A/T)

G-R

2C16

D

Cruise Control ECU

Y

*1: 2JZ-GTE Engine*2: 2JZ-GE Engine


922Author: Date:

1997 SUPRA (RM502U)

Park/Neutral Position Switch Circuit

CIRCUIT DESCRIPTIONWhen the shift position is put in except D position, a signal is sent from the park/neutral position switch tothe ECU. When this signal is input during cruise control driving, the ECU cancels the cruise control.

WIRING DIAGRAM


1 Check starter operation.

CHECK:Check that the starter operates normally and that the engine starts.

NG Proceed to engine troubleshooting(2JZ-GE: See page DI-24 , 2JZ-GTE: See page DI-169 ).

OK

DI4XZ-01

Input Signal Indicator Light Blinking Pattern

Turn PNP switchOFF (Shift to except D range)

LightON

OFF

SW ON

SW OFF

I02726

ON

(-) D (+)


923Author: Date:

1997 SUPRA (RM502U)


PREPARATION:See input signal check on page DI-662 .CHECK:Check the indicator light when shifting into except D position.OK:

The indicator light goes off when shifting into exceptD position.


NG

3 Check voltage between terminal D of cruise control ECU and body ground.

PREPARATION:Turn ignition switch ON.CHECK:Measure voltage between terminal D of cruise control ECU con-nector and body ground when shifting into D position and otherpositions.OK:

Shift Position Voltage

D position 10 - 14 V

Other positions Below 1 V


NG


924Author: Date:

1997 SUPRA (RM502U)

4 Check harness and connector between PNP switch and cruise control ECU(See page IN-28 ).


OK



Clutch switch OFF (Depressclutch pedal)

LightON

OFF

SW ON

SW OFF


925Author: Date:

1997 SUPRA (RM502U)

Clutch Switch Circuit

CIRCUIT DESCRIPTIONWhen the clutch pedal is depressed, the clutch switch sends a signal to the cruise control ECU. When thesignal is input to the cruise control ECU during cruise control driving, the cruise control ECU cancels cruisecontrol.

WIRING DIAGRAMRefer to park/neutral position switch circuit on page DI-694 .


1 Check starter operation.

CHECK:Check that the starter operates normally and that the engine starts.

NG Proceed to engine troubleshooting(2JZ-GE: See page DI-24 , 2JZ-GTE: See page DI-169 ).

OK


PREPARATION:See input signal check on page DI-662 .CHECK:Check the indicator light when the clutch pedal is depressed.OK:

The indicator light goes off when the clutch pedal isdepressed.


NG

DI4Y0-01

I02726

ON

(-) D (+)


926Author: Date:

1997 SUPRA (RM502U)

3 Check voltage between terminal D of cruise control ECU and body ground.

PREPARATION:Turn ignition switch ON.CHECK:Measure voltage between terminal D of cruise control ECU con-nector and body ground when the clutch pedal is depressed.OK:

Shift Position Voltage

ON (Pedal depressed) Below 1 V

OFF 10 - 14 V


NG

4 Check for open in harness and connector between ECU and GAUGE fuse(See page IN-28 ).


OK


N19616

2

1B 1J I19 I19 1J 1I

1J 1H C16

C16

Cruise Control ECU


Battery

R/B No.2

4 4

1 13

2 4 5 9W

14

13

IE

W-B

W-B

J/B No.1

Ignition SwitchJ/B No.1 J/B No.1

AM

1A

LT

GND

B

2

2

2A

W-BW-B

W B-Y B-RECU-IG

B

W


927Author: Date:

1997 SUPRA (RM502U)

ECU Power Source Circuit

CIRCUIT DESCRIPTIONThe ECU power source supplies power to the actuator and sensors, etc.. When terminal GND and the cruisecontrol ECU case are grounded.

WIRING DIAGRAM

DI4Y1-01

N08843

J/B No.1ECU-IG Fuse

I02728

ON

GND (-) B (+)


928Author: Date:

1997 SUPRA (RM502U)


1 Check ECU-IG fuse.

PREPARATION:Remove ECU-IG fuse from junction block No.1.CHECK:Check continuity of ECU-IG fuse.OK:

Continuity

NG Check for short in all the harness and compo-nents connected to ECU-IG fuse.

OK

2 Check voltage between terminals B and GND of cruise control ECU connector.

PREPARATION:Remove cruise control ECU with connector still connected.CHECK:(a) Turn ignition switch ON.(b) Measure voltage between terminals B and GND of cruise

control ECU connector.OK:

Voltage 10 - 14 V


NG

N19842

GND


929Author: Date:

1997 SUPRA (RM502U)

3 Check resistance between terminal GND of cruise control ECU connector andbody ground (See page IN-28 ).

CHECK:Measure resistance between terminal GND of cruise controlECU connector and body ground.OK:



OK

Check and repair harness and connector be-tween battery and cruise control ECU(See page IN-28 ).

N19617

Battery

2A 1B 1H C16

1582222

R/B No.2J/B No.1

Cruise Control ECU

ECU-B W-R

B

1 ALT POWER

BATT

W-LW


930Author: Date:

1997 SUPRA (RM502U)

Back-up Power Source Circuit

CIRCUIT DESCRIPTIONThe ECU back-up power source provides power even when the ignition is off and is used for DTC memory,etc..

WIRING DIAGRAM

DI4Y2-01

N09001

J/B No.2

DOME Fuse

N19843

(-) BATT (+)


931Author: Date:

1997 SUPRA (RM502U)


1 Check DOME fuse.

PREPARATION:Remove DOME fuse from relay block No.2.CHECK:Check continuity of DOME fuse.OK:

Continuity

NG Check for short in all the harness and compo-nents connected to the DOME fuse.

OK

2 Check voltage between terminal BATT of cruise control ECU connector and bodyground (See page IN-28 ).

PREPARATION:Remove cruise control ECU with connector still connected.CHECK:Measure voltage between terminal BATT of cruise control ECUconnector and body ground.OK:

Voltage: 10 - 14 V


NG

Check and repair harness and connector be-tween battery and cruise control ECU(See page IN-28 ).

I02730

ON

(-) CMS (+)


932Author: Date:

1997 SUPRA (RM502U)

Main Switch Circuit (Cruise Control Switch)

CIRCUIT DESCRIPTIONWhen the cruise control main switch is turned off, the cruise control does not operate.



1 Check voltage between terminal CMS of cruise control ECU connector and bodyground.

PREPARATION:Remove cruise control ECU with connector still connected.CHECK:(a) Turn ignition switch ON.(b) Measure voltage between terminal CMS of cruise control

ECU connector when main switch is held on and off.OK:

Main switch Voltage

OFF 10 - 14 V

ON Below 1 V


NG

DI4Y3-01

N15969

3 5


933Author: Date:

1997 SUPRA (RM502U)

2 Check main switch continuity.

PREPARATION:(a) Remove steering wheel center pad (See page SR-1 1).(b) Disconnect cruise control switch connector.CHECK:Check continuity between terminals 3 and 5 of cruise controlswitch connector when main switch is held on and off.OK:

Switch position Tester connection Specified condition

OFF 3 - 5 No continuity

Hold ON 3 - 5 Continuity

NG Replace control switch.

OK

3 Check harness and connector between cruise control ECU and main switch(See page IN-28 ).


OK


N19618

I18

I18

1J

1B

1J 1E C10 C12 IF2

2A

4

4

2

4

5 12 9 6

1110

7O

DLC2

PI

Cruise Control ECU

1222

R/B No.2

J/B No.1


Y

R BR

4

W

Ignition Switch

AM1 ALT Battery

IF

GAUGE

J/B No.1

C10 C12

C16W

BR

BR

I8

W B

O OO

Combination MeterCRUISE Indicator

CRUISE

R


934Author: Date:

1997 SUPRA (RM502U)

CRUISE MAIN Indicator Light Circuit

CIRCUIT DESCRIPTIONWhen the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.

WIRING DIAGRAM

DI4Y4-01

I02732

ON

(-) PI (+)


935Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminals PI and GND of cruise control ECU connector.

PREPARATION:Ignition switch ON.CHECK:Measure voltage between terminals PI and GND of cruise con-trol ECU connector when main switch on and off.OK:

Switch position Voltage

OFF 10 - 16 V

ON Below 1.2 V


NG

2 Check combination meter (See page BE-43 ).

NG Replace combination meter.

OK


I02733

DLC2

DLC1

TC4D5

R

TC11D1 P-B* 1 21

II111IF1

R

R 8C16

Cruise Control ECU

TC

P-BR*2

*1: 2JZ-GTE*2: 2JZ-GE


936Author: Date:

1997 SUPRA (RM502U)

Diagnosis Circuit

CIRCUIT DESCRIPTIONThis circuit sends a signal to the ECU that DTC output is required.

WIRING DIAGRAM

DI4Y5-01

N15970

DLC1

E1 Tc


937Author: Date:

1997 SUPRA (RM502U)


1 Check voltage between terminals Tc and E 1 of DLC2.

CHECK:(a) Turn ignition switch ON.(b) Measure voltage between terminals Tc and E1 of DLC2.OK:

Voltage: 10 - 14 V


NG

2 Check harness and connector between cruise control ECU and DLC2, DLC2 andbody ground (See page IN-28 ).


OK


Diagnostics-Other

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