Acura 2.5TL 3.2TL (1995 -1998 ) Service Manual_Part2

5/27/2018 Acura 2.5TL 3.2TL (1995 -1998 ) Service Manual_Part2

1/200

Powertrain Control Module (PCM)

NOTE: If this symptomis intermittent, check for a loose fuse No. 1 (BACK UP

LIGHTS, METER LIGHTS, 10 A) in the under-dash fuse/relay box, a poor con-nection at PCM terminal A7, or an intermittent open in the GRN/RED wire

between the PCM (A7) and the gauge assembly.

Is the low oil pressure light on?

Try to start the engine.

Does the engine start?

Check for an open in the wire or

bulb (MIL line):1. Turn the ignition switch OFF.2. Connect the PCM connector ter-

minal A7 to body ground with ajumper wire.

3. Turn the ignition switch ON (II).

Is the MIL on?

Substitute a known-good PCM,and recheck. If symptom/indica-

tion goes away, replace the origi-nal PCM.

Repair short or open in the

wire between NO. 1 (BACK-UPLIGHTS, METER LIGHTS) (10

A) fuse and gauge assembly.

Replace No. 1 (BACK-UPLIGHTS, METER LIGHTS) (10 A)

fuse.

PCM CONNECTOR A (26P)

Check for an open in the wires

(PG1, PG2 lines):


2. Measure voltage between

body ground and PCM con-

nector terminals A12 and A25

individually.

Wire side of female terminals

Is there less than 1.0 V?

Repair open in the wire(s)

between PCM and G101 (locatedat intake manifold) that hadmore than 1.0 V.


J UMPER WIRE


Repair open in the wires

between PCM (A7) and gaugeassembly.

Replace the MIL bulb.

Substitute a known-good PCM

and recheck. If symptom/indica-tion goes away, replace the origi-nalPCM.

Turn the ignition switch ON (II).

The Malfunction Indicator Lamp(MIL) never comes on (even for

two seconds) after ignition isturned on (II).

Main Menu Table of Contents


2/200

PGM-FI System

Powertrain Control Module (PCM) (cont'd)

The Malfunction Indicator Lamp(MIL) stays on or comes on after

two seconds.

Check the Diagnostic TroubleCode (DTC):

1. Connect a scan tool or HondaPGM Tester.

2. Turn the ignition switch ON (II).3. Read the DTC with the scan

tool or Honda PGM Tester.

Are any DTC(s) indicated?

Check the DTC by MIL indication:1. Turn the ignition switch OFF.2. Connect the SCS service con-

nector to the service check

connector.3. Turn the ignition switch ON (II).

Does the MIL indicate any DTC?

Try to start the engine.

Does the engine start?

NOTE:When there is no Diagnostic Trouble Code (DTC) stored, the MIL will stay on if the SCS service

connector is connected and the ignition switch is on.If this symptom is intermittent, check for: A loose ECU (PCM) (20 A) fuse in the under-hood fuse/relay box A loose No. 2 FUEL PUMP (10 A) fuse in the under-dash fuse/relay box An intermittent short in the wire between the PCM (C5) and the service check connector

An intermittent short in the wire between the PCM (A7) and the gauge assembly An intermittent short in the wire between the PCM (D10) and the MAP sensor An intermittent short in the wire between the PCM (D21) and the TP sensor, EGR valve lift

sensor, TCS control valve angle sensor, Fuel tank pressure sensor*See the OBD II scan tool or Honda PGM Tester user's manuals for specific operating instruc-tions.: '97 - 98 models

Go to troubleshooting procedures.(see page11-32)

Repair open or short in wirebetween the PCM (D4) andData Link Connector.Go to troubleshooting proce-dures. (see page11-32)

PCM CONNECTOR C (12P)

Check for a short in the wire (SCSline):1. Stop the engine and turn the

ignition switch ON (II).2. Measure voltage between the

PCM connector terminal C5and body ground.

(To page11-55)


Is there approx. 5 V?

(To page11-55)

Repair short to body ground inthe wire between PCM (C5) and

service check connector.

http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/


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(From page11-54)

Check for a short in the wire (MILline):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor A (26P).3. Turn the ignition switch ON (II).

Is the MIL ON?Repair short to body ground inthe wire between the PCM (A7)andMIL.

Substitute a known-good PCMand recheck. If symptom/indica-tion goes away, replace the origi-nalPCM.

(From page11-54)

Is the fuse OK?

Inspect IG1 IG COIL (30 A) fuse inthe ignition coil fuse holder box.

Repair short in the wirebetween ECU (PCM) (20 A)fuse and PGM-FI main relay.Replace ECU (PCM) (20 A)fuse.

Is the fuse OK?

Repair short in the wirebetween IG1 IG COIL (30 A)fuse and PGM-FI main relay.

Replace IG1 IG COIL (30 A)

Check for a short in a sensor:1. Turn the ignition switch ON (II).2. Disconnect the 3P connector

of each sensor one at time:MAP sensor

TP sensorEGR valve lift sensor

TCS control valve angle sen-sorFuel tank pressure sensor('97-98 models)

Does the MIL go OFF momen-tarily?

Replace the sensor that causedthe light to go out.

(To page11-56)



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PGM-FI System

Powertrain Control Module (PCM) (cont'd)

(From page11-55)

Check for a short in the wires(VCC lines):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor D (22P).

3. Check for continuity betweenbody ground and PCM con-nector terminals D10 and D21individually.

Is there continuity?

Is there battery voltage?

Check for an open in the wires(LG lines):1. Reconnect all sensor connec-

tors.2. Reconnect the PCM connector

D (22P).3. Turn the ignition switch ON (II).4. Measure voltage between

body ground and PCM connec-tor terminals A26 and B9 indi-vidually.


Substitute a known-good PCMand recheck. If symptom/indica-tion goes away, replace the origi-nal PCM.

PCM CONNECTOR D (22P)

Repair short to body groundin the wire between PCM(D10) and MAP sensor.

Repair short to body ground inthe wire between PCM (D21)

and EGR valve lift sensor, TPsensor, TCS control valveangle sensor or fuel tank pres-sure sensor ('97 - 98 models).


A(26P)

PCM CONNECTORS

Repair open in the wire(s)between PCM (A13, B1) andPGM-FI main relay.Check for poor connectionsor loose wires at the PGM-FImain relay.

Test the PGM-FI main relay(see page11-129).


PCM CONNECTORS

A(26P) B(16P)

Repair open in the wire(s)between PCM (A26, B9) andG101 that had more than 1.0 V.


Check for an open in the wires(IGP lines):1. Turn the ignition switch ON (II).2. Measure voltage between body

ground and PCM connectorterminals A13 and B1 individu-ally.

B (16P)

http://tl9598a11129a.pdf/http://tl9598a11129a.pdf/http://tl9598a11129a.pdf/


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Idle Control System

System Description

The idle speed of the engine is controlled by the Idle Air Control (IAC) Valve.

The valve changes the amount of air bypassing into the intake manifold in response to electric current controlled by the

PCM. When the IAC Valve is activated, the valve opens to maintain the proper idle speed.

ENGINECOOLANT

IAC VAL VE

INTAKEMANIFOLD

PCM

FromPGM-FIMAINRELAY

FAST

IDLE

THERMO

VALVE

IDLE

ADJ USTINGSCREW

VARIOUS

SENSORS

ENGINECOOLANT



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Idle Control System

System Description (cont'd)

1. After the engine starts, the IAC valve opens for a certain time. The amount of air is increased to raise the idle speed

about 150-300 rpm.

2. When the coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The amount of

bypassed air is thus controlled in relation to the engine coolant temperature.

IDLE SPEED(rpm)

ENGINECOOLANT TEMPERATURE

3. When the idle speed is out of specification and the scan tool does not indicate Diagnostic Trouble Code (DTC) P0505 or

P1508, check the following items:

Adjust the idle speed (see page 11-114)

Air conditioning signal (see page 11-104)

ALT FR signal (see page11-106)

Starter switch signal (see page11-107)

A/T gear position signal (see page11-108)

PSP switch signal (see page11-110)

Brake switch signal (see page11-112)

Fast idle thermo valve (see page 11-113)

Hoses and connections

IAC valve and its mounting O-rings

4. If the above items are normal, substitute a known-good IAC valve and readjust the idle speed (see page11-114).

If the idle speed still cannot be adjusted to specification (and the scan tool does not indicate DTC P0505 or P1508)

after IAC valve replacement, substitute a known-good PCM and recheck. If symptom goes away, replace the original

PCM.

http://tl9598a11114a.pdf/http://tl9598a11114a.pdf/http://tl9598a11104a.pdf/http://tl9598a11104a.pdf/http://tl9598a11106a.pdf/http://tl9598a11106a.pdf/http://tl9598a11106a.pdf/http://tl9598a11107a.pdf/http://tl9598a11107a.pdf/http://tl9598a11107a.pdf/http://tl9598a11108a.pdf/http://tl9598a11108a.pdf/http://tl9598a11108a.pdf/http://tl9598a11110a.pdf/http://tl9598a11110a.pdf/http://tl9598a11110a.pdf/http://tl9598a11112a.pdf/http://tl9598a11112a.pdf/http://tl9598a11112a.pdf/http://tl9598a11113a.pdf/http://tl9598a11113a.pdf/http://tl9598a11114a.pdf/http://tl9598a11114a.pdf/http://tl9598a11114a.pdf/http://tl9598a11114a.pdf/http://tl9598a11113a.pdf/http://tl9598a11112a.pdf/http://tl9598a11110a.pdf/http://tl9598a11108a.pdf/http://tl9598a11107a.pdf/http://tl9598a11106a.pdf/http://tl9598a11104a.pdf/http://tl9598a11114a.pdf/


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Idle Control System

Air Conditioning Signal

This signals the PCM when there is a demand for cooling from the air conditioning system.

Inspection of Air ConditioningSignal.

Check for a short in the wire(ACS line):1. Turn the ignition switch OFF.2. Disconnect the A/C pressure

switch A connector and radia-tor fan diode connector.

3. Turn the ignition switch ON (II).4. Measure voltage between

PCM connector terminals C2andA26.


Check for an open in the wire(ACC line):1. Turn the ignition switch OFF.2. Reconnect the A/C pressure

switch A connector and radia-tor fan diode connector.

3. Turn the ignition switch ON (II).4. Momentarily connect PCM

connector terminals A8 andA26 with a jumper wire sever-al times.

(To page11-105)

A(26P)

PCM CONNECTORS

C(12P)


Check for a short in the wire (ACSline):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor C (12P).3. Check for continuity between

body ground and PCM con-nector terminal C2.


Repair short in the wire betweenthe PCM (C2) and the A/C pres-sure switch A or radiator fandiode.

Substitute a known-good PCMand recheck. If prescribed volt-age is now available, replacethe original PCM.See the air conditioner inspec-tion (seesection 22).


Wire side of femaleterminals

J UMPERWIRE



8/200

(From page11-104)

Is there a clicking noise fromthe A/C compressor clutch?

Check for the operation of theA/C:1. Start the engine.2. Turn the blower switch ON.3. Turn the A/C switch ON.

Does the A/C operate?

Air conditioning signal is OK.

Check for an open in the wire(ACC line):Momentarily connect the A/Cclutch relay 4P connector termi-nal No. 2 to body ground with a

jumper wire several times.

A/C CLUTCH RELAY CONNECTOR (C308)

J UMPERWIRE

Wire side offemale terminals

Is there a clicking noise fromthe A/C compressor clutch? See air conditioner inspection(seesection 22).

Repair open in the wire betweenthe PCM (A8) and the A/C clutchrelay.

PCM CONNECTORS

A(26P)

Check for an open in the wire(ACS line):Measure voltage between PCM

connector terminals A26 and C2.


Is voltage less than 1.0 V?

Repair open in the wire betweenthe PCM (C2) and the A/C pres-sure switch A or radiator fandiode.

Substitute a known-good PCMand recheck. If symptom/indi-cation goes away, replace theoriginal PCM.See the air conditioner inspec-tion (seesection 22).

C(12P)

http://tl959822index.pdf/http://tl959822index.pdf/http://tl959822index.pdf/http://tl959822index.pdf/http://tl959822index.pdf/http://tl959822index.pdf/http://tl959822index.pdf/


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Idle Control System

Alternator (ALT) FR Signal

This signals the PCM when the Alternator (ALT) is charging.


Check the operation of the ALT:1. Turn the ignition switch OFF.2. Reconnect the ALT GRN 4P

connector to the ALT.3. Start the engine. Hold the

engine at 3,000 rpm with noload (transmission in or

position) until the radiator fancomes on, then let it idle.4. Measure voltage between PCM

connector terminals D5 and A26.

Does the voltage decrease whenheadlights and rear defogger areturned on?

Check for an open in the wire (ALTF line):

1. Turn the ignition switch OFF.2. Disconnect the negative bat-

tery cable from the battery.3. Disconnect the PCM connec-

tor D (22P).

4. Disconnect the GRN 4P con-nector from the ALT.

5. Connect the ALT 4P connectorterminal No. 2 to body groundwith a jumper wire.

6. Check for continuity betweenbody ground and PCM con-nector terminal D5.


See the ALT inspection (seesection 23).

PCM CONNECTORS

A(26P) D(22P)

LG1 (BRN/BLK)


Check for a short in the wire (ALTF line):

1. Turn the ignition switch OFF.2. Disconnect the negative bat-

tery cable from the battery.3. Disconnect the PCM connector

D (22P).

4. Check for continuity betweenbody ground and PCM con-nector terminal D5.

D (22P)

Is there continuity?Repair short in the wire betweenthe PCM (D5) and the ALT.

Substitute a known-good PCMand recheck. If prescribed voltageis now available, replace the origi-nal PCM.

ALT FR signal is OK.

ALT GRN 4P CONNECTOR (C129)

J UMPER WIRE


Repair open wire between thePCM(D5)and theALT.


PCM CONNECTOR D (22P)

Check for a short in the wire (ALTF line):1. Disconnect the GRN 4P con-

nector from the ALT.2. Turn the ignition switch ON (II).3. Measure voltage between PCM

connector terminals D5 and A26.

Inspection of ALT FR Signal.

http://tl959823indxb.pdf/http://tl959823indxb.pdf/http://tl959823indxb.pdf/


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Starter Switch Signal

This signals the PCM when the engine is cranking.

PCM CONNECTORS

A(26P) C(12P)



Is the fuse OK?

Repair short in the wire be-tween the PCM (C6) and theNo. 9 STARTER SIGNAL (7.5A) fuse or the PGM-FI mainrelay.Replace the No. 9 STARTERSIGNAL (7.5 A) fuse.

Repair open in the wire betweenthe PCM (C6) and the No. 9STARTER SIGNAL (7.5 A) fuse.

Starter switch signal is OK.

Inspect the No. 9 STARTER SIG-NAL (7.5 A) fuse in the under-dashfuse/relay box.

Check for an open or short in thewire (STS line):Measure voltage between PCMconnector terminals C6 and A26with the ignition switch in thestart position (III).

Inspection of Starter Switch Sig-nal. NOTE: Transmission in or position.



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Idle Control System

Automatic Transaxle (A/T) Gear Position/Signal

This signals the PCM when the transmission is in or position.

Does the indicator light prop-erly?

See the A/T gear position indica-tor inspection (seesection 23).

PCM CONNECTORS

Check for a short in the wire (ATPPN line):1. Turn the ignition switch OFF.2. Disconnect the 16P connector

from the gauge assembly.

3. Turn the ignition switch ON (II).4. Measure voltage between PCM

connector terminals E24 andA26.

A (26P) E (26P)



Is there continuity?Repair short in the wire betweenthe PCM (E24) and the gaugeassembly.

(To page11-109)

Inspection of A/T Gear PositionSignal.

Check the operation of the A/Tgear position switch:1. Turn the ignition switch ON (II).2. Observe the A/T shift position

indicator and select each posi-tion separately.

Check for a short in the wire (ATPPN line):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor E (26P).3. Check for continuity between

body ground and PCM con-nector terminal E24.

Substitute a known-good PCMand recheck. If prescribed volt-age is now available, replace theoriginal PCM.

http://tl959823indxa.pdf/http://tl959823indxa.pdf/http://tl959823indxa.pdf/http://tl959823indxa.pdf/http://tl959823indxa.pdf/


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(From page11-108)

Check for an open in the wire (ATPPN line):1. Turn the ignition switch OFF.2. Reconnect the 16P connector

to the gauge assembly.3. Start the engine.4. Measure voltage between PCM

connector terminals E24 andA26 with the transmission in

position.

PCM CONNECTORS

A(26P) E(26P)


Is there less than 1.0 V?Repair open in the wire betweenthe PCM (E24) and the gaugeassembly.

Check for an open in the wire(ATP

PNline):Measure voltage between PCMconnector terminals E24 and A26with the transmission in posi-tion.

Is there less than 1.0 V?Repair open in the gauge assem-bly.

A/T gear position signal is OK.



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Idle Control System

Power Steering Pressure (PSP) Switch Signal

This signals the PCM when the power steering load is high.

Inspection of PSP switch signal.

Check for an open in the wire (PSPSW line):1. Turn the ignition switch ON (II).2. Measure voltage between PCM

connector terminals B3 and A26.


Check the operation of the PSPswitch:1. Start the engine2. Turn steering wheel to full

lock.

3. Measure voltage between PCMconnector terminals B3 and A26.


PCM CONNECTORS

A(26P) B(16P)

Check for an open in the wire (PSPSW line):

1. Turn the ignition switch OFF.2. Disconnect the PSP switch 2P

connector.3. Turn the ignition switch ON (II).4. At the harness side, connect

the PSP switch 2P connectorterminals No. 1 and No. 2with a jumper wire.

5. Measure voltage between PCMconnector terminals B3 and A26.



Repair open in the wire be-tween the PCM (B3) and the

PSP switch. Repair open in wire between

the PCM (D22)and the PSPswitch.

(To page11-111)PSP switch signal is OK.

Replace the PSP switch.


J UMPERWIRE

PSP SWITCH CONNECTOR (C110)



14/200

(From page11-110)

Check for a short in the PSPswitch:

1. Turn the ignition switch OFF.

2. Disconnect the 2P connectorfrom the PSP switch.


4. Measure voltage between PCM

connector terminals B3 and A26.

PCM CONNECTORS



Is there continuity?Repair short in the wire betweenthe PCM (B3) and the PSP switch.

Substitute a known-good PCMand recheck. If prescribed volt-age is now available, replace theoriginal PCM.

Replace the PSP switch.



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Idle Control System

Brake Switch Signal

This signals the PCM when the brake pedal is depressed.

Inspection of Brake Switch Signal.

Are the brake lights on withoutdepressing the brake pedal?

Inspect the brake switch (seesection 19).

Depress the brake pedal.

Do the brake lights come on?

Is the fuse OK?

Check for an open in the wire(BKSW line):1. Depress the brake pedal.2. Measure voltage between PCM

connector terminals E2 and

A26 with the brake pedal de-pressed.

Repair short in the wire be-tween the brake switch and

the STOP HORN (20 A) fuse.Replace the STOP HORN (20 A)fuse.

Repair open in the wire be-tween the brake switch andthe STOP HORN (20 A) fuse.Inspect the brake switch (seesection 19).

A(26P)PCM CONNECTORS

E(26P)


Is there battery voltage? Repair open in the wire betweenthe PCM (E2) and the brake switch.

Brake switch signal is OK.

Inspect the STOP HORN (20 A)

fuse in the under-hood fuse/ relaybox.

http://tl959819index.pdf/http://tl959819index.pdf/http://tl959819index.pdf/http://tl959819index.pdf/http://tl959819index.pdf/http://tl959819index.pdf/


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Fast Idle Thermo Valve

Description

To prevent erratic running when the engine is warming

up, it is necessary to raise the idle speed. The fast idlethermo valve is controlled by a thermowax plunger.

When the engine is cold, the engine coolant surround-

ing the thermowax contracts the plunger, allowing addi-

tional air to be bypassed into the intake manifold so that

the engine idles faster. When the engine reaches operat-

ing temperature, the valve closes, reducing the amount

of air bypassing into the intake manifold.

FAST

IDLE

THERMO

VALVE

IDLE

ADJ USTING

SCREW

IAC

VALVE

AIR BYPASS

VALVE

WAX

Inspection

NOTE: The fast idle thermo valve is factory adjusted; itshould not be disassembled.

1. Remove the cover of the fast idle thermo valve.

2. Start the engine.

3. Put your finger on the valve seat area and make sure

that there is air flow with the engine cold (engine

coolant temperature below 86F, 30C) and idling.

FAST

IDLE

THERMOVALVE

If not, replace the fast idle thermo valve and retest.O-RINGS

Replace.

12 N-m

(1.2 kgf-m, 8.7 Ibf-ft)

4.

5.

Start the engine. Hold the engine at 3,000 rpm with no

load (transmission in or position) until the radia-

tor fan comes on, then let it idle.

Check that the valve is completely closed. If not, air

suction can be felt in the valve seat area.

If any suction is felt, the valve is leaking.

Check engine coolant level and for air in the engine

cooling system (seesection 10).If OK, replace the fast idle thermo valve and

recheck.

NOTE: If the cover of fast idle thermo valve was removed,

do the PCM reset procedure.

http://tl959810index.pdf/http://tl959810index.pdf/http://tl959810index.pdf/http://tl959810index.pdf/


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Idle Control System

Idle Speed Setting

Inspection/Adjustment

NOTE:

Before setting the idle speed, check the following

items:

The MIL has not been reported on.

Ignition timing

Spark plugs

Air cleaner (ACL)

PCV system

(Canada) Pull the parking brake lever up. Start the

engine, then check that the headlights are off.

1. Start the engine. Hold the engine at 3,000 rpm with

no load (transmission in or position) until theradiator fan comes on, then let it idle.

2. Connect a OBDII scan tool (see page 11-32) ortachometer.

Connect a tachometer to the ignition controlmodule (ICM) secondary, or...

TACHOMETER

ICM

Remove the rubber cap from the tachometerconnector and connect a tachometer.

TACHOMETER TACHOMETER

CONNECTOR

RUBBER

CAP

3. Disconnect the IAC valve connector.

4.

5.

IAC VALVE

Start the engine with the accelerator pedal slightly

depressed. Stabilize the rpm at 1,000, then slowly

release the pedal until the engine idles.

Check idling in no-load conditions: headlights, blow-er fan, rear defogger, radiator fan, and air conditioner

are not operating.

Idle speed should be:

480 50 rpm

(in or position)

Adjust the idle speed, if necessary, by turning the

idle adjusting screw.

NOTE: After adjusting the idle speed in this step,

recheck the ignition timing (seesection 23).If it is out of spec, go back to step 4.

IDLE ADJ USTING SCREW

http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl959823indxb.pdf/http://tl959823indxb.pdf/http://tl959823indxb.pdf/http://tl959823indxb.pdf/http://tl9598a11032a.pdf/


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6. Turn the ignition switch OFF.

7. Reconnect the 2P connector on the IAC valve, thendo the PCM reset procedure.

8. Restart and idle the engine with no-load conditions

for one minute, then check the idle speed.

NOTE: (Canada) Pull the parking brake lever up.

Start the engine, then check that the headlights are

off.


640 50 rpm

(in or position)

9. Idle the engine for one minute with headlights (Low)

ON and check the idle speed.


650 50 rpm

(in or position)

10. Turn the headlights off.

Idle the engine for one minute with heater fan switch

at HI and air conditioner on, then check the idle speed.


650 50 rpm

(in or position)

NOTE: If the idle speed is not within specification,

see Symptom Chart on page11-36.

http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/http://tl9598a11032a.pdf/


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Fuel Supply System

Fuel Lines

NOTE: Check fuel system lines, hoses, filter and other components for damage, leaks or deterioration, and replace if nec-essary.

22 N-m'96 model: (2.2 kgf-m,

16 Ibf-ft)22 N-m(2.2 kgf-m,16 Ibf-ft)

37 N-m(3.8 kgf-m, 27 Ibf-ft)

'97 - 98 models:

22 N-m(2.2 kgf-m, 16 Ibf-ft)

27 N-m

(2.8 kgf-m, 20 Ibf-ft)

37 N-m(3.8 kgf-m, 27 Ibf-ft)



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NOTE: Check all hose clamps and retighten if necessary.

'96 model:

ToFUELPRESSUREREGULATOR

FUEL GAUGE SENDINGUNIT ASSEMBLY

FUEL' FILTER

EVAPORATIVE EMISSION(EVAP) TWO WAY VALVE

FUEL PUMPASSEMBLY

EVAPORATIVE EMISSION(EVAP) CONTROLCANISTER

10-15 mm

(0.39-0.59in)

Clamp in the middle.


O-RINGReplace.

O-RINGReplace.

FUELTANK



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Fuel Supply System

Fuel Lines (cont'd)

'97 - 98 models:

ToFUELPRESSURE

REGULATOR

FUELFILTER

FUEL GAUGE SENDINGUNIT ASSEMBLY

BASE GASKETReplace.

FUEL PUMP

ASSEMBLY

EVAPORATIVE EMISSION(EVAP) TWO WAY VALVE

EVAPORATIVE EMISSION(EVAP) CONTROL

CANISTER

10- 15 mm(0.39-0.59 in)



FUEL

TANK



22/200

System Description

The fuel supply system consists of a fuel tank, in-tank

high pressure fuel pump, PGM-FI main relay, fuel filter,

fuel pressure regulator, fuel pressure regulator controlsolenoid valve, fuel injectors, and fuel delivery and return

lines. This system delivers pressure-regulated fuel to the

fuel injectors and cuts the fuel delivery when the engineis not running.



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Fuel Pressure

Relieving

Before disconnecting fuel pipes or hoses, release pres-sure from the system by loosening the service bolt ontop of the fuel rail ('97 - 98 models: top of fuel filter).

Do not smoke while working on the fuel system.

Keep open flames or sparks away from your work

area.

Be sure to relieve fuel pressure while the ignition

switch is off.

1. Make sure you have the anti-theft code for the radio,

then write down the frequencies for the radio's pre-

set buttons.

2. Disconnect the battery negative cable from the bat-

tery negative terminal.

3. Remove the fuel fill cap.

4. Use a box end wrench on the service bolt on the

fuel rail ('97 model: on the fuel filter) while holding

the banjo bolt with another wrench.

5. Place a rag or shop towel over the service bolt.

6. Slowly loosen the service bolt one complete turn.

'96 model: SERVICEBOLT12 N-m(1.2 kgf-m, 8.7 Ibf-ft)

FUEL RAIL SHOP TOWEL

'97 - 98 models:

SERVICE BOLT

12 N-m (1.2 kgf-m,8.7 Ibf-ft)

FUELFILTER

SHOPTOWEL

NOTE:

A fuel pressure gauge can be attached at the ser-

vice bolt hole.

Always replace the washer between the service

bolt and the banjo bolt whenever the service bolt

is loosened.

Replace all washers whenever the bolts areremoved.

(cont'd)



24/200

Fuel Supply System

Fuel Pressure (cont'd)

Inspection

1. Relieve fuel pressure (see page11-119).

2. Remove the service bolt on the fuel rail ('97 - 98

models: on the fuel filter) while holding the banjo

bolt with another wrench. Attach the special tool.

'96 model: FUELPRESSUREGAUGE07406-0040001

CLAMP

'97 - 98 models:

CLAMP

FUEL

PRESSUREREGULATOR

FUELPRESSUREGAUGE07406-0040001

FUEL FILTER

3.

FUELPRESSUREREGULATOR

Start the engine. Measure the fuel pressure with the

engine idling and the vacuum hose of the fuel pres-

sure regulator disconnected from the fuel pressure

regulator and pinched. If the engine will not start, turn

the ignition switch ON (II), wait for two seconds, turn

it OFF, then back on again and read the fuel pressure.

Pressure should be:

260 - 310 kPa (2.65 - 3.15 kgf/cm2, 38 - 45 psi)

4. Reconnect vacuum hose to the fuel pressure regula-

tor.

Pressure should be:

190 - 240 kPa (1.94 - 2.45 kgf/cm2, 28 - 35 psi)

If the fuel pressure is not as specified, first check the

fuel pump (see page 11-128). If the fuel pump is OK,

check the following:

If the fuel pressure is higher than specified,

inspect for:

Pinched or clogged fuel return hose or line. Faulty fuel pressure regulator (see page11-124).

If the fuel pressure is lower than specified, inspectfor: Clogged fuel filter.

Faulty fuel pressure regulator (see page11-124).

Leakage in the fuel line.

http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11128a.pdf/http://tl9598a11128a.pdf/http://tl9598a11124a.pdf/http://tl9598a11124a.pdf/http://tl9598a11124a.pdf/http://tl9598a11124a.pdf/http://tl9598a11124a.pdf/http://tl9598a11124a.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11124a.pdf/http://tl9598a11124a.pdf/http://tl9598a11128a.pdf/


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Fuel Injectors

Replacement

Do not smoke when working on the fuel system. Keep open flames away from your work area.


2. Remove the engine cover.

3. Disconnect the connectors from the fuel injectors.

4. Disconnect the vacuum hose and fuel return hose from the fuel pressure regulator.

NOTE: Place a rag or shop towel over the hoses before disconnecting them.

5. Disconnect the fuel hose from the fuel rail.

6. Remove the retainer nuts from the fuel rail and harness holder.

7. Disconnect the fuel rail.

8. Remove the fuel injectors from the intake manifold.

'96 model:

ENGINECOVER

O-RINGReplace.

CUSHIONRINGReplace.FUELINJ ECTOR

SEALRINGReplace.

HARNESSHOLDER

FUELRAILS

PCV

VALVE

12 N-m(1.2 kgf-m,8.7 Ibf-ft)

22 N-m(2.2 kgf-m,16 Ibf-ft)

http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/


26/200

Fuel Supply System

Fuel Injectors (cont'd)

'97 - 98 models:ENGINECOVER

HARNESSHOLDER

O-RING

Replace.

CUSHIONRINGReplace.

FUELINJ ECTOR

SEALRINGReplace.

9. Slide new cushion rings onto the fuel injectors.

10. Coat new O-rings with clean engine oil, and put them on the fuel injectors.

11. Insert the fuel injectors into the fuel rail first.

12. Coat new seal rings with clean engine oil and press them into the intake manifold.

13. Install the fuel injectors and fuel rail assembly in the intake manifold.

CAUTION: To prevent damage to the O-ring, install the fuel injectors in the fuel rail first, then install them in the

intake manifold.


PCVVALVE

FUELRAILS

12 N-m(1.2 kgf-m,'8.7 Ibf-ft)



27/200

14. Align the center line on the connector with the mark on the fuel rail.

15. Install and tighten the retainer nuts.

16. Connect the fuel hose to the fuel rail.

17. Connect the vacuum hose and fuel return hose to the fuel pressure regulator.

18. Install the connectors on the fuel injectors.

19. Install the engine cover.

20. Turn the ignition switch ON (ll) but do not operate the starter. After the fuel pump runs for approximately two seconds,

the fuel pressure in the fuel line rises. Repeat this two or three times, then check whether there is any fuel leakage.

FUELINJ ECTOR

MARKINGS

FUEL

RAIL

FUEL RAILINSULATOR

FUELRAILS



28/200

Fuel Supply System

Fuel Pressure Regulator

Description

The fuel pressure regulator maintains a constant fuel pres-

sure to the fuel injectors. When the difference between thefuel pressure and manifold pressure exceeds 250 kPa

(2.55 kgf/cm2, 36.3 psi), the diaphragm is pushed

upward, and the excess fuel is fed back into the fuel tank

through the return line.

CLOSED:

INTAKE MANIFOLD

VACUUM

DIAPHRAGM

FUEL

INLET

OPEN:INTAKE MANIFOLDVACUUM

FUEL RETURN

DIAPHRAGM

FUEL

INLET

Testing

Do not smoke during the test. Keep openflames away from your work area.

1. Attach the special tool to the service port on the fuel

rail ('97 - 98 models: fuel filter) (see page 11-120).

2. Start the engine.

Pressure should be:

260 - 310 kPa (2.65 - 3.15 kgf/cm2, 38 - 45 psi)

(with the fuel pressure regulator vacuum hose dis-

connected and pinched)

'96 model:FUEL

PRESSURE

GAUGE

07406 - 0040001

CLAMP

FUEL

PRESSURE

REGULATOR

'97 - 98 models:

FUELPRESSURE

REGULATOR

FUEL

PRESSUREGAUGE

07406 - 0040001

FUELFILTER

3. Reconnect the vacuum hose to the fuel pressure

regulator.

4. Check that the fuel pressure rises when the vacuum

hose from the fuel pressure regulator is disconnected

again. If the fuel pressure did not rise, replace the

fuel pressure regulator.

CLAMP

http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/http://tl9598a11119b.pdf/


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Troubleshooting Flowchart

No. 1 VACUUMHOSEVACUUMPUMP/GAUGEA973X - 041 - XXXXX

FUELPRESSUREREGULATOR

Is there manifold vacuum?

Is there vacuum?

Check the Fuel Pressure Regula-tor Control Solenoid Valve:1. Turn the ignition switch OFF.2. Disconnect the 4P connector

from the control box.3. Connect battery positive to

terminal No. 4 and batterynegative to terminal No. 3 onthe 4P connector.

4. Start the engine and allow itto idle.

Check the No. 1 and No. 3 vacu-um hose.If hoses are OK, replace the fuelpressure regulator control sole-noid valve.

Inspect for a short to ground inwire between PCM (A10) and the4P connector.If the wire is OK, substitute aknown-good PCM and recheck. Ifsymptom goes away, replace theoriginal PCM.

CONTROL BOX4P CONNECTOR (C218)

Is there manifold vacuum?Replace the fuel pressure regula-tor control solenoid valve.

Terminal side of maleterminals

(To page11-126)

Disconnect the 4P connectorfrom the control box.

Check for vacuum at idle:1. Start the engine. Hold the

engine at 3,000 rpm with noload (transmission in orposition) until the radiator fancomes on.

2. Disconnect the No. 1 vacuumhose from the fuel pressureregulator and connect a vac-

uum gauge to the hose.

Inspection of Fuel PressureRegulator Control Solenoid Valve.



30/200

Fuel Supply System

Fuel Pressure Regulator (cont'd)

(From page11-125)

Check for an open in the wire:Measure voltage between thecontrol box 4P connector termi-nal No. 4 and body ground.


Check for an open in the wire:1. Turn the ignition switch OFF.2. Reconnect the 4P connector

to the control box.3. Start the engine and allow it

to idle.4. Connect PCM connector ter-

minal A10 and body groundwith a jumper wire.

Is there manifold vacuum?

CONTROL BOX4P CONNECTOR (C218)

Repair open in wire betweenNo. 4 ECU(PCM)(15 A) or (20 A)

fuse in the under-dash fuse/relaybox and the 4P connector.




Repair open in wire betweenPCM (A10) and the 4P connector.

Fuel Pressure Regulator ControlSolenoid Valve is OK.

J UMPERWIRE



31/200

Replacement

Do not smoke while working on the fuelsystem. Keep open flame away from your work area.

1. Place a shop towel under the fuel pressure regula-

tor, then relieve fuel pressure (see page 11-119).

2. Disconnect the vacuum hose and fuel return hose.

3. Remove the two 6 mm retainer bolts.

NOTE:

Replace the O-ring.

When assembling the fuel pressure regulator,

apply clean engine oil to the O-ring and assemble

it into its proper position, taking care not to dam-

age the O-ring.

http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/


32/200

Fuel Filter

Replacement

Do not smoke while working on fuel system.

Keep open flame away from your work area.

While replacing the fuel filter, be careful to keep a safe

distance between battery terminals and any tools.

The fuel filter should be replaced whenever the fuel pres-

sure drops below the specified value [260 - 310 kPa

(2.65 - 3.15 kgf/cm2, 37.7 - 44.8 psi) with the fuel pressure

regulator vacuum hose disconnected and pinched] after

making sure that the fuel pump and the fuel pressure

regulator are OK.

1. Make sure you have the anti-theft code for the radio,

then write down the frequencies for the radio's pre-

set buttons.

2. Disconnect the battery negative cable from the bat-

tery negative terminal.

3. Place a shop towel under and around the fuel filter.


5. Remove the banjo bolt and the fuel feed pipe while

supporting the fuel filter with another wrench, as

shown.

6. Remove the fuel filter clamp and fuel filter.

7. When assembling, use new washers as shown.NOTE: Clean the flared joint of high pressure hoses

thoroughly before reconnecting them.

'96 model:

http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/http://tl9598a11119b.pdf/


33/200

Fuel Supply System

Fuel Filter (cont'd)

'97 - 98 models:

BANJ O BOLT22 N-m (2.2 kgf-m,16 Ibf-ft)

WASHERSReplace.

9.8 N-m(1.0 kgf-m,7.2 Ibf-ft)




34/200

Fuel Supply System

Fuel Pump

Testing

Do not smoke during the test. Keep open

flame away from your work area.

If you suspect a problem with the fuel pump, check that

the fuel pump actually runs; when it is ON, you will hear

some noise if you hold your ear to the fuel fill port with

the fuel fill cap removed. The fuel pump should run for

two seconds when ignition switch is first turned on. If

the fuel pump does not make noise, check as follows:

1. Remove the trunk floor.

2. Disconnect the 3P connector.

CAUTION: Be sure to turn the ignition switch OFF

before disconnecting the wires.

3. Disconnect the PGM-FI main relay connector and

connect the No. 2 terminal and No. 5 terminal* with

a jumper wire. *: 8P connector

4.

PGM-FI MAIN RELAY CONNECTORS

8P (C417)

J UMPER WIRE


Check that battery voltage is available between the

fuel unit sub-harness connector terminal No. 3 and

body ground when the ignition switch is turned ON (II).

FUEL UNIT SUB-HARNESSCONNECTOR (C519)

Terminal side of male terminals

If battery voltage is available, check the fuel pump

ground. If the ground is OK, replace the fuel

pump.

If there is no voltage, check the wire harness (see

page11-130).

4P (C418)

http://tl9598a11130a.pdf/http://tl9598a11130a.pdf/http://tl9598a11130a.pdf/http://tl9598a11130a.pdf/


35/200

PGM-FI Main Relay

Description

This PGM-FI main relay is located at the left side of the

cowl. The PGM-FI main relay actually contains two indi-vidual relays. One relay is energized whenever the igni-

tion is on. It supplies battery voltage to the PCM, power

to the fuel injectors, and power for the second relay. The

second relay is energized for two seconds when the

ignition is switched on, and when the engine is running.

It supplies power to the fuel pump.

PGM-FI

MAIN RELAYFUEL PUMP

Relay Testing

NOTE: If the car starts and continues to run, the PGM-FI

main relay is OK.

Remove the PGM-FI main relay.

Attach the battery positive terminal to the No. 3*

terminal and the battery negative terminal to the

No. 2* terminal of the PGM-FI main relay. Then

check for continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

If there is continuity, go on to step 3.

If there is no continuity, replace the relay and

retest.

No. 4 *: 8P CONNECTOR

3. Attach the battery positive terminal to the No. 4 ter-minal and the battery negative terminal to the No.

7* terminal of the PGM-FI main relay. Then check

that there is continuity between the No. 3 terminal

and No. 1 terminal of the PGM-FI main relay.

If there is continuity, go on to step 4,


retest.

4. Attach the battery positive terminal to the No. 1 ter-

minal and battery negative terminal to the No. 2*

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.If there is continuity, the relay is OK;

If the fuel pump still does not work, go to

Harness Testing on the next page.


retest.



36/200

Fuel Supply System

PGM-FI Main Relay (cont'd)


Engine will not start.Inspection of PGM-FI mainrelay and relay harness.

Check for an open in the wire (PG1line):1. Turn the ignition switch OFF.2. Disconnect the PGM-FI main

relay 4P connector and 8Pconnector.

3. Check for continuity betweenthe PGM-FI main relay 8Pconnector terminal No. 7 andbody ground.

PGM-FI MAIN RELAY 8P CONNECTOR (C417)



Repair open in the wire betweenthe PGM-FI main relay and G101(located at right middle ofengine).

Check for an open or short in thewire (BAT line):Measure voltage between thePGM-FI main relay 4P connectorterminal No. 3 and body ground.


BAT

(YEL/BLU)



Repair open or short in thewire between the PGM-FImain relay and the ECU (PCM)(20 A) fuse.Replace the ECU (PCM) (20 A)fuse in the under-hood fuse/relay box.

Check for an open or short in thewire (IGSW line):1. Turn the ignition switch ON (II).2. Measure voltage between the

PGM-FI main relay 8P connec-tor terminal No. 5 and bodyground.


(To page11-131)

Repair open or short in thewire between the PGM-FI

main relay and the No. 2 FUELPUMP (15 A) fuse.Replace the No. 2 FUEL PUMP(15 A) fuse in the under-dashfuse/relay box.



37/200

(From page 11-130)

Check for an open in the wire(IGSW line):Measure voltage between thePGM-FI main relay 4P connectorterminal No. 4 and body ground.



Repair open or short in thewire between the PGM-FImain relay and the IG COIL(30 A) fuse.

Replace the IG1 1G COIL (30A) fuse in the ignition coilfuse holder.


Check for an open or short in thewire (STS line):1. Turn the ignition switch to the

START (III) position (Trans-mission in [N] or [P] position).

2. Measure the voltage betweenthe PGM-FI main relay 8P con-nector terminal No. 3 andbody ground.



Repair open or short in thewire between the PGM-FImain relay and the No. 9STARTER SIGNAL (7.5 A) fuse.Replace the No. 9 STARTERSIGNAL (7.5 A) fuse in theunder-dash fuse/relay box.


Check for an open in the wire(FLR1 line):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor A (26 P) from the PCM.3. Check for continuity between

the PGM-FI main relay 8Pconnector terminal No. 2 andPCM connector terminal A4.


(To page11-132)

Repair open in the wire betweenthe PCM (A4) and the PGM-FImain relay.





38/200

Fuel Supply System

PGM-FI Main Relay (cont'd)

(From page11-131)

Check for an open in the wires(IGP1, IGP2 lines):1. Reconnect the PCM connector

A (26P).2. Reconnect the PGM-FI main

relay 4P and 8P connectors.3. Turn the ignition switch ON (II).4. Measure voltage between

PCM connector terminals A13and A12, and between termi-nals B1 and A12.

PCM CONNECTORS



Repair open in the wirebetween the PCM (A13, B1)and the PGM-FI main relay.Replace the PGM-FI mainrelay.

Check for an open in the PCM:1. Turn the ignition switch OFF.2. Measure voltage between

PCM connector terminals A4and A12 when the ignitionswitch is first turned ON (II)for two seconds.

Is there 1.0 V or less?

Substitute a known-good PCMand recheck. If prescribed volt-age is now available, replace the

original PCM.

Check the PGM-FI main relay(see page11-129).



39/200

Intake Air System

System Description

The systemsupplies air for all engine needs. It consists of the intake air pipe, Air Cleaner (ACL), intake air duct, Throttle

Body (TB), Idle Air Control (IAC) Valve, fast idle thermo valve, and intake manifold.

A resonator in the intake air pipe provides additional silencing as air is drawn into the system.

IAB LOW

CONTROLSOLENOIDVALVE

IAB HIGH

CONTROL SOLENOID VALVE

IAB LOW

CONTROL

DIAPHRAGM

VALVE

From PGM-FIMAIN RELAY

From No. 4 ECU

(PCM)(15 A)FUSE

(in the under-dash

fuse/relay box)

VARIOUSSENSORS

INTAKE

AIR

DUCT

FAST

IDLE

THERMOVALVE

IDLE

ADJ USTINGSCREW

ENGINECOOLANT

INTAKEMANIFOLD

PCM

IAB

VACUUM

TANKIAB

CHECK

VALVE

IAB HIGH

CONTROLDIAPHRAGM

VALVE



40/200

Intake Air System

Air Cleaner (ACL)

ACL Element Replacement

ACL HOUSING

COVER

ACL ELEMENT

Normal conditions:Replace air cleaner element every30,000 miles (48,000 km) or 24months whichever comes first.

Severe conditions:Clean air cleaner element every15,000 miles (24,000 km) or 12

months and replace every 30,000miles (48,000 km) or 24 months

whichever comes first.

ACLHOUSING



41/200

Throttle Cable

Inspection/Adjustment

1. Start the engine. Hold the engine at 3,000 rpm withno load (transmission in or position) until the

radiator fan comes on, then let it idle.

2. Check that the throttle cable operates smoothly with

no binding or sticking. Repair as necessary.

3. Check cable free play at the throttle linkage. Cable

deflection should be 10 - 12 mm (0.39 - 0.47 in.)

ADJ USTING NUT

CABLEBRACKET

DEFLECTION10-12 mm(0.39-0.47 in.)

4. If deflection is not within specs, loosen the locknut,

turn the adjusting nut until the deflection is as spec-

ified, then retighten the locknut.

5. With the cable properly adjusted, check the throttle

valve to be sure it opens fully when you push theaccelerator pedal to the floor. Also check the throttle

valve to be sure it returns to the idle position whenev-

er you release the accelerator pedal.

Installation

1. Fully open the throttle valve, then install the throttlecable in the throttle linkage and install the cablehousing in the cable bracket.

LOCKNUT INNER CAB LE

ADJ USTINGNUT

THR OTT L ELINKAGE

CABLEB RA C K E T

2. Start the engine. Hold the engine at 3,000 rpm withno load (transmission in or position) until the


3. Hold the cable sheath, removing all slack from the

cable.

4. Turn the adjusting nut until it is 3 mm (0.12 in.) away

from the cable bracket.

3 mm(0.12 in.)

ADJ USTINGNUT

LOCKNUT9.8 N-m(1.0 kg-m,7.2 Ibf-ft)

5.

CABLEBRACKET

Tighten the locknut. The cable deflection should now

be 10 - 12 mm (0.39 - 0.47 in.). If not, see inspection/

adjustment.

LOCKNUT



42/200

Intake Air System

Throttle Body

Description

The throttle body is a single-barrel side-draft type. The

lower portion of the throttle valve is heated by enginecoolant from the cylinder head. The idle adjusting screw,

which increases/decreases bypass air, and the Evapora-

tive Emission (EVAP) Control Canister port are located on

the top of the throttle body.

THROTTLE

POSITION(TP)

SENSOR

IDLE ADJUSTINGSCREW

THROTTLEVALVE

THROTTLESTOPSCREW(non-adjustable)

Inspection

CAUTION: Do not adjust the throttle stop screw. It is

preset at the factory.

1. Disconnect the vacuum hose (to the EVAP control

canister) from the top of the throttle body; connect

a vacuum gauge to the throttle body.

2. Start the engine. Hold the engine at 3,000 rpm withno load (transmission in ! or position) until the


VACUUM PUMP/GAUGEA973X - 041 - XXXXX

3. Allow the engine to idle, and check that the gauge

indicates no vacuum.

If there is vacuum, check the throttle cable (see

page11-135).

4. Check that vacuum is indicated on the gauge when

the throttle is opened slightly from idle.

If the gauge indicates no vacuum, check the throt-

tle body port. If the throttle body port is clogged,

clean it with carburetor cleaner.

5. Stop the engine, and check that the throttle cable

operates smoothly without binding or sticking.

If there are any abnormalities in the above steps,check for.

Excessive wear or play in the throttle valve shaft.

Sticky or binding throttle lever at full close posi-tion.

Clearance between throttle stop screw and throt-

tle lever at full close position.

There should beno clearance.

THROTTLE LEVER

THROTTLELEVER

THROTTLE STOPSCREW(Non-adjustable)

Replace the throttle body if there is excessive play in thethrottle valve shaft or if the shaft is binding or sticking.

http://tl9598a11002a.pdf/http://tl9598a11135a.pdf/http://tl9598a11135a.pdf/http://tl9598a11135a.pdf/http://tl9598a11002a.pdf/http://tl9598a11135a.pdf/


43/200

Disassembly

with TCS: Remove the TCS control valve (seesection 19).

CRUISE CONTROL CABLE

CAUTION:

The throttle stop screw is non-adjustable.

After reassembly, adjust the throttle cable (see page11-135)and the cruise control cable (seesection 23).

TPSENSOR

O-RING

IDLE ADJUSTINGSCREW

THROTTLECABLE


GASKETReplace.

http://tl959819index.pdf/http://tl959819index.pdf/http://tl959819index.pdf/http://tl9598a11135a.pdf/http://tl9598a11135a.pdf/http://tl9598a11135a.pdf/http://tl959823indxb.pdf/http://tl959823indxb.pdf/http://tl959823indxb.pdf/http://tl959819index.pdf/http://tl9598a11135a.pdf/


44/200

Intake Air System

Intake Air Bypass (IAB) Control System

Description

Satisfactory power performance is achieved by closing and opening the intake air bypass (IAB) control valves. High torque

at low rpm is achieved when the valves are closed, whereas high power at high rpm is achieved when the valves areopened.

INTAKE AIR BYPASS (IAB) LOW

CONTROL SOLENOID VALVE OFF

ENGINE SPEED IS ABOVE 3,350 rpm

INTAKE AIR BYPASS (IAB) HIGH

CONTROL SOLENOID VALVE OFF

ENGINE SPEED IS ABOVE 3,950 rpm

IABCONTROL

LOW VALVE : CLOSED

IABCONTROL

HIGH VALVE: CLOSED

IAB CONTROL

HIGH VALVE

IAB CONTROL

HIGH DIAPHRAGM VALVE

IA B

CONTROL

LOW VALVE IABCONTROLLOW

DIAPHRAGM VALVE

IABCONTROL

LOWVALVE : OPEN

IAB

CONTROL

HIGH VALVE: CLOSED

IAB CONTROL

LOW VALVE: OPEN

IAB CONTROL

HIGH VALVE: OPEN



45/200


Inspection of IAB Control Sys-tem.

No. 2 VACUUMHOSE

Check for vacuum at idle:

1. Start engine and allow it toidle.

2. Remove No. 2 vacuum hose

from the IAB low control dia-phragm valve and connect vacu-

um gauge to the hose.

VACUUM PUMP/

GAUGE

A973X - 041 -XXXXX

Is there vacuum?

Check for vacuum at IAB vacuum

tank:Disconnect the No. 4 vacuum

hose on IAB low control solenoid

valve and connect a vacuum

gauge to the hose.

IAB LOWCONTROL

DIAPHRAGMVALVE

Is there vacuum?

Repair the blockage or vacuumleak between the IAB vacuumtank and the intake manifold.

Check for an open in the wire

(IABCS1 line):1. Turn the ignition switch OFF.2. Disconnect the 4P connector

from the IAB control solenoid

valve assy.3. Start engine and allow it to

idle.

4. Measure voltage between 4P

connector terminal No. 2 and

No. 4.

IAB CONTROL SOLENOID VALVE

ASSY. 4P CONNECTOR (C203)


Is there battery voltage?Replace the IAB low control sole-

noid valve.

Check for an open in the wire (IG1

line):

Measure voltage between 4P con-

nector terminal No. 2 and bodyground.

(To page 11-140) (To page11-140)



46/200

Intake Air System

Intake Air Bypass (IAB) Control System (cont'd)

(From page11-139)

Check for vacuum at idle:Remove No. 8 vacuum hose fromthe IAB high control diaphragmvalve and connect a vacuum gaugeto the hose.

Is there vacuum?

(To page11-141)

(From page11-139)


Check for an open in the wire(IABCS1 line):

1. Turn the ignition switch OFF.2. Check for continuity betweenPCM connector terminal A20and 4P connector terminalNo. 4.


Substitute a known-good PCM

and recheck. If symptom goesaway, replace the original PCM.

Check for vacuum at IAB vacuumtank:Disconnect the No. 4 vacuumhose on IAB low control solenoidvalve and connect a vacuumgauge to the hose.

Is there vacuum?

Check for an open in the wire(IABCS2 line):1. Turn the ignition switch OFF.2. Disconnect the 4P connector

from the IAB control solenoidvalve assy.

3. Start engine and allow it toidle.

4. Measure voltage between 4P

connector terminal No. 1 andNo. 3.

(To page11-141)

Repair open in wire between the4P connector and No. 4 ECU(PCM) (15 A) fuse in the under-dash fuse/relay box.


IAB CONTROL

SOLENOID VALVEASSY. 4PCONNECTOR (C203)

Wire side offemaleterminals


No. 8 VACUUM HOSE IAB HIGHCONTROLDIAPHRAGMVALVE

VACUUMPUMP/GAUGEA973X - 041 -XXXXX

Repair the blockage or vacuumleak between the IAB vacuumtank and the intake manifold.




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(From page11-140) (From page11-140)


Check for an open in the wire (IG1line):Measure voltage between 4P con-nector terminal No. 1 and bodyground.


Check for an open in the wire(IABCS2 line):1. Turn the ignition switch OFF.

2. Check for continuity betweenPCM connector terminal A22and 4P connector terminalNo. 3.


Check the IAB Low Control Sole-noid Valve:Disconnect the 4P connector from

the IAB control solenoid valveassembly.

Replace the IAB high controlsolenoid valve.

IAB CONTROL SOLENOID VALVEASSY. 4P CONNECTOR (C203)

Wire side of female

terminals

Repair open in wire between the4P connector and No. 4 ECU(PCM) (15 A) or (20A) fuse in theunder-dash fuse/relay box.



Is there vacuum?Replace the IAB low control sole-noid valve.

(To page11-142) (To page11-142)

Substitute a known-good PCMand recheck. If symptom goesaway, replace the original PCM.

Is there vacuum?

Check for vacuum at 3,400 rpm:1. Raise engine speed to 3,400

rpm.2. Check for vacuum at No. 2

vacuum hose.



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Intake Air System

Intake Air Bypass (IAB) Control System (cont'd)

(From page11-141) (From page11-141)


Check for vacuum at 4,000 rpm:1. Raise engine speed to 4,000

rpm.

2. Check for vacuum at No. 8vacuum hose.

Check for a short in the wire(IABCS1 line):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor A (26P) from the PCM.3. Check for continuity between

PCM connector terminal A20

and body ground.



Is there continuity to ground?



Repair short to ground at wirebetween PCM (A20) and the 4Pconnector.

Replace the IAB high control sole-noid valve.

Repair short to ground at wirebetween PCM (A22) and the 4Pconnector.

Check for a short in the wire(IABCS2 line):1. Turn the ignition switch OFF.2. Disconnect the PCM connec-

tor A (26P) form the PCM.3. Check for continuity between

PCM connector terminal A22and body ground.

IAB control system is OK.

Is there vacuum?

Is there vacuum?

Check the IAB high Control Sole-noid Valve:Disconnect the 4P connector from

the IAB control solenoid valveassembly.



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Testing

Intake Air Bypass (IAB) Low Control Valve

1. Disconnect the No. 2 vacuum hose from the vacu-um hose manifold, and attach a vacuum pump to the

vacuum hose manifold.

IAB LOW

CONTROL SOLENOID VALVE

No. 2 VACUUM HOSE

2.

VACUUM PUMP/

GAUGE

A973X - 041 - XXXXX

Apply vacuum and verify that the IAB control dia-

phragm valve holds vacuum and that as the vacuum

is applied and released the IAB control diaphragm

valve rod moves in and out.

If the IAB control diaphragm valve does not hold

vacuum or the IAB control diaphragm valve rod

does not move in and out, replace the IAB con-

trol valve and retest.

Intake Air Bypass (IAB) High Control Valve

1.Disconnect the No. 8 vacuum hose from the vacu-um hose manifold, and attach a vacuum pump to

the vacuum hose manifold.

IAB HIGHCONTROL SOLENOID VALVE

No. 8 VACUUM HOSE

2. Apply vacuum and verify that the IAB control

diaphragm valve holds vacuum and that as the vac-

uum is applied and released the IAB control dia-

phragm valve rod moves in and out.

If the IAB control diaphragm valve does not hold

vacuum or the IAB control diaphragm valve rod

does not move in and out, replace the IAB con-

trol valve and retest.

http://tl9598a11002a.pdf/http://tl9598a11002a.pdf/


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Emission Control System

Three Way Catalytic Converter (TWC)

Description

The Three Way Catalytic Converter (TWC) is used to convert hydrocarbons (HC), carbon monoxide (CO), and oxides of

nitrogen (NOx) in the exhaust gas to carbon dioxide (CO2), dinitrogen (N2) and water vapor.

SECONDARY HEATED OXYGEN SENSOR (SENSOR 2)

HOUSING

THREE WAYCATALYSTS FRONT OF

VEHICLE



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Exhaust Gas Recirculation (EGR) System

DescriptionThe EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR

valve and the intake manifold into the combustion chambers. It is composed of the EGR valve, EGR vacuum control valve,EGR control solenoid valve, PCM and various sensors.

The PCM contains memories for ideal EGR valve lifts for varying operating conditions. The EGR valve lift sensor detects

the amount of EGR valve lift and sends the information to the PCM. The PCM then compares it with the ideal EGR valve lift

which is determined by signals sent from the other sensors. If there is any difference between the two, the PCM cuts cur-

rent to the EGR control solenoid valve to reduce vacuum applied to the EGR valve.

EGR VALVELIFT SENSOR

INTAKEMANIFOLD

From No. 4 ECU (PCM)FUSE (15 A) or (20 A)(in the under-dashfuse/relay box)

EGR

CONTROLSOLENOIDVALVE EGR

VACUUMCONTROLVALVE

VARIOUSSENSORS

EGR VAL VE



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Positive Crankcase Ventilation (PCV) System

Description

The Positive Crankcase Ventilation (PCV) system is

designed to prevent blow-by gas from escaping to the

atmosphere. The PCV valve contains a spring-loaded

plunger. When the engine starts, the plunger in the PCV

valve is lifted in proportion to intake manifold vacuum and

the blow-by gas is drawn directly into the intake manifold.

INTAKE

MANIFOLDBREATHER PIPE

PCV HOSE

PCV VALVE

BLOW-BY VAPOR

FRESH AIR

Inspection

1. Check the PCV hoses and connections for leaks and

clogging.

PCV HOSE

BREATHER

PIPE

PCV VALVE

2. At idle, make sure there is a clicking sound from thePCV valve when the hose between the PCV valve

and intake manifold is lightly pinched with your fin-

gers or pliers.

Gently pinch here

If there is no clicking sound, check the PCV valve

grommet for cracks or damage. If the grommet is

OK, replace the PCV valve and recheck.



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Evaporative Emission (EVAP) Controls

Description

The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The

system consists of the following components:

A. Evaporative Emission (EVAP) Control Canister

An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from the

EVAP control canister into the engine and burned.

B. Vapor Purge Control System

EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a port

on the throttle body. The purging vacuum is controlled by the EVAP purge control solenoid valve.

'96 model: '97 - 98 models:

C. Fuel Tank Vapor Control System

When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and

regulates the flow of fuel vapor to the EVAP control canister.

'96 model:

INTAKE MANIFOLD

THROTTLE

BODY

EVAP P URGECONTROLSOLENOID VALVE

FUEL TANKEVAP VALVE

EVAP TWO WAY VALVE

FromNo. 4 ECU (PCM) (15A)

FUSE (in the under-dashfuse/relay box)

EVAPCONTROLCANISTER FRESH

AIR

EVAP PURGEFLOW SWITCH

FUEL FILL C AP

PCMVARIOUSSENSORS

FUEL TANK

ENGINE COOLANT TEMPERATURE ABOVE 158F (70C) ENGINE COOLANT TEMPERATURE ABOVE 99F (37C)

EVAP PURGE CONTROL SOLENOID VALVE DUTY CON-

TROLLED AFTER STARTING ENGINE

EVAP PURGE CONTROL SOLENOID VALVE OFF AFTER

STARTING ENGINE



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Evaporative Emission (EVAP) Controls (cont'd)

'97 - 98 models:

INTAKEMANIFOLD

THROTTLEBODY

FromNo. 4 ECU(PCM)(20 A) FUSE(in the under-dashfuse/relay box)

EVAP CONTROL CANISTERVENT SHUT VALVE

EVAP TWO WAY VALVE

EVAPCONTROLCANISTER

VARIOUSSENSORS

EVAPBYPAS SSOLENOID VALV E

FUEL TANK

FUEL TANKPRESSURESENSOR

FUEL TANKEVAP VALVE

FUEL FILL CAP

PCM

EVAP PURGECONTROLSOLENOID VALVE

EVAP THREEWAY VALVE



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Evaporative Emission (EVAP) Control Canister and EVAP

Control Canister Vent Shut Valve Replacement

1. Remove the front bumper (seesection 20).

2. Remove the EVAP control canister.

EVAP

CONTROL CANISTER

COVER

3. Remove the EVAP control canister vent shut valve.

EVAP

CONTROL

CANISTER

VENTSHUTVALVE

O-RINGReplace.

Evaporative Emission (EVAP) Two Way Valve and EVAP

Bypass Solenoid Valve Replacement

O-RINGReplace.

http://tl959820index.pdf/http://tl959820index.pdf/http://tl959820index.pdf/http://tl959820index.pdf/


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Special Tools

14-176,14-194

14-185,14-188

14-143

14-128

14-197

14-185, 14-188

14-143

14-168,14-169,14-192

14-213

14-114, 14-118

14-114,14-118

14-65

14-66,14-108

14-114,14-118

14-114,14-118

14-198,14-199

14-176,14-191

14-198, 14-199

14-193,14-197,14-198

14-207

14-191,14-193,14-194

14-197,14-198,14-199

14-141,14-208

14-198

http://tl9598a14176a.pdf/http://tl9598a14176a.pdf/http://tl9598a14193a.pdf/http://tl9598a14193a.pdf/http://tl9598a14185a.pdf/http://tl9598a14185a.pdf/http://tl9598a14187a.pdf/http://tl9598a14187a.pdf/http://tl9598a14142a.pdf/http://tl9598a14126a.pdf/http://tl9598a14197a.pdf/http://tl9598a14185a.pdf/http://tl9598a14185a.pdf/http://tl9598a14187a.pdf/http://tl9598a14142a.pdf/http://tl9598a14168b.pdf/http://tl9598a14168b.pdf/http://tl9598a14168b.pdf/http://tl9598a14168b.pdf/http://tl9598a14192a.pdf/http://tl9598a14211a.pdf/http://tl9598a14114a.pdf/http://tl9598a14114a.pdf/http://tl9598a14118a.pdf/http://tl9598a14114a.pdf/http://tl9598a14114a.pdf/http://tl9598a14118a.pdf/http://tl9598a14064a.pdf/http://tl9598a14064a.pdf/http://tl9598a14064a.pdf/http://tl9598a14108a.pdf/http://tl9598a14114a.pdf/http://tl9598a14114a.pdf/http://tl9598a14118a.pdf/http://tl9598a14114a.pdf/http://tl9598a14114a.pdf/http://tl9598a14118a.pdf/http://tl9598a14198a.pdf/http://tl9598a14198a.pdf/http://tl9598a14199a.pdf/http://tl9598a14199a.pdf/http://tl9598a14176a.pdf/http://tl9598a14176a.pdf/http://tl9598a14191a.pdf/http://tl9598a14198a.pdf/http://tl9598a14198a.pdf/http://tl9598a14199a.pdf/http://tl9598a14193a.pdf/http://tl9598a14193a.pdf/http://tl9598a14197a.pdf/http://tl9598a14197a.pdf/http://tl9598a14198a.pdf/http://tl9598a14204a.pdf/http://tl9598a14191a.pdf/http://tl9598a14191a.pdf/http://tl9598a14193a.pdf/http://tl9598a14193a.pdf/http://tl9598a14193a.pdf/http://tl9598a14193a.pdf/http://tl9598a14197a.pdf/http://tl9598a14197a.pdf/http://tl9598a14198a.pdf/http://tl9598a14198a.pdf/http://tl9598a14198a.pdf/http://tl9598a14199a.pdf/http://tl9598a14140a.pdf/http://tl9598a14140a.pdf/http://tl9598a14204a.pdf/http://tl9598a14204a.pdf/http://tl9598a14198a.pdf/http://tl9598a14197a.pdf/http://tl9598a14198a.pdf/http://tl9598a14204a.pdf/http://tl9598a14140a.pdf/http://tl9598a14199a.pdf/http://tl9598a14198a.pdf/http://tl9598a14197a.pdf/http://tl9598a14193a.pdf/http://tl9598a14193a.pdf/http://tl9598a14191a.pdf/http://tl9598a14204a.pdf/http://tl9598a14198a.pdf/http://tl9598a14193a.pdf/http://tl9598a14199a.pdf/http://tl9598a14198a.pdf/http://tl9598a14191a.pdf/http://tl9598a14176a.pdf/http://tl9598a14199a.pdf/http://tl9598a14198a.pdf/http://tl9598a14118a.pdf/http://tl9598a14114a.pdf/http://tl9598a14118a.pdf/http://tl9598a14114a.pdf/http://tl9598a14108a.pdf/http://tl9598a14064a.pdf/http://tl9598a14064a.pdf/http://tl9598a14118a.pdf/http://tl9598a14114a.pdf/http://tl9598a14118a.pdf/http://tl9598a14114a.pdf/http://tl9598a14211a.pdf/http://tl9598a14192a.pdf/http://tl9598a14168b.pdf/http://tl9598a14168b.pdf/http://tl9598a14142a.pdf/http://tl9598a14187a.pdf/http://tl9598a14185a.pdf/http://tl9598a14197a.pdf/http://tl9598a14126a.pdf/http://tl9598a14142a.pdf/http://tl9598a14187a.pdf/http://tl9598a14185a.pdf/http://tl9598a14193a.pdf/http://tl9598a14176a.pdf/


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Description

The automatic transmission is a combination of a 3-element torque converter and a dual-shaft electronically controlled

automatic transmission which provides 4 speeds forward and 1 reverse. The entire unit is positioned in line with the engine.

Torque Converter, Gears and Clutches

The torque converter consists of a pump, turbine, and stator, assembled in a single unit. They are connected to the engine

crankshaft so they turn together as a unit as the engine turns. Around the outside of the drive plate is a ring gear whichmeshes with the starter pinion when the engine is being started.

The entire torque converter assembly serves as a flywheel while transmitting power to the transmission mainshaft.

The transmission has two parallel shafts: the mainshaft and the countershaft. The mainshaft is in line with the engine

crankshaft. The mainshaft includes the 1st, 4th and 2nd clutches and gears for 4th, 1st, 2nd and reverse (3rd gear is integral

with the mainshaft). The countershaft includes the 3rd, 1st-hold and reverse clutches, and gears for 3rd, 4th, 1st, 2nd,

reverse and parking. The secondary drive gear is integrated with the countershaft. The gears on the mainshaft are in con-

stant mesh with those on the countershaft. When certain combinations of gears in the transmission are engaged by clutch-

positions.andes, power is transmitted from the mainshaft to the countershaft to provide

Electronic ControlThe electronic control system consists of a Powertrain Control Module (PCM), sensors, a linear solenoid and four solenoid

valves. Shifting and lock-up are electronically controlled for comfortable driving under all conditions.

The PCM is located below the dashboard, under the front lower panel on the passenger's side.

Hydraulic Control

The lower valve body assembly includes the main valve body, the secondary valve body, the throttle valve body, the lin-

ear solenoid, the shift control solenoid valves and the ATF passage body. They are bolted on the lower part of the trans-

mission housing. The regulator valve body, the ATF pump body, and the accumulator body are bolted to the torque con-

verter housing.

The main valve body on '96 model contains the manual valve, the 1-2 shift valve, the 2-3 shift valve, the 3-4shift valve, the

4-3kick-down valve and the Clutch Pressure Control (CPC) valve. The main valve body on '97 model contains the manual

valve, the 1-2shift valve, the 2-3 shift valve, the 3-4 shift valve, the 4-3kick-down valve and the main orifice control valve.

The secondary valve body on '96 model contains the3-4 orifice control valve, the 4-3shift timing valve, the modulator valve

and the accumulator pistons.The secondary valve body on '97 model contains the3-4 orifice control valve, the 4-3 shift tim-

ing valve, the line pressure control valve, the modulator valve and the accumulator pistons. The throttle valve bodyincludes the throttle valve which is bolted onto the secondary valve body. The linear solenoid is joined to the throttle valve

body. The regulator valve body contains the regulator valve, the lock-up shift valve and the cooler relief valve. Fluid from

the regulator passes through the manual valve to the various control valves. The ATF pump body contains the lock-up tim-

ing valve, the lock-up control valve and the relief valve. The torque converter check valve is located in the torque converter

housing under the ATF pump body. The accumulator body contains the accumulator pistons. The reverse accumulator and

the 1st-hold accumulator pistons are assembled in the rear cover.

The 1st, 1st-hold, 2nd and reverse clutches receive fluid from their respective feed pipes, and the 3rd and 4th clutches

receive fluid from the internal hydraulic circuit.

Shift Control Mechanism

Input from various sensors located throughout the vehicle determines which shift control solenoid valve the PCM will acti-

vate. Activating a shift control solenoid valve changes modulator pressure, causing a shift valve to move. This pressurizes a

line to one of the clutches, engaging the clutch and its corresponding gear.

er through a fluid passage, causing the lock-up piston to be held against the torque converter cover. As this takes place, the

mainshaft rotates at the same speed as the engine crankshaft. Together with hydraulic control, the PCM optimizes the tim-

ing of the lock-up mechanism. The lock-up valves control the range of lock-up according to lock-up control solenoid valvesA and B, and throttle valve. When lock-up control solenoid valves A and B activate, modulator pressure changes. The lock-up control solenoid valves A and B are mounted on the torque converter housing, and are controlled by the PCM.

(cont'd)

Lock-up Mechanism

In position, in 2nd, 3rd, and 4th, and position in 3rd, pressurized fluid is drained from the back of the torque convert-

http://tl9598a01002a.pdf/http://tl9598a03004a.pdf/http://tl9598a04002a.pdf/http://tl9598a01002a.pdf/http://tl9598a03004a.pdf/http://tl9598a04002a.pdf/http://tl9598a03004a.pdf/http://tl9598a04002a.pdf/http://tl9598a03004a.pdf/http://tl9598a04002a.pdf/http://tl9598a04002a.pdf/http://tl9598a03004a.pdf/http://tl9598a04002a.pdf/http://tl9598a03004a.pdf/http://tl9598a04002a.pdf/http://tl9598a03004a.pdf/http://tl9598a01002a.pdf/http://tl9598a04002a.pdf/http://tl9598a03004a.pdf/http://tl9598a01002a.pdf/


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Description

(cont'd)

Front wheels locked; parking brake pawl engaged with parking gear on countershaft. All clutches

released.

Reverse; reverse clutch engaged.

All clutches released.

Automatic Transaxle (A/T) Gear Position Indicator

The A/T gear position indicator in the instrument panel shows which gear has been selected without having to look down

at the console.

positions through the use of a slide-type, neutral-safety switch.Starting is possible only in and

Gear Selection

The shift lever has seven positions:

3rd gear ranges. 1st gear.2nd gear and

PARK, REVERSE, NEUTRAL, 1st through 4th gear ranges. 1st through

For rapid acceleration at highway speeds and general driving; up-hill and down-hill driving; starts off

in 1st, shifts automatically to 2nd, then 3rd, depending on vehicle speed and throttle position.

Downshifts through 2nd to1ston deceleration to stop. The lock-up mechanism comes into operation

in 3rd speed.

For engine braking or better traction starting off on loose or slippery surfaces; stays in 2nd gear,

does not shift up or down.

For engine braking; stays in 1st gear, does not shift up.

General driving; starts off in 1st, shifts automatically to 2nd, 3rd, then 4th, depending on vehicle

speed and throttle position. Downshifts through 3rd, 2nd and 1st on deceleration to stop. The lock-

up mechanism comes into operation in position in 2nd, 3rd and 4th gear.



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ATF DIPSTICK

RING GEAR

TORQUECONVERTER

4TH CLUTCH

1ST CLUTCH

2ND CLUTCH

MAINSHAFT

COUNTERSHAFT

EXTENSIONSHAFT

SECONDARYDRIVEN GEAR

3RD CLUTCH

REVERSE

CLUTCH1ST-HOLDCLUTCH

DIFFERENTIALASSEMBLY

NOTE: The illustration shows '96 model; '97 - '98 models are similar.



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Description

Clutches

The four-speed automatic transmission uses hydraulically-actuated clutches to engage or disengage the transmission gears.

When the hydraulic pressure is introduced into the clutch drum, the clutch piston moves. This presses the friction discs

and steel plates together, locking them so they don't slip. Power is then transmitted through the engaged clutch pack to itshub-mounted gear.

Likewise, when the hydraulic pressure is bled from the clutch pack, the piston releases the friction discs and steel plates, and

they are free to slide past each. This allows the gear to spin independently of its shaft, transmitting no power.

1st Clutch

The 1st clutch, engages/disengages 1st gear, and is located at the middle of the mainshaft. The 1st clutch is joined back-to-

back to the 4th clutch. The 1st clutch is supplied hydraulic pressure by its ATF feed pipe within the mainshaft.

shaft. The 1st-hold clutch is supplied hydraulic pressure by its ATF feed pipe within the countershaft.

1st-hold Clutch

The 1st-hold clutch engages/disengages 1st-hold, position or position, and is located at the middle of the counter-

2nd Clutch

The 2nd clutch engages/disengages 2nd gear, and is located on the rear end of the mainshaft. The 2nd clutch is supplied

hydraulic pressure by its ATF feed pipe within the mainshaft.

3rd Clutch

The 3rd clutch engages/disengages 3rd gear, and is located at the end of the countershaft, opposite the rear cover. The

3rd clutch is supplied hydraulic pressure by a circuit connected to the internal hydraulic circuit.

4th Clutch

The 4th clutch engages/disengages 4th gear, and is located at the middle of the mainshaft. The 4th clutch is joined back-

to-back to the 1st clutch. The 4th clutch is supplied hydraulic pressure by a circuit connected to the internal hydraulic cir-

cuit.

Reverse Clutch

The reverse clutch engages/disengages reverse gear, and is located on the rear end of the countershaft. The reverse clutch is

supplied hydraulic pressure by its ATF feed pipe within the countershaft.

One-way Clutch

This transmission has two one-way clutches: the 1st gear one-way clutch and the 2nd gear one-way clutch. The 1st gear

one-way clutch is positioned between the countershaft 1st gear and the one-way clutch hub, with the one-way clutch hub

splined to the countershaft 2nd gear. The countershaft 1st gear provides the outer race surface, and the one-way clutch

hub provides the inner race surface. The 2nd gear one-way clutch is positioned between the countershaft 2nd gear and

the parking gear, with the parking gear splined to the countershaft. The countershaft 2nd gear provides the outer race sur-

face, and the parking gear provides the inner race surface. The one-way clutches lock up when power is transmitted fromthe mainshaft 1st gear to the countershaft 1st gear. The 2nd gear one-way clutch locks up when power is transmitted from

the mainshaft 2nd gear to the countershaft 2nd gear.

The 1st clutch and gears remain engaged in the 1st, 2nd, 3rd, and 4th gear positions in the

the 1st gear one-way clutch disengages when the 2nd, 3rd, or 4th clutches/gears are applied in the

The sprags engage/

disengage outsideand inside of theone-way clutch.

is because the increased rotational speed of the gears on the countershaft over-ride the locking "speed range" of the one-

way clutch. Thereafter, the one-way clutch freewheels with the 1st clutch still engaged.

INSIDE OF ONE-WAY

CLUTCH

Splined with counter-shaft

OUTSIDE OF ONE-WAY

CLUTCH

position. However,or

or position. This



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MAINSHAFT 3RD

GEAR

MAINSHAFT 4TH

GEAR

4TH CLUTCH

1ST CLUTCH

MAINSHAFT 1STGEAR

MAINSHAFT 2ND

GEAR

2ND CLUTCH

MAINSHAFT REVERSEGEAR

DIFFERENTIAL

EXTENSION SHAFT

SECONDARY DRIVEGEAR

3RD CLUTCH

SECONDARY DRIVEN GEAR

COUNTERSHAFT 3RDGEAR

COUNTERSHAFT 4THGEAR

1ST-HOLD CLUTCH

1ST-GEAR ONE-WAYCLUTCH

COUNTERSHAFT 1ST GEAR

ONE-WAY CLUTCH HUB

COUNTERSHAFT

Acura 2.5TL 3.2TL (1995 -1998 ) Service Manual_Part2

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Transcript of Acura 2.5TL 3.2TL (1995 -1998 ) Service Manual_Part2