Nissan TB45E Engine Control.pdf

ENGINE CONTROL SYSTEM

SECTIONECMODIFICATION NOTICE:The wiring diagram for IACV-FICD solenoid valve on models with the TB45E engine has been changed.

CONTENTSPRECAUTIONS ...............................................................2

Supplemental Restraint System (SRS) ″AIRBAG″ and ″SEAT BELT PRE-TENSIONER″...............2

TB45E

ENGINE AND EMISSION CONTROL OVERALLSYSTEM...........................................................................3

Circuit Diagram............................................................3TROUBLE DIAGNOSIS FOR NON-DETECTABLEITEMS...............................................................................4

IACV-FICD Solenoid Valve ..........................................4

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Supplemental Restraint System (SRS) “AIRBAG” and “SEAT BELT PRE-TENSIONER”

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” used along witha seat belt, helps to reduce the risk or severity of injury to the driver and front passenger in a frontal collision.The SRS system composition which is available to NISSAN MODEL Y61 is as follows (The composition var-ies according to the destination.):Driver air bag module (located in the center of the steering wheel), front passenger air bag module (locatedon the instrument panel on passenger side), seat belt pre-tensioner, a diagnosis sensor unit, warning lamp,wiring harness and spiral cable.Information necessary to service the system safely is included in the RS section of this Service Manual.WARNING:I To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death

in the event of a collision which would result in air bag inflation, all maintenance must be performedby an authorized NISSAN dealer.

I Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and AirBag Module, see the RS section.

I Do not use electrical test equipment on any circuit related to the SRS unless instructed to in thisService Manual. Spiral cable and wiring harnesses covered with yellow insulation either just beforethe harness connectors or for the complete harness are related to the SRS.

PRECAUTIONS

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Circuit Diagram

TEC673

ENGINE AND EMISSION CONTROL OVERALL SYSTEM TB45E

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IACV-FICD Solenoid Valve

TEC674

TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS TB45E

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DIAGNOSTIC PROCEDURE

For the Middle East with rear cooler

INSPECTION START

CHECK OVERALL FUNCTION.1. Start engine and warm it up to normal

operating temperature.2. Check idle speed.

650±50 rpmIf NG, adjust idle speed.

3. Turn air conditioner switch and blowerfan switch “ON”.

4. Recheck idle speed.950 rpm or more (LHD models)

NG

EOK INSPECTION END

Check if air conditioner compressor func-tions normally.

OK

ENG Refer to HA section.

CHECK POWER SUPPLY.1. Stop engine.2. Disconnect IACV-FICD solenoid valve

harness connector.3. Restart engine and turn air conditioner

switch and blower fan switch “ON”.4. Check voltage between terminal q2 and

ground with CONSULT or tester.Voltage: Battery voltage

OK

ENG Check the following.

I Harness connectorsM50 , F5

I Harness connectorsE104 , M86 (LHD mod-

els)I Harness for open or

short between IACV-FICD solenoid valve andair conditioner relay

If NG, repair harness orconnectors.With front

auto A/CE qA

(Go to next page.)

With frontmanual A/C

CHECK GROUND CIRCUIT.1. Turn ignition switch “OFF”.2. Check harness continuity between ter-

minal q1 and body ground.Continuity should exist.If OK, check harness for short toground and short to power.

NOTE:Specifications may vary depending onthe type of tester.

OK


I Diode F28

I Harness connectorsF5 , M50 , M21 , E127

I Ambient air temperatureswitch (Refer to HA sec-tion.)

I Harness for open orshort between IACV-FICD solenoid valve andground E40 , E25

If NG, repair open circuit,short to ground or short topower in harness or con-nectors.

qB

(Go to next page.)

MEF634E

SEF617V

SEF777W

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IACV-FICD Solenoid Valve (Cont’d)

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qA

CHECK GROUND CIRCIT.1. Turn ignition switch “OFF”.2. Disconnect A/C auto amp. harness con-

nectors.3. Check harness continuity between

IACV-FICD harness connector terminalq1 and A/C auto amp. harness connec-tor terminal q27 .Continuity should exist.

If OK, check harness for short to groundand short to power.NOTE:Specifications may vary depending onthe type of tester.

OK


I Diode F28

I Harness connectorsF5 , M50

I Harness for open orshort between IACV-FICD solenoid valve andA/C auto amp.

If NG, repair open circuit,short to ground or short topower in harness or con-nectors.

CHECK A/C AUTO AMP.Refer to HA section.

OKF qB

CHECK COMPONENT(IACV-FICD solenoid valve).Refer to “COMPONENT INSPECTION”below.

OK

ENG Replace IACV-FICD sole-

noid valve.

Disconnect and reconnect harness con-nectors in the circuit. Then retest.

Trouble is not fixed.

Check ECM pin terminals for damage andcheck the connection of ECM harnessconnector. Reconnect ECM harness con-nector. Then retest.

INSPECTION END

COMPONENT INSPECTION

IACV-FICD solenoid valveDisconnect IACV-FICD solenoid valve harness connector.I Check for clicking sound when applying 12V direct current to

terminals.

SEF776W

SEF619V

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I Check plunger for seizing or sticking.I Check for broken spring.

SEF199S



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Nissan TB45E Engine Control.pdf

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