Infiniti QX4 (R50). Manual — part 576

Diagnostic Procedure

NBTF0021

1

CHECK 2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH

Refer to “2-4WD Shift Solenoid Valve and Transfer Fluid Temperature Sensor”, “COMPONENT INSPECTION”, TF-111.

SMT778D

OK or NG

OK

©

GO TO 2.

NG

©

Check the following. If OK, repair or replace 2-4WD shift solenoid valve and 4WD
shift switch.

I

Continuity of transfer sub-harness
Refer to “TRANSFER TERMINAL CORD ASSEMBLY SUB-HARNESS CONNECTOR”,
“COMPONENT INSPECTION”, TF-114.

2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH

Diagnostic Procedure

TF-66

2

CHECK INPUT SIGNAL

With CONSULT-II

1. Select “ECU INPUT SIGNALS” in Data Monitor.
2. Read out ON/OFF status of “2WD SW” and “LOCK SWITCH”.

SMT974D

OK or NG

OK

©

1. Perform transfer control unit input/output signal inspection. Refer to “TRANSFER

CONTROL UNIT INSPECTION TABLE”, “TROUBLE DIAGNOSIS — GENERAL
DESCRIPTION”, TF-55.

2. If NG, recheck transfer control unit pin terminals for damage or loose connection with

harness connector.

NG

©

GO TO 3.

GI

MA

EM

LC

EC

FE

AT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH

Diagnostic Procedure (Cont’d)

TF-67

3

CHECK 4WD SHIFT SWITCH POWER SOURCE

1. Disconnect 4WD shift switch harness connector.
2. Turn ignition switch to “ON” position.
3. Check voltage between 4WD shift switch harness connector terminal 1 and body ground.

Voltage: Battery voltage

SMT852D

OK or NG

OK

©

GO TO 4.

NG

©

Check the following.

I

No. 18 fuse (10A)

I

Continuity between ignition switch and 4WD shift switch

2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH

Diagnostic Procedure (Cont’d)

TF-68

4

CHECK HARNESS CONTINUITY

1. Turn ignition switch to “OFF” position.
2. Check continuity between the following terminals:

I

Transfer control unit 9 and 4WD shift switch 2 (2WD)

I

Transfer control unit 18 and 4WD shift switch 5 (4H)

I

Transfer control unit 24 and 4WD shift switch 3 (AUTO)

I

Transfer control unit 23 and 4WD shift switch 6 (4LO)

I

Transfer control unit 1 and Transfer terminal cord assembly sub-harness connector 4

I

4WD shift switch 4 and Transfer terminal cord assembly sub-harness connector 5
Continuity should exist.

SMT853D

OK or NG

OK

©

GO TO 5.

NG

©

Repair harness or connector.

5

PERFORM SELF-DIAGNOSIS AGAIN

After driving for a while, perform self-diagnosis again.
Refer to “Trouble Diagnosis without CONSULT-II”, TF-27.

OK or NG

OK

©

INSPECTION END

NG

©

1. Perform transfer control unit input/output signal inspection. Refer to “TRANSFER

CONTROL UNIT INSPECTION TABLE”, “TROUBLE DIAGNOSIS — GENERAL
DESCRIPTION”, TF-55.

2. If NG, recheck transfer control unit pin terminals for damage or loose connection with

harness connector.

GI

MA

EM

LC

EC

FE

AT

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH

Diagnostic Procedure (Cont’d)

TF-69