Infiniti QX4 (R50). Manual — part 584
Symptom 1. 4WD Shift Indicator Lamp Does
Not Turn ON
NBTF0029
SYMPTOM: Although ignition switch is turned “ON”, all the
4WD shift indicator lamps do not turn ON for 1 second.
1
CHECK TRANSFER CONTROL UNIT POWER SOURCE
SMT958D
SMT860D
1. Turn ignition switch to “OFF” position and disconnect transfer control unit harness connector.
2. Turn ignition switch to “ON” position. (Do not start engine.)
3. Check voltage between transfer control unit harness connector terminals 16, 22 and body ground.
Voltage: Battery voltage
SMT796D
OK or NG
OK
©
GO TO 2.
NG
©
Check the following.
I
Continuity between ignition switch and transfer control unit
I
Ignition switch and No. 18 fuse (10A)
TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 1. 4WD Shift Indicator Lamp Does Not Turn ON
TF-98
2
CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect transfer control unit harness connector.
3. Measure resistance between transfer control unit harness connector terminals 6, 45 and body ground.
Resistance: 0
Ω
SMT797D
OK or NG
OK
©
GO TO 3.
NG
©
Check continuity between transfer control unit and body ground.
3
CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.
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
TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 1. 4WD Shift Indicator Lamp Does Not Turn ON (Cont’d)
TF-99
Symptom 2. 4WD Warning Lamp Does Not Turn
ON
=NBTF0030
SYMPTOM: Although ignition switch is turned “ON”, 4WD
warning lamp does not turn ON.
1
CHECK TRANSFER CONTROL UNIT POWER SOURCE
SMT799D
1. Turn ignition switch to “OFF” position and disconnect transfer control unit harness connector.
2. Turn ignition switch to “ON” position.
(Do not start engine.)
3. Check voltage between transfer control unit harness connector terminals 16, 22 and body ground.
Voltage: Battery voltage
SMT800D
OK or NG
OK
©
GO TO 2.
NG
©
Check the following.
I
Continuity between ignition switch and transfer control unit
I
Ignition switch and No. 18 fuse (10A)
TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 2. 4WD Warning Lamp Does Not Turn ON
TF-100
2
CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect transfer control unit harness connector.
3. Measure resistance between transfer control unit harness connector terminals 6, 45 and body ground.
Resistance: 0
Ω
SMT803D
OK or NG
OK
©
GO TO 3.
NG
©
Check continuity between transfer control unit and body ground.
3
CHECK 4WD WARNING LAMP CIRCUIT
Check the following.
I
4WD warning lamp
I
Continuity between ignition switch and 4WD warning lamp
I
Continuity between 4WD warning lamp and transfer control unit
OK or NG
OK
©
GO TO 4.
NG
©
I
Repair or replace harness or connector.
I
Replace 4WD warning lamp.
4
CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.
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
TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 2. 4WD Warning Lamp Does Not Turn ON (Cont’d)
TF-101
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