warning INFINITI QX4 2001 Factory Service Manual

2 CHECK 4WD WARNING LAMP
Is 4WD warning lamp turned ON?
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YesorNo
Ye s©1. Turn ignition switch to ªOFFº position.
2. Perform self-diagnosis.
Refer to ªTrouble Diagnosis without CONSULT-IIº, TF-27.
3. Go to ª2. CHECK AT IDLEº. Refer to TF-47.
No©Go to Symptom 2. Refer to TF-100.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
TF-46

2. CHECK AT IDLE=NBTF0017S03
1 CHECK 4WD SHIFT INDICATOR LAMP
1. Park vehicle on flat surface.
2. Turn ignition switch to ªOFFº position.
3. Move A/T selector lever to ªPº or ªNº position.
4. Set 4WD shift switch to ª4Hº position.
5. Set 4WD shift switch to ª2WDº position.
6. Start engine.
7. Is 4WD shift indicator lamp turned OFF?
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YesorNo
Ye s©Go to ªATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCHº. Refer
to TF-76.
No©GO TO 2.
2 CHECK 4WD WARNING LAMP
Is 4WD warning lamp turned OFF?
YesorNo
Ye s©GO TO 3.
No©Perform self-diagnosis. Refer to ªTrouble Diagnosis without CONSULT-IIº, TF-27.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
TF-47

3 CHECK 4WD SHIFT INDICATOR LAMP
1. Set 4WD shift switch to ª2WDº, ªAUTOº, ª4Hº, ª4LOº, ª4Hº and ª2WDº in order.
(Stay at each switch position for at least 1 second.)
2. Does 4WD shift indicator lamp change properly and does buzzer sound?
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YesorNo
Ye s©GO TO 4.
No©Go to ª2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCHº. Refer to TF-66.
4 CHECK 4WD WARNING LAMP
Is 4WD warning lamp turned ON?
YesorNo
Ye s©Perform self-diagnosis. (Refer to ªTrouble Diagnosis without CONSULT-IIº, TF-27.)
No©GO TO 5.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
TF-48

5 CHECK 4WD SHIFT INDICATOR LAMP
1. Move A/T selector lever to ªPº position.
2. Set 4WD shift switch from ª4Hº to ª4LOº.
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3. While shifting from ª4Hº to ª4LOº, does 4WD shift indicator lamp turn OFF and ATP warning lamp turn ON?
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YesorNo
Ye s©GO TO 6.
No©Go to Symptoms 3 and 4. Refer to TF-102.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
TF-49

2 CHECK INPUT SIGNAL
With CONSULT-II
1. Warm up engine to normal operating temperature.
2. Park vehicle on flat surface.
3. Move A/T selector lever to ªPº position.
4. Set 4WD shift switch to ª4Hº position.
5. Set 4WD shift switch to ªAUTOº position.
6. Start engine.
7. Drive for at least 30 seconds at a speed higher than 20 km/h (12 MPH).
(Drive vehicle until ªFLUID TEMP SEº exceeds 0.9V.)
8. Park vehicle on flat surface.
9. Move A/T selector lever to ªPº position.
10. Set 4WD shift switch to ª2WDº position.
11. Leave vehicle for at least 80 seconds with ªFLUID TEMP SEº at 0.9V or less.
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12. Is 4WD warning lamp turned ON?
YesorNo
Ye s©Perform self-diagnosis. Refer to ªTrouble Diagnosis with CONSULT-IIº, TF-30.
No©GO TO 4.
3 CHECK INPUT SIGNAL
Without CONSULT-II
1. Warm up engine to normal operating temperature.
2. Park vehicle on flat surface.
3. Move A/T selector lever to ªPº position.
4. Set 4WD shift switch to ª4Hº position.
5. Set 4WD shift switch to ªAUTOº position.
6. Start engine.
7. Drive vehicle for at least 30 seconds at a speed higher than 20 km/h (12 MPH).
8. Park vehicle on flat surface.
9. Move A/T selector lever to ªPº position.
10. Set 4WD shift switch to ª2WDº position.
11. Is 4WD warning lamp turned ON?
YesorNo
Ye s©Perform self-diagnosis. Refer to ªTrouble Diagnosis without CONSULT-IIº, TF-27.
No©GO TO 4.
4 (1) CHECK TIGHT CORNER BRAKING SYMPTOM
1. Set 4WD shift switch to ªAUTOº position.
2. Drive vehicle at speed lower than 20 km/h (12 MPH) with steering wheel fully turned.
3. Does tight corner braking symptom occur?
YesorNo
Ye s©GO TO 5.
No©GO TO 6.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
TF-52

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TRANSFER CONTROL UNIT INSPECTION TABLENBTF0018S02(Data are reference values.)
Terminal
No.Item Condition Judgement standard
12-4WD shift solenoid
valve
&
4WD shift switch is set to ª2WDº
position.Less than 1V
4WD shift switch is set to any posi-
tion other than ª2WDº.Battery voltage
24WD shift indicator lamp
(2WD)
Lamp lights while system is operating
properly.Less than 1V
&
2WD indicator lamp does not come
on.Battery voltage
3 Ground Ð Ð
4Transfer shift relay
(High)While actuator is operating
(4H,4LO)Battery voltage
Actuator does not operate. Less than 1V
5 4WD warning lampLamp comes ON. (when engine is
stopped.)
(Fail-safe condition appears on
display, engine is stopped, actuator
position detection switch is
inoperative, oil temperature is too
high and/or tires of different size are
installed.)Less than 1V
Except above Battery voltage
6 Ground Ð Ð Ð
7 PNP switch (R position)
&
A/T selector lever is set to ªreverseº
position.Battery voltage
A/T selector lever is set to any posi-
tion other than ªreverseº.Less than 1V
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TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value (Cont'd)
TF-55

Symptom 2. 4WD Warning Lamp Does Not Turn
ON
=NBTF0030SYMPTOM: Although ignition switch is turned ªONº, 4WD
warning lamp does not turn ON.
1 CHECK TRANSFER CONTROL UNIT POWER SOURCE
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1. Turn ignition switch to ªOFFº position and disconnect transfer control unit harness connector.
2. Turn ignition switch to ªONº 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.
IContinuity between ignition switch and transfer control unit
IIgnition 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 ªOFFº position.
2. Disconnect transfer control unit harness connector.
3. Measure resistance between transfer control unit harness connector terminals 6, 45 and body ground.
Resistance: 0W
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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.
I4WD warning lamp
IContinuity between ignition switch and 4WD warning lamp
IContinuity between 4WD warning lamp and transfer control unit
OK or NG
OK©GO TO 4.
NG©IRepair or replace harness or connector.
IReplace 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 ªTRANSFER
CONTROL UNIT INSPECTION TABLEº, ªTROUBLE DIAGNOSIS Ð GENERAL
DESCRIPTIONº, TF-55.
2. If NG, recheck transfer control unit pin terminals for damage or loose connection with
harness connector.
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TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 2. 4WD Warning Lamp Does Not Turn ON (Cont'd)
TF-101

Symptom 3. 4WD Shift Indicator Lamp Does
Not Turn OFF
NBTF0031SYMPTOM: When 4WD shift switch is set from ª4Hº to
ª4LOº, all the 4WD shift indicator lamps do not turn OFF.
1 CHECK ATP SWITCH CIRCUIT
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Check ATP switch circuit.
Refer to ªDiagnostic Procedureº, ªATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCHº, TF-112.
OK or NG
OK©GO TO 2.
NG©Check, repair or replace faulty parts.
2 CHECK PROCEDURE FROM THE BEGINNING AGAIN
Check again.
OK or NG
OK©INSPECTION END
NG©Recheck each connector's pin terminals for damage or loose connection.
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Symptom 4. ATP Warning Lamp Does Not Turn
ON
NBTF0032SYMPTOM: When 4WD shift switch is set from ª4Hº to
ª4LOº with A/T selector lever in ªPº position, ATP warning
lamp does not turn ON.
1 CHECK ATP SWITCH CIRCUIT
Check ATP switch circuit.
Refer to ªDiagnostic Procedureº, ªATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCHº, TF-112.
OK or NG
OK©GO TO 2.
NG©Check, repair or replace faulty parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 3. 4WD Shift Indicator Lamp Does Not Turn OFF
TF-102

2 CHECK FOLLOWING ITEMS
Check the following.
IATP warning lamp
IContinuity between PNP (ªPº position) switch terminal 4 and ATP warning lamp
IContinuity between ATP warning lamp and ATP switch
OK or NG
OK©GO TO 3.
NG©Repair or replace ATP warning lamp, harness or connector.
3 CHECK PNP SWITCH CIRCUIT
Check PNP switch circuit.
Refer to AT-99, ªDTC P0705 Park/Neutral Position Switchº.
OK or NG
OK©GO TO 4.
NG©Check, repair or replace faulty parts.
4 CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.
OK or NG
OK©INSPECTION END
NG©Recheck each connector's pin terminals for damage or loose connection.
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TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 4. ATP Warning Lamp Does Not Turn ON (Cont'd)
TF-103