2007 INFINITI QX56 Factory Service Manual

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Page 2849 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
TF-27
< SERVICE INFORMATION >
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BDWA0169E

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INFINITI QX56 2007 Factory Service Manual TF-28
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TROUBLE DIAGNOSIS
BDWA0170E

Page 2851 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
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INFINITI QX56 2007 Factory Service Manual TF-30
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TROUBLE DIAGNOSIS
BDWA0172E

Page 2853 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
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Inspections Before Trouble DiagnosisINFOID:0000000003532524
TRANSFER FLUID CHECK
Check fluid for leaks and fluid level.

Page 2854 of 3061

INFINITI QX56 2007 Factory Service Manual TF-32
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
• The purpose of the test is to determine overall performance of
transfer and analyze causes of problems.
• When a malfunction is found in any part

TF-32
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
• The purpose of the test is to determine overall performance of
transfer and analyze causes of problems.
• When a malfunction is found in any part of transfer, perform the
road test to locate the malfunction area and repair the malfunction
parts.
• The road test consists of the following three parts.
- Check before engine is started. Refer to "CHECK BEFORE
ENGINE IS STARTED".
- Check at idle. Refer to "CHECK AT IDLE" .
- Cruise test. Refer to "CRUISE TEST".
CHECK BEFORE ENGINE IS STARTED
1.CHECK 4WD SHIFT INDICATOR LAMP
1. Park vehicle on flat surface.
2. Turn ignition switch to “OFF” position.
3. Move A/T selector lever to “P” position.
4. Set 4WD shift switch to “2WD” position.
5. Turn ignition switch to “ON” position. (Do not start engine.)
Does 4WD shift indicator lamp turn ON for approximately 1 second?
YES >> GO TO 2.
NO >> Go to TF-107, "
4WD Shift Indicator Lamp or 4LO Indicator Lamp Does Not Change".
2.CHECK 4WD WARNING LAMP
1. Turn ignition switch to “OFF” position.
2. Move A/T selector lever to “P” position.
3. Set 4WD shift switch to “2WD” position.
4. Turn ignition switch to “ON” position. (Do not start engine.)
Does 4WD warning lamp turn ON?
YES >> GO TO "CHECK AT IDLE".
NO >> GO TO TF-104, "
4WD Warning Lamp Does Not Turn ON".
CHECK AT IDLE
1.CHECK 4WD SHIFT INDICATOR LAMP
1. Park vehicle on flat surface and engage the parking brake.
2. Turn ignition switch to “OFF” position.
3. Move A/T selector lever to “P” position.
4. Set 4WD shift switch to “2WD” position.
5. Start engine.
Does 4WD shift indicator lamp turn ON?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK 4WD WARNING LAMP
Check 4WD warning lamp state?
Is 4WD warning lamp turned ON?
YES >> Perform the self-diagnosis. Refer to TF-48, "Self-Diagnosis Procedure" or TF-48, "Self-Diagnosis
Procedure".
NO >> Go to TF-102, "
4WD Shift Indicator Lamp and 4LO Indicator Lamp Do Not Turn ON".
3.CHECK 4WD SHIFT INDICATOR AND 4LO INDICATOR OPERATION
SMT089D

Page 2855 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
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1. Brake pedal depressed.
2. Move A/T selector lever to “N” position.
3. Set 4WD shift switch to “2WD”, “AUTO�

Page 2856 of 3061

INFINITI QX56 2007 Factory Service Manual TF-34
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Trouble Diagnosis Chart by Symptom
INFOID:0000000003532525
If 4WD warning lamp turns ON, perform self-diagnosis. Refer to TF-48, "Self-Diagnosis Procedu

TF-34
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Trouble Diagnosis Chart by Symptom
INFOID:0000000003532525
If 4WD warning lamp turns ON, perform self-diagnosis. Refer to TF-48, "Self-Diagnosis Procedure" .
NOTE:
• Light tight-corner braking symptom may occur depending on driving conditions in AUTO mode. This is not a
malfunction.
Symptom Condition Check item Reference page
4WD shift indicator lamp and 4LO indicator
lamp do not turn ON
(4WD shift indicator lamp and 4LO indicator
lamp check)Ignition switch: ONPower supply and ground for transfer
control unit
TF-102
Transfer shut off relay
Combination meter
4WD warning lamp does not turn ON
(4WD warning lamp check)Ignition switch: ONPower supply and ground for transfer
control unit
TF-104
Transfer shut off relay
Combination meter
4WD shift indicator lamp or 4LO indicator
lamp does not changeEngine running4WD shift switch
TF-107
Wait detection switch
Neutral-4LO switch
ATP switch
2-4WD solenoid
Transfer control device
Actuator motor
Actuator position switch
Transfer inner parts
ATP warning lamp turns ON Engine runningCAN communication line
TF-109
4WD shift switch
PNP switch signal
ATP switch
Combination meter
Transfer inner parts
4LO indicator lamp repeats flashing Engine runningWait detection switch
TF-110
Neutral-4LO switch
Transfer inner parts
4WD warning lamp flashes rapidly (2 times/
second)While drivingTransfer fluid temperature
TF-111
Tire size is different between front and
rear of vehicle
4WD warning lamp flashes slowly
(1 time/2 seconds)While drivingTire size is different between front and
rear of vehicle.
TF-112
Transfer fluid temperature
Clutch pressure switch
Heavy tight-corner braking symptom occurs
(See NOTE.)• While driving
•AUTO mode
• Steering wheel is
turned fully to either
sideCAN communication line
TF-113
4WD shift switch
Accelerator pedal position signal
Clutch pressure solenoid
Transfer inner parts
4WD system does not operate While driving4WD shift switch
TF-114
Clutch pressure switch
Transfer inner parts

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