INFINITI QX56 2011 Factory Service Manual

HEAVY TIGHT-CORNER BRAKING SYMPTOM OCCURS
DLN-99
< SYMPTOM DIAGNOSIS > [TRANSFER: ATX90A]
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SYMPTOM DIAGNOSIS
HEAVY TIGHT-CORNER BRAKING SYMPTOM OCCURS
DescriptionINFOID:0000000006222312
Heavy tight-corner braking symptom o ccurs when the vehicle is driven and the steering wheel is turned fully to
either side after the engine is started.
NOTE:
Light tight-corner braking symptom may occur dependi ng on driving conditions. This is not malfunction.
Diagnosis ProcedureINFOID:0000000006222313
1.PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ECM”.
Is any DTC detected?
YES >> Check the DTC. Refer to EC-98, "DTC Index".
NO >> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Check the DTC. Refer to DLN-29, "DTC Index".
NO >> GO TO 3.
3.CHECK TRANSFER INTERNAL FUNCTION
With CONSULT-III
1. Remove transfer control actuator. Refer to DLN-114, "
Removal and Installation".
2. Turn the actuator shaft. Refer to DLN-114, "
Inspection".
3. Check “ROTARY POSI SEN” of CONSULT-II I “DATA MONITOR” for “ALL MODE AWD/4WD”.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Transfer assembly is mechanical malfunction. Replace transfer assembly. Refer to DLN-121,
"Removal and Installation".
Monitor item Condition Status
ROTARY POSI SEN Turn the actuator shaft. Value is changing
Revision: 2010 May2011 QX56

DLN-100
< SYMPTOM DIAGNOSIS >[TRANSFER: ATX90A]
4WD MODE DOES NOT CHANGE
4WD MODE DOES NOT CHANGE
DescriptionINFOID:0000000006222314
Vehicle does not enter 4-wheel drive mode even though 4WD warning lamp turned to OFF.
Diagnosis ProcedureINFOID:0000000006222315
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Check DTC. Refer to DLN-29, "DTC Index".
NO >> GO TO 2.
2.CHECK 4WD MODE INDICATOR LAMP
Check 4WD mode indicator lamp function. Refer to DLN-98, "
Component Function Check".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Proceed to diagnosis procedure. Refer to DLN-98, "
Diagnosis Procedure".
3.CHECK 4WD SHIFT SWITCH
Perform rouble diagnosis of the 4WD shift switch. Refer to DLN-67, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Transfer assembly is mechanical malfunction. Replace transfer assembly. Refer to DLN-121,
"Removal and Installation".
NO >> Replace 4WD switch assembly. Refer to DLN-108, "
Removal and Installation".
Revision: 2010 May2011 QX56

4WD MODE INDICATOR LAMP CONTINUES BLINKINGDLN-101
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4WD MODE INDICATOR LAMP CONTINUES BLINKING
DescriptionINFOID:0000000006222316
After shift the 4WD mode 4H to 4L, 4WD mode indicator lamp continues to blink.
Diagnosis ProcedureINFOID:0000000006222317
1.MOVE THE VEHICLE
Move the vehicle back and forth.
Does the 4WD indicator lamp stop to blink?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK 4WD MODE INDICATOR LAMP
Check 4WD mode indicator lamp function. Refer to DLN-98, "
Component Function Check".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Proceed to diagnosis procedure. Refer to DLN-98, "
Diagnosis Procedure".
3.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Check DTC. Refer to DLN-29, "DTC Index".
NO >> Transfer assembly is mechanical malfunction. Replace transfer assembly. Refer to DLN-121,
"Removal and Installation".
Revision: 2010 May2011 QX56

DLN-102
< SYMPTOM DIAGNOSIS >[TRANSFER: ATX90A]
4WD WARNING LAMP BLINKS QUICKLY
4WD WARNING LAMP BLINKS QUICKLY
DescriptionINFOID:0000000006222318
While driving, 4WD warning lamp blinks 2 times in 1 second and it turns OFF after 1 minute.
 This symptom protects drivetrain parts when a heavy
load is applied to the electric controlled coupling and
multiple disc clutch temperature increases. Also, opt ional distribution of torque sometimes becomes rigid
before lamp blinks quickly. Both cases are not malfunction.
 When this symptom occurs, stop vehicle and allow it to idle for some times. Blinking will stop and system will be restored.
Revision: 2010 May2011 QX56

4WD WARNING LAMP BLINKS SLOWLYDLN-103
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4WD WARNING LAMP BLINKS SLOWLY
DescriptionINFOID:0000000006222319
4WD warning lamp blinks at approximately 2 seconds intervals while driving.
Diagnosis ProcedureINFOID:0000000006222320
1.CHECK TIRE
Check the following.
 Tire pressure
 Wear condition
 Front and rear tire size (There is no difference between front and rear tires.)
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts. And t hen, drive the vehicle at speed of 20 km/h (12 MPH)
or more for 5 seconds or more. Improper size information is initialized accordingly.
2.TERMINAL INSPECTION
Check 4WD control unit harness connector for disconnection.
Is the inspection result normal?
YES >> Replace transfer control unit. Refer to DLN-107, "Removal and Installation".
NO >> Repair or replace the error-detected parts.
Revision: 2010 May2011 QX56

DLN-104
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INFORMATION DISPLAY IS NOT DISPLAYED
INFORMATION DISPLAY IS NOT DISPLAYED
DescriptionINFOID:0000000006222321
Information display is not displayed.
NOTE:
When the combination meter receives 4WD shift swit
ch signal, it displays a message on the information dis-
play and inform the driver of 4WD mode st atus. About indication contents, refer to DLN-18, "
4WD SYSTEM :
System Description" (4WD mode).
Diagnosis ProcedureINFOID:0000000006222322
1.CHECK 4WD SHIFT SWITCH
Perform trouble diagnosis for 4WD shift switch. Refer to DLN-67, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK 4WD MODE INDICATOR LAMP
Perform trouble diagnosis for 4WD mode indicator. Refer to DLN-98, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK THE INFORMATION DISPLAY
Check that information except 4WD mode is displayed on information display.
Is the inspection result normal?
YES >> Replace transfer control unit. Refer to DLN-107, "Removal and Installation".
NO >> Check information display. Refer to MWI-29, "
On Board Diagnosis Function".
Revision: 2010 May2011 QX56

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGDLN-105
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NOISE, VIBRATION AND HARSHN ESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000006222323
Use the chart below to find the cause of the symptom. The number s indicate the order of the inspection. If necessary, repair or replace these
parts.
Reference
DLN-106, "
Inspection
"—
Front oil seal: DLN-109, "
Exploded View
"
Rear oil seal: DLN-111, "
Exploded View
"
—
—
—
SUSPECTED PARTS
(Possible cause)
TRANSFER FLUID (Level low)
TRANSFER FLUID (Wrong)
TRANSFER FLUID (Level too high)
LIQUID GASKET (Damaged)
OIL SEAL (Worn or damaged)
GEAR (Worn or damaged)
BEARING (Worn or damaged)
TRANSFER CASE (Damaged)
Symptom Noise 1 2 3 3 3
Transfer fluid leakage 4 1 2 2 3
Revision: 2010 May2011 QX56

DLN-106
< PERIODIC MAINTENANCE >[TRANSFER: ATX90A]
TRANSFER FLUID
PERIODIC MAINTENANCE
TRANSFER FLUID
InspectionINFOID:0000000006222324
FLUID LEAKAGE
Check transfer surrounding area (oil seal, drain plug, and filler plug etc.) for fluid leakage.
FLUID LEVEL
1. Remove filler plug (1) and gasket. Then check that fluid is filled
up from mounting hole for the filler plug.
CAUTION:
Never start engine whil e checking fluid level.
2. Set a new gasket onto filler plug (1), and install it on transfer and then tighten to the specified torque.
CAUTION:
Never reuse gasket.
DrainingINFOID:0000000006222325
1. Run the vehicle to warm up the transfer unit sufficiently.
2. Stop the engine.
3. Remove the drain plug (1) and drain transfer fluid.
4. Set a new gasket onto drain plug (1), and install it to transfer andtighten to the specified torque.
CAUTION:
Never reuse gasket.
RefillingINFOID:0000000006222326
1. Remove filler plug (1). Fill up with new transfer fluid up to mount-ing hole for the filler plug.
CAUTION:
Carefully fill the fluid. (Fill up for approximately 3 minutes.)
2. Leave the vehicle for 3 minutes, and check the fluid level again.
3. Set a new gasket onto filler plug, and install it on transfer and tighten to the specified torque.
CAUTION:
Never reuse gasket.
4. Perform learning of transfer fluid viscosity. Refer to DLN-47, "
Work Procedure".
Specified torque : 33 N·m (3.4 kg-m, 24 ft-lb)
JPDIE0295ZZ
Specified torque : 33 N-m (3.4 kg-m, 24 ft-lb)
JPDIE0245ZZ
Fluid grade and Viscosity : Refer to
MA-10, "Fluids
and Lubricants".
Fluid capacity : Refer to DLN-124, "
Gen-
eral Specifications".
Specified torque : 33 N-m (3.4 kg-m, 24 ft-lb)
JPDIE0295ZZ
Revision: 2010 May2011 QX56

TRANSFER CONTROL UNITDLN-107
< REMOVAL AND INSTALLATION > [TRANSFER: ATX90A]
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REMOVAL AND INSTALLATION
TRANSFER CONTROL UNIT
Removal and InstallationINFOID:0000000006222327
REMOVAL
1. Turn the ignition switch OFF.
2. Disconnect negative battery terminal. CAUTION:
Wait for 5 seconds after turning ignition switch OFF.
3. Remove the glove box assembly. Refer to IP-14, "
Removal and Installation".
4. Disconnect the transfer control unit connector.
5. Move instrument lower cover to backward. Refer to IP-14, "
Removal and Installation".
6. Remove the transfer control unit.
INSTALLATION
Note the following, and install in the reverse order of removal.
 When replacing transfer control unit, perform writing unit parameter and initial calibration. Refer to DLN-41,
"Work Procedure".
Revision: 2010 May2011 QX56

DLN-108
< REMOVAL AND INSTALLATION >[TRANSFER: ATX90A]
4WD MODE SWITCH
4WD MODE SWITCH
Removal and InstallationINFOID:0000000006222328
REMOVAL
NOTE:
4WD shift switch is integrated in 4WD switch assembly.
1. Remove console finisher assembly from center console assembly. Refer to
IP-25, "
Removal and Installa-
tion"
2. Disconnect 4WD switch assembly harness connector.
3. Press 4WD switch assembly fixing pawls, and remove 4WD switch assembly from console finisher
assembly.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56