check engine INFINITI QX56 2011 Factory Service Manual

POWER SUPPLY AND GROUND CIRCUITDLN-93
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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POWER SUPPLY AND GROUND CIRCUIT
DescriptionINFOID:0000000006222306
Supplies power to 4WD system.
Diagnosis ProcedureINFOID:0000000006222307
1.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the voltage between transfer control unit harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start the engine.
5. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#34).
3. Check the harness for open or short between transfe r control unit harness connector No.20 terminal and
10A (#34).
Is the inspection result normal?
YES >> Perform the trouble diagnosis fo r power supply circuit. Refer to PG-11, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
1. Turn the ignition switch OFF.
2. Check the voltage between transfer control unit harness connector and ground.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer control unit harness connector and ground.
Transfer control unit — Voltage
Connector Terminal
E59 20 Ground Battery voltage
Transfer control unit — Voltage
Connector Terminal
E59 20 Ground Battery voltage
Transfer control unit — Voltage
Connector Terminal
E59 32 Ground Approx. 0 V
Transfer control unit — Voltage
Connector Terminal
E59 32 Ground Battery voltage
Revision: 2010 May2011 QX56

DLN-94
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#56).
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5. Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES >> Perform the trouble diagnosis for ignition power supply circuit. Refer to PG-89, "Wiring Diagram -
IGNITION POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
5.CHECK TRANSFER MOTOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Check the voltage between transfer control unit harness connector and ground.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.CHECK TRANSFER MOTOR POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check the 30A fusible link (J).
3. Check the harness for open or short between transfe r control unit harness connector No.41 terminal and
30A fusible link (J).
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit. Refer to PG-11, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
7.CHECK 4WD SWITCH ASSEMBLY POWER SUPPLY (1)
1. Turn the ignition switch OFF.
IPDM E/R Transfe r control unit
Continuity
Connector Terminal Connector Terminal
E15 58 E59 32 Existed
Transfer control unit —Continuity
Connector Terminal
E59 32 Ground Not existed
Transfer control unit —Voltage
Connector Terminal
E60 41 Ground Battery voltage
Transfer control unit —Voltage
Connector Terminal
E60 41 Ground Battery voltage
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITDLN-95
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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2. Disconnect 4WD switch assembly harness connector.
3. Check the voltage between 4WD switch assembly harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start the engine.
5. Check the voltage between 4WD switch assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.CHECK 4WD SWITCH ASSEMBLY POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#13).
3. Disconnect fuse block (J/B) harness connector.
4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5. Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES >> Perform the trouble diagnosis for ignition power supply circuit. Refer to PG-89, "Wiring Diagram -
IGNITION POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
9.CHECK TRANSFER CONTROL UNIT GROUND
1. Turn the ignition switch OFF.
2. Check the voltage between transfer control unit harness connector and ground.
3. Check the continuity between transfer control unit harness connector and ground.
4WD switch assembly — Voltage
Connector Terminal
M54 12 Ground Approx. 0 V
4WD switch assembly — Voltage
Connector Terminal
M54 12 Ground Battery voltage
Fuse block (J/B) 4WD switch assembly Continuity
Connector Terminal Connector Terminal
M3 10C M54 12 Existed
4WD switch assembly —Continuity
Connector Terminal
M54 12 Ground Not existed
Transfer control unit — Voltage
Connector Terminal
E60 44
Ground Approx. 0 V
46
Transfer control unit —Continuity
Connector Terminal
E60 44
Ground Existed
46
Revision: 2010 May2011 QX56

4WD WARNING LAMPDLN-97
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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4WD WARNING LAMP
Component Function CheckINFOID:0000000006222308
1.CHECK 4WD WARNING LAMP FUNCTION
1. Turn the ignition switch OFF to ON.
2. Check that 4WD warning lamp light up.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed diagnosis procedure. Refer to DLN-97, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222309
1.CHECK POWER SUPPLY AND GROUND CIRCUIT
Perform the trouble diagnosis for power supply and ground circuit. Refer to DLN-64, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the error-detected parts.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Check the DTC.
NO >> GO TO 3.
3.CHECK 4WD WARNING LAMP SIGNAL
With CONSULT-III
1. Turn the ignition switch ON. CAUTION:
Never start the engine.
2. Check “4WD FAIL LAMP” of CONSULT-III “DATA MONITOR” for “ALL MODE AWD/4WD”.
Does the item on
“DATA MONITOR” indicate “On”?
YES >> Check combination meter. Refer to MWI-64, "COMBINATION METER : Diagnosis Procedure".
NO >> Replace transfer control unit. Refer to DLN-107, "
Removal and Installation".
Revision: 2010 May2011 QX56

DLN-98
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
4WD INDICATOR LAMP
4WD INDICATOR LAMP
Component Function CheckINFOID:0000000006222310
1.CHECK 4WD MODE INDICATOR LAMP FUNCTION
1. Start the engine CAUTION:
Never drive the vehicle.
2. Turn the 4WD shift switch AUTO ⇒4H ⇒4LO ⇒4H ⇒AUTO.
3. Check the 4WD shift switch position (“AUTO”, “4H” and “4L”) and the indication of the 4WD mode indica-
tor lamp mutually coincide.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to diagnosis procedure. Refer to DLN-98, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222311
1.CHECK POWER SUPPLY AND GROUND CIRCUIT
Perform the trouble diagnosis for power supply and ground circuit. Refer to DLN-64, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace the error-detected parts.
2.CHECK 4WD WARNING LAMP SIGNAL
With CONSULT-III
1. Strat the engine.
CAUTION:
Never drive the vehicle.
2. Turn the 4WD shift switch AUTO ⇒4H ⇒4LO ⇒4H ⇒AUTO.
3. Check “4WD MODE IND” of CONSULT-III “DATA MONITOR” for “ALL MODE AWD/4WD”.
Is the inspection result normal?
YES >> Check combination meter. Refer to MWI-64, "COMBINATION METER : Diagnosis Procedure".
NO >> Replace transfer control unit. Refer to DLN-107, "
Removal and Installation".
Monitor item Condition Status
4WD MODE IND 4WD shift switch: AUTO AUTO
4WD shift switch: 4H 4H
4WD shift switch: 4L 4L
Revision: 2010 May2011 QX56

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-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

DLN-116
< REMOVAL AND INSTALLATION >[TRANSFER: ATX90A]
TRANSFER HI-LO POSITION SENSOR
TRANSFER HI-LO POSITION SENSOR
Exploded ViewINFOID:0000000006222337
Removal and InstallationINFOID:0000000006222338
REMOVAL
1. Turn the ignition switch OFF.
2. Disconnect negative battery terminal.
CAUTION:
Wait for 5 seconds after turn ing ignition switch OFF.
3. Remove exhaust front tube (LH). Refer to EX-5, "
Removal and Installation".
4. Support transfer assembly and transmission assembly with a jack.
5. Remove front suspension rear cross member with a power tool. Refer to TM-208, "
4WD : Removal and
Installation".
6. Remove rear engine mounting cross member with a power tool. Refer to TM-208, "
4WD : Removal and
Installation".
7. Remove heat insulator of exhaust front tube (LH).
8. Lower jack to the position where the tr ansfer Hi-Lo position sensor can be removed.
9. Disconnect the transfer Hi-Lo position sensor connector.
10. Remove the transfer Hi-Lo position sensor.
11. Perform inspection after removal. Refer to DLN-116, "
Inspection".
INSTALLATION
Note the following, and install in the reverse order of removal.
 Never damage O-ring of transfer Hi-Lo position sensor.
 Perform inspection after installation. Refer to DLN-116, "
Inspection".
InspectionINFOID:0000000006222339
INSPECTION AFTER REMOVAL
Check the O-ring assembled transfer Hi-Lo position sens or for wear, crack and damage. Replace the transfer
Hi-Lo position sensor if there is malfunction.
INSPECTION AFTER INSTALLATION
After driving, check the surface fitting transfer Hi-Lo position sensor to transfer assembly for fluid leakage.
1. Transfer Hi-Lo position sensor 2. Transfer assembly
: Vehicle front
Refer to GI-4, "
Components" for symbols not described above.
JPDIE0282GB
Revision: 2010 May2011 QX56

TRANSFER LOCK POSITION SENSORDLN-119
< REMOVAL AND INSTALLATION > [TRANSFER: ATX90A]
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TRANSFER LOCK PO SITION SENSOR
Exploded ViewINFOID:0000000006222343
Removal and InstallationINFOID:0000000006222344
REMOVAL
1. Turn the ignition switch OFF.
2. Disconnect negative battery terminal.
CAUTION:
Wait for 5 seconds after turning ignition OFF.
3. Support transfer assembly and transmission assembly with a jack.
4. Remove rear engine mounting cross member with a power tool. Refer to TM-208, "
4WD : Removal and
Installation".
5. Lower jack to the position where the tr ansfer lock position sensor can be removed.
6. Disconnect the transfer lock position sensor connector.
7. Remove the transfer lock position sensor.
8. Perform inspection after removal. Refer to DLN-119, "
Inspection".
INSTALLATION
Note the following, and install in the reverse order of removal.
 Never damage O-ring of transfer lock position sensor.
 Perform inspection after installation. Refer to DLN-119, "
Inspection".
 When replacing the transfer lock position sensor, perform learning of transfer lock position sensor. Refer to
DLN-44, "
Work Procedure".
InspectionINFOID:0000000006222345
INSPECTION AFTER REMOVAL
Check the O-ring assembled transfer lock position sensor for wear, crack and damage. Replace the transfer
lock position sensor if there is malfunction.
INSPECTION AFTER INSTALLATION
After driving, check the surface fitting transfer lock position sensor to transfer assembly for fluid leakage.
1. Transfer lock position sensor 2. Transfer assembly
: Vehicle front
Refer to GI-4, "
Components" for symbols not described above.
JPDIE0284GB
Revision: 2010 May2011 QX56

FRONT PROPELLER SHAFTDLN-129
< REMOVAL AND INSTALLATION > [FRONT PROPELLER SHAFT: 2F P15]
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Removal and InstallationINFOID:0000000006222357
REMOVAL
1. Shift the transmission to the neutral pos ition, and then release the parking brake.
2. Remove protector A and B with power tool. Refer to SCS-39, "
PPMU, MIDDLE TUBE ASSEMBLY, PPMU
PIPE : Removal and Installation".
3. Remove rear engine mount cross member with a power tool. Refer to TM-208, "
4WD : Removal and
Installation".
4. Put matching mark (A) on front propeller shaft flange yoke and final drive companion flange.
CAUTION:
For matching mark, use paint. Never damage propeller shaft
flange and final drive companion flange.
5. Put matching mark (A) on front propeller shaft flange yoke and transfer companion flange.
CAUTION:
For matching mark, use paint. Never damage propeller shaft
flange and transfer companion flange.
6. Remove the propeller shaft assembly fixing bolts.
7. Remove propeller shaft assembly from the front final drive and transfer.
8. Perform inspection after removal. Refer to DLN-131, "
Inspection".
INSTALLATION
Note the following, and install in the reverse order of removal.
 Align matching mark (A) to install propeller shaft flange yoke and
transfer companion flange.
 Align matching mark (A) to install propeller shaft flange yoke and front final drive companion flange.
 After assembly, perform a driving test to check propeller shaft
vibration. If vibration occurred, separate propeller shaft from final
drive. Reinstall companion flange after rotating it by 90, 180, 270
degrees. Then perform driving test and check propeller shaft vibra-
tion again at each point.
 If propeller shaft or final drive has been replaced, connect them as follows:
- Install the propeller shaft while aligning its matching mark (A) with the matching mark (B) on the joint as close as possible.
Disassembly and AssemblyINFOID:0000000006222358
DISASSEMBLY
JPDID0207ZZ
JPDID0207ZZ
PDIA0423E
Revision: 2010 May2011 QX56