service INFINITI QX56 2007 Factory Service Manual

SRS-52
< SERVICE INFORMATION >
COLLISION DIAGNOSIS
Seat (with front side
air bag)If either the front LH or
front RH side air bag
modules has been de-
ployed:
REPLACE front seat-
back assembly on the
deployed side.If the front LH or front RH side air bag modules have NOT deployed:
1. Visually check the seat on the collision side.
2. Remove the seat on the collision side and check the following for damage and
deformities.
- Harness, connectors and terminals
- Frame and recliner (for front and rear seat), and also adjuster and slides (for front
seat)
3. If no damage is found, reinstall the seat.
4. If damaged—REPLACE the damaged seat parts using new fasteners. If the front
seat back is damaged, the front seat back assembly must be replaced.
Center inner pillar 1. Check the center inner pillar on the collision side for damage (dents, cracks, deformation).
2. If damaged—REPAIR the center inner pillar.
Trim/headlining 1. Check for visible signs of damage (dents, cracks, deformation) of the interior trim on the collision side.
2. If damaged—REPLACE the damaged trim parts. Part SRS is activated SRS is NOT activated

TF-1
DRIVELINE/AXLE
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SECTION TF
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CONTENTS
TRANSFER
SERVICE INFORMATION ............................3
PRECAUTIONS ...................................................3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
3
Precaution for Transfer Assembly and Transfer
Control Unit Replacement .........................................
3
Precaution .................................................................4
Service Notice ...........................................................4
PREPARATION ...................................................6
Special Service Tool .................................................6
Commercial Service Tool ..........................................9
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ............................
10
NVH Troubleshooting Chart ....................................10
TRANSFER FLUID .............................................11
Replacement ...........................................................11
Inspection ................................................................11
ALL-MODE 4WD SYSTEM ................................12
Cross-Sectional View ..............................................12
Power Transfer ........................................................12
System Description .................................................14
Schematic ...............................................................19
CAN Communication ...............................................20
TROUBLE DIAGNOSIS .....................................21
How to Perform Trouble Diagnosis .........................21
Location of Electrical Parts ......................................22
Circuit Diagram .......................................................23
Wiring Diagram - T/F - .............................................24
Inspections Before Trouble Diagnosis ....................31
Trouble Diagnosis Chart by Symptom ....................34
Transfer Control Unit Input/Output Signal Refer-
ence Value ..............................................................
35
CONSULT-II Function (ALL MODE AWD/4WD) .....42
Self-Diagnosis Procedure .......................................48
TROUBLE DIAGNOSIS FOR SYSTEM ............51
Power Supply Circuit for Transfer Control Unit ........51
Transfer Control Unit ...............................................53
Output Shaft Revolution Signal (TCM) ....................53
Vehicle Speed Sensor (ABS) ..................................54
Neutral-4LO Switch .................................................54
4WD Shift Switch .....................................................57
Wait Detection Switch ..............................................60
PNP Switch Signal (TCM) .......................................63
Actuator Motor .........................................................64
Actuator Position Switch ..........................................69
Transfer Control Device ...........................................72
Engine Speed Signal (ECM) ....................................76
Clutch Pressure Solenoid ........................................76
2-4WD Solenoid ......................................................80
Transfer Motor .........................................................84
Transfer Fluid Temperature .....................................90
Clutch Pressure Switch ...........................................92
Line Pressure Switch ...............................................94
Throttle Position Signal (ECM) ................................97
ABS Operation Signal (ABS) ...................................97
VDC Operation Signal (ABS) ...................................98
TCS Operation Signal (ABS) ...................................98
CAN Communication Line .......................................99
ATP Switch ..............................................................99
TROUBLE DIAGNOSIS FOR SYMPTOMS ....102
4WD Shift Indicator Lamp and 4LO Indicator
Lamp Do Not Turn ON ...........................................
102
4WD Warning Lamp Does Not Turn ON ...............104
4WD Shift Indicator Lamp or 4LO Indicator Lamp
Does Not Change ..................................................
107
ATP Warning Lamp Turns ON ...............................109
4LO Indicator Lamp Repeats Flashing ..................110
4WD Warning Lamp Flashes Rapidly ....................111
4WD Warning Lamp Flashes Slowly .....................112
Heavy Tight-corner Braking Symptom Occurs ......113
4WD System Does Not Operate ............................114
TRANSFER CONTROL UNIT .........................115
Removal and Installation .......................................115

TF-2
FRONT OIL SEAL ...........................................116
Removal and Installation .......................................116
REAR OIL SEAL ..............................................118
Removal and Installation .......................................118
SIDE OIL SEAL ...............................................120
Removal and Installation .......................................120
TRANSFER CONTROL DEVICE .....................121
Removal and Installation .......................................121
AIR BREATHER HOSE ...................................122
Removal and Installation .......................................122
TRANSFER MOTOR ........................................125
Removal and Installation .......................................125
TRANSFER OIL FILTER ..................................126
Removal and Installation .......................................126
TRANSFER ASSEMBLY ..................................128
Removal and Installation .......................................128
Disassembly and Assembly ..................................128
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................
166
General Specification ............................................166
Inspection and Adjustment ....................................166

PRECAUTIONS
TF-3
< SERVICE INFORMATION >
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SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000003532506
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SRS section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
Precaution for Transfer Assembly and Transfer Control Unit ReplacementINFOID:0000000003532507
When replacing transfer assembly or transfer control unit, check the 4WD shift indicator lamp as follows.
1. Turn ignition switch “ON”.
2. Check 4WD shift indicator lamp is turned ON for approx. 1 second.
• If OK, the position between transfer assembly and transfer control unit is correct.
• If NG, the position is different between transfer assembly and transfer control unit.
Adjust the position between transfer assembly and transfer control unit. Refer to "METHOD FOR POSITION
ADJUSTMENT".
METHOD FOR POSITION ADJUSTMENT
1. Start engine. Run the engine for at least 10 seconds.
2. Stop vehicle and move A/T selector lever to “N” position with brake pedal depressed. Stay in "N" for at
least 2 seconds.
3. Turn 4WD shift switch to “2WD” position. Stay in "2WD" for at least 2 seconds.
4. Turn ignition switch “OFF”.
5. Start engine.
6. Erase self-diagnosis. Refer to TF-42, "
CONSULT-II Function (ALL MODE AWD/4WD)" (with CONSULT-II)
or TF-48, "
Self-Diagnosis Procedure" (without CONSULT-II).
7. Check 4WD shift indicator lamp. Refer to TF-31, "
Inspections Before Trouble Diagnosis".
If 4WD shift indicator lamp does not indicate "2WD", install new transfer control unit and retry the above
check.

TF-4
< SERVICE INFORMATION >
PRECAUTIONS
Precaution
INFOID:0000000003532508
•Before connecting or disconnecting the transfer control unit
harness connector, turn ignition switch “OFF” and disconnect
battery ground cable. Failure to do so may damage the trans-
fer control unit. Battery voltage is applied to transfer control
unit even if ignition switch is turned “OFF”.
•When connecting or disconnecting pin connectors into or
from transfer control unit, take care not to damage pin termi-
nals (bend or break).
When connecting pin connectors make sure that there are not
any bends or breaks on transfer control unit pin terminals.
•Before replacing transfer control unit, perform transfer con-
trol unit input/output signal inspection and make sure transfer
control unit functions properly. Refer to TF-35, "
Transfer Con-
trol Unit Input/Output Signal Reference Value".
Service NoticeINFOID:0000000003532509
• After overhaul refill the transfer with new transfer fluid.
• Check the fluid level or replace the fluid only with the vehicle parked on level ground.
• During removal or installation, keep inside of transfer clear of dust or dirt.
• Disassembly should be done in a clean work area.
• Before proceeding with disassembly, thoroughly clean the transfer. It is important to prevent the internal
parts from becoming contaminated by dirt or other foreign matter.
• Check for the correct installation status prior to removal or disassembly. If matchmarks are required, be cer-
tain they do not interfere with the function of the parts when applied.
• All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.
• Check appearance of the disassembled parts for damage, deformation, and unusual wear. Replace them
with new ones if necessary.
• Gaskets, seals and O-rings should replaced any time the transfer is disassembled.
• In principle, tighten bolts or nuts gradually in several steps working diagonally from inside to outside. If tight-
ening sequence is specified, use it.
• Observe the specified torque when assembling.
• Clean and flush the parts sufficiently and blow-dry them.
• Be careful not to damage sliding surfaces and mating surfaces.
SEF289H
SEF291H
MEF040DB

PRECAUTIONS
TF-5
< SERVICE INFORMATION >
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• Use lint-free cloth or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the transfer.

TF-6
< SERVICE INFORMATION >
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000003532510
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
KV40104000
(—)
Flange wrench• Removing self-lock nut
• Installing self-lock nut
a: 85 mm (3.35 in)
b: 65 mm (2.56 in)
KV381054S0
(J-34286)
Puller• Removing front oil seal
• Removing rear oil seal
• Removing metal bushing
KV38100500
(—)
Drift• Installing front oil seal
a: 80 mm (3.15 in) dia.
b: 60 mm (2.36 in) dia.
ST30720000
(J-25405)
Drift• Installing rear oil seal
• Installing mainshaft front bearing and oil
seal
a: 77 mm (3.03 in) dia.
b: 55.5 mm (2.185 in) dia.
KV40105310
(—)
Drift• Installing dust cover
a: 89 mm (3.50 in) dia.
b: 80.7 mm (3.17 in) dia.
ST22360002
(J-25679-01)
Drift• Installing side oil seal
a: 23 mm (0.91 in) dia.
b: 32 mm (1.26 in) dia.
NT659
ZZA0601D
ZZA0811D
ZZA0811D
ZZA1003D
ZZA1091D

PREPARATION
TF-7
< SERVICE INFORMATION >
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ST35300000
(—)
Drift• Removing sun gear assembly and planetary
carrier assembly
• Removing carrier bearing
• Installing metal bushing
a: 59 mm (2.32 in) dia.
b: 45 mm (1.77 in) dia.
ST33200000
(J-26082)
Drift• Removing mainshaft front bearing
• Installing sun gear assembly and planetary
carrier assembly
• Installing mainshaft front bearing and oil
seal
a: 74.5 mm (2.933 in) dia.
b: 62.5 mm (2.461 in) dia.
ST30031000
(—)
Puller• Removing carrier bearing
• Removing front drive shaft front bearing
• Removing front drive shaft rear bearing
a: 90 mm (3.54 in) dia.
b: 50 mm (1.97 in) dia.
ST33710000
(—)
Drift• Removing needle bearing
• Removing metal bushing
a: 24 mm (0.94 in) dia.
b: 89 mm (3.5 in)
c: 30 mm (1.18 in) dia.
ST35325000
(—)
Drift bar• Removing metal bushing
a: 215 mm (8.46 in)
b: 25 mm (0.98 in) dia.
c: M12 × 1.5P
ST33052000
(—)
Adapter• Removing front drive shaft front bearing
• Removing front drive shaft rear bearing
• Installing mainshaft
a: 28 mm (1.10 in) dia.
b: 22 mm (0.87 in) dia.
ST22452000
(J-34335)
Drift• Removing press flange snap ring
• Installing press flange snap ring
a: 45 mm (1.77 in) dia.
b: 36 mm (1.42 in) dia.
c: 400 mm (15.76 in) dia. Tool number
(Kent-Moore No.)
Tool nameDescription
NT073
NT661
NT411
ZZA1057D
NT663
NT431
NT117

TF-8
< SERVICE INFORMATION >
PREPARATION
ST30911000
(—)
Puller• Removing press flange snap ring
• Installing press flange snap ring
• Installing mainshaft
• Installing carrier bearing
a: 98 mm (3.86 in) dia.
b: 40.5 mm (1.594 in) dia.
KV31103300
(—)
Drift• Removing press flange snap ring
• Installing press flange snap ring
• Installing carrier bearing
a: 76.3 mm (3.004 in) dia.
b: 130 mm (5.12 in)
KV38100300
(J-25523)
Drift• Removing mainshaft rear bearing
a: 54 mm (2.13 in) dia.
b: 46 mm (1.81 in) dia.
c: 32 mm (1.26 in) dia.
ST15310000
(J-25640-B)
Drift• Installing mainshaft rear bearing
a: 96 mm (3.78 in) dia.
b: 84 mm (3.31 in) dia.
KV40100621
(J-25273)
Drift• Installing front drive shaft front bearing
• Installing front drive shaft rear bearing
a: 76 mm (2.99 in) dia.
b: 69 mm (2.72 in) dia.
ST30032000
(J-26010-01)
Base• Installing front drive shaft front bearing
• Installing front drive shaft rear bearing
a: 38 mm (1.50 in) dia.
b: 80 mm (3.15 in) dia.
ST33220000
(—)
Drift• Installing needle bearing
a: 37 mm (1.46 in) dia.
b: 31 mm (1.22 in) dia.
b: 22 mm (0.87 in) dia. Tool number
(Kent-Moore No.)
Tool nameDescription
NT664
NT668
ZZA1046D
ZZA0908D
NT086
NT660
ZZA1046D

PREPARATION
TF-9
< SERVICE INFORMATION >
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Commercial Service ToolINFOID:0000000003532511
Tool nameDescription
Puller• Removing companion flange
Pin punch• Removing retainer pin
• Installing retainer pin
a: 6 mm (0.24 in) dia.
Power tool• Removing transfer case assembly
NT077
NT410
PBIC0190E