INFINITI QX56 2006 Factory Service Manual

SRS-60
COLLISION DIAGNOSIS
Revision: November 20092006 QX56
COLLISION DIAGNOSISPFP:00015
For Frontal CollisionEHS001N3
Check the SRS components using the following table.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-20, "
SRS Operation Check" .
SRS INSPECTION (FOR FRONTAL COLLISION)
PartSRS is activated SRS is NOT activated
Driver air bag module If the driver air bag has deployed:
REPLACE
Install with new fas-
teners. If the driver air bag has NOT been activated:
1. Remove driver air bag module. Check harness cover and connectors for damage,
terminals for deformities, and harness for binding.
2. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.
3. If no damage is found, reinstall with new fasteners.
4. If damaged —REPLACE. Install driver air bag modules with new fasteners.
Front passenger air
bag module If the front passenger
air bag has deployed:
REPLACE
Install with new fas-
teners. If the front passenger air bag has NOT been activated:
1. Remove front passenger air bag module. Check harness cover and connectors for
damage, terminals for deformities, and harness for binding.
2. Install front passenger air bag module into the instrument panel to check fit with the instrument panel.
3. If no damage is found, reinstall with new fasteners.
4. If damaged —REPLACE. Install front passenger air bag modules with new fasten-
ers.
Crash zone sensor If any of the front air bags or seat belt pre-
tensioners* have
been activated:
REPLACE the crash
zone sensor and
bracket with new fas-
teners.
*: Confirm seat belt
pre-tensioner activa-
tion using CONSULT-
II only. If the front air bags or seat belt pre-tensioners have NOT been activated:
1. Remove the crash zone sensor. Check harness connectors for damage, terminals
for deformities, and harness for binding.
2. Check for visible signs of damage (dents, cracks, deformation) of the crash zone sensor and bracket.
3. Install the crash zone sensor to check fit.
4. If no damage is found, reinstall with new fasteners.
5. If damaged —REPLACE the crash zone sensor and bracket with new fasteners.
Seat belt pre-ten-
sioner assemblies
(All applicable loca-
tions: buckle, reel, lap
outer) If either the driver or
passenger seat belt
pre-tensioner* has
been activated:
REPLACE all seat
belt pre-tensioner
assemblies with new
fasteners.
*: Confirm seat belt
pre-tensioner activa-
tion using CONSULT-
II only. If the pre-tensioners have NOT been activated:
1. Remove seat belt pre-tensioners.
Check harness cover and connectors for damage, terminals for deformities, and
harness for binding.
2. Check belts for damage and anchors for loose mounting.
3. Check retractor for smooth operation.
4. Check seat belt adjuster for damage.
5. Check for deformities of the center pillar inner.
6. If the center pillar inner has no damage, REPLACE the seat belt pre-tensioner assembly.
7. If no damage is found, reinstall seat belt pre-tensioner assembly.
8. If damaged —REPLACE. Install the seat belt pre-tensioners with new fasteners.
Diagnosis sensor unit If any of the SRS components have
been activated:
REPLACE the diag-
nosis sensor unit.
Install with new fas-
teners. If none of the SRS components have been activated:
1. Check case for dents, cracks or deformities.
2. Check connectors for damage, and terminals for deformities.
3. If no damage is found, reinstall with new fasteners.
4. If damaged
—REPLACE. Install diagnosis sensor unit with new fasteners.

COLLISION DIAGNOSISSRS-61
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SRS
Revision: November 2009 2006 QX56
For Side and Rollover CollisionEHS001N4
Check the SRS components using the following table.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-20, "
SRS Operation Check" .
WHEN SRS IS ACTIVATED IN THE SIDE OR ROLLOVER COLLISION
1. Replace the following components:
–Front seat back assembly (on the side on which side air bag is activated)
–Diagnosis sensor unit
–(LH or RH) side air bag (satellite) sensor (on the side on which side air bag is activated)
2. Check the SRS components and the related parts using the following table.
–Replace any SRS components and the related parts showing visible signs of damage (dents, cracks,
deformation).
3. Conduct self-diagnosis using CONSULT-II and “AIR BAG” warning lamp. Refer to SRS-20, "
SRS Opera-
tion Check" for details. Ensure entire SRS operates properly.
WHEN SRS IS NOT ACTIVATED IN THE SIDE OR ROLLOVER COLLISION
1. Check the SRS components and the related parts using the following table.
–If the front seat back assembly is damaged, the front seat back assembly must be replaced.
2. Conduct self-diagnosis using CONSULT-II and “AIR BAG” warning lamp. Refer to SRS-20, "
SRS Opera-
tion Check" for details. Ensure entire SRS operates properly.
Steering wheel 1. Visually check steering wheel for deformities.
2. Check harness (built into steering wheel) and connectors for damage, and terminals for deformities.
3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.
4. Check steering wheel for excessive free play.
5. If no damage is found, reinstall.
6. If damaged—REPLACE.
Spiral cable If the driver front air
bag has deployed:
REPLACE the spiral
cable. If the driver front air bag has not deployed:
1. Visually check spiral cable and combination switch for damage.
2. Check connectors and protective tape for damage.
3. Check steering wheel for noise, binding or heavy operation.
4. If no damage is found, reinstall.
5. If damaged
—REPLACE.
Occupant classifica-
tion system (Passen-
ger seat) 1. Remove passenger seat.
2. Check control unit case for dents, cracks of deformities.
3. Check connectors and pressure sensor tube for damage, and terminals for deformities.
4. Check seat frame and cushion pan for dents or deformities.
5. If no damage is found, reinstall seat with new fasteners.
6. If damaged
— REPLACE seat cushion assembly with new fasteners.
Harness and connec-
tors 1. Check connectors for poor connection, damage, and terminals for deformities.
2. Check harness for binding, chafing, cuts, or deformities.
3. If no damage is found, reinstall the harness and connectors.
4. If damaged—
REPLACE the damaged harness. Do not attempt to repair, splice or modify any SRS harness.
Instrument panel If the passenger front air bag has deployed:
REPLACE the instru-
ment panel assembly.If the passenger front air bag has NOT deployed:
1. Visually check instrument panel for damage.
2. If no damage is found, reinstall the instrument panel.
3. If damaged—
REPLACE the instrument panel.
Part
SRS is activated SRS is NOT activated

SRS-62
COLLISION DIAGNOSIS
Revision: November 20092006 QX56
SRS INSPECTION (FOR SIDE AND ROLLOVER COLLISION)
PartSRS is activated SRS is NOT activated
LH side curtain air
bag module If the LH side curtain
air bag has deployed:
REPLACE the LH
side curtain air bag
module. (Repair the
center pillar inner, etc.
before installing new
one if damaged.)If the LH side curtain air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the center pillar on
the collision side.
2. If damaged—Remove the LH side curtain air bag module.
3. Check for visible signs of damaged (tears etc.) of the LH side curtain air bag mod- ule.
4. Check harness and connectors for damage, and terminals for deformities.
5. If no damage is found, reinstall the LH side curtain air bag module with new fasten- ers.
6. If damaged—REPLACE the LH side curtain air bag module with new fasteners.
RH side curtain air
bag module If the RH side curtain
air bag has deployed:
REPLACE the RH
side curtain air bag
module. (Repair the
center pillar inner, etc.
before installing new
one if damaged.)If the RH side curtain air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the center pillar on
the collision side.
2. If damaged—Remove the RH side curtain air bag module.
3. Check for visible signs of damaged (tears etc.) of the RH side curtain air bag mod- ule.
4. Check harness and connectors for damage, and terminals for deformities.
5. If no damage is found, reinstall the RH side curtain air bag module with new fasten- ers.
6. If damaged —REPLACE the RH side curtain air bag module with new fasteners.
Front LH side air bag
module If the front LH side air
bag has deployed:
REPLACE front LH
seatback assembly.If the front LH side air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the seat back on
the collision side.
2. Check harness and connectors for damage, and terminals for deformities.
3. If damaged—REPLACE the front LH seatback assembly.
Front RH side air bag
module If the front RH side air
bag has deployed:
REPLACE front RH
seatback assembly.If the front RH side air bag has NOT deployed:
1. Check for visible signs of damage (dents, tears, deformation) of the seat back on
the collision side.
2. Check harness and connectors for damage, and terminals for deformities.
3. If damaged—REPLACE the front RH seatback assembly.
(LH or RH) side air
bag (satellite) sensor If any of the SRS
components have
deployed:
REPLACE the side
air bag (satellite) sen-
sor on the collision
side with new fasten-
ers. (Repair the cen-
ter pillar inner, etc.
before installing new
one if damaged.)If none of the SRS components have been activated:
1. Remove the side air bag (satellite) sensor on the collision side. Check harness
connectors for damage, terminals for deformities, and harness for binding.
2. Check for visible signs of damage (dents, cracks, deformation) of the side air bag (satellite) sensor.
3. Install the side air bag (satellite) sensor to check fit.
4. If no damage is found, reinstall the side sir bag (satellite) sensor with new fasten- ers.
5. If damaged—REPLACE the side air bag (satellite) sensor with new fasteners.
Diagnosis sensor unit If any of the SRS components have
deployed:
REPLACE the diag-
nosis sensor unit with
new fasteners.If none of the SRS components have been activated:
1. Check case and bracket for dents, cracks or deformities.
2. Check connectors for damage, and terminals for deformities.
3. If no damage is found, reinstall the diagnosis sensor unit with new fasteners.
4. If damaged—REPLACE the diagnosis sensor unit with new fasteners.

COLLISION DIAGNOSISSRS-63
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SRS
Revision: November 2009 2006 QX56
Seat belt pre-ten-
sioner assemblies
(All applicable loca-
tions: buckle, reel, lap
outer)If either the driver or
passenger seat belt
pre-tensioner* has
been activated:
REPLACE all seat
belt pre-tensioner
assemblies with new
fasteners.
*: Confirm seat belt
pre-tensioner activa-
tion using CONSULT-
II only.If the pre-tensioners have NOT been activated:
1. Remove seat belt pre-tensioners.
Check harness cover and connectors for damage, terminals for deformities, and
harness for binding.
2. Check belts for damage and anchors for loose mounting.
3. Check retractor for smooth operation.
4. Check seat belt adjuster for damage.
5. Check for deformities of the center pillar inner.
6. If the center pillar inner has no damage, REPLACE the seat belt pre-tensioner assembly.
7. If no damage is found, reinstall seat belt pre-tensioner assembly.
8. If damaged— REPLACE. Install the seat belt pre-tensioners with new fasteners.
Seat (with front side
air bag) If either the front LH
or front RH side air
bag modules has
been deployed:
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

SRS-64
COLLISION DIAGNOSIS
Revision: November 20092006 QX56

TF-1
TRANSFER
D DRIVELINE/AXLE
CONTENTS
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A
B
TF
Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 4
Precautions for Transfer Assembly and Transfer
Control Unit Replacement ................................... ..... 4
METHOD FOR POSITION ADJUSTMENT ...... ..... 4
Precautions ......................................................... ..... 4
Service Notice .......................................................... 5
PREPARATION ...................................................... ..... 6
Special Service Tools .......................................... ..... 6
Commercial Service Tools ................................... ..... 9
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING ........................................... ... 10
NVH Troubleshooting Chart ................................ ... 10
TRANSFER FLUID ................................................ ....11
Replacement ....................................................... .... 11
DRAINING ........................................................ .... 11
FILLING ............................................................ .... 11
Inspection ............................................................ .... 11
FLUID LEAKAGE AND FLUID LEVEL ............. .... 11
ALL-MODE 4WD SYSTEM ................................... ... 12
Cross-section View ............................................. ... 12
Power Transfer .................................................... ... 13
POWER TRANSFER DIAGRAM ..................... ... 13
POWER TRANSFER FLOW ............................ ... 14
System Description ............................................. ... 15
CONTROL SYSTEM ........................................ ... 15
TRANSFER MOTOR ....................................... ... 16
WAIT DETECTION SWITCH ........................... ... 17
NEUTRAL-4LO SWITCH ................................. ... 17
ATP SWITCH ................................................... ... 17
2-4WD SHIFT SOLENOID VALVE ................... ... 17
CLUTCH PRESSURE SOLENOID VALVE ...... ... 18
LINE PRESSURE SWITCH ............................. ... 18
CLUTCH PRESSURE SWITCH ....................... ... 18
TRANSFER FLUID TEMPERATURE SENSOR ... 18
TRANSFER CONTROL UNIT .......................... ... 18
TRANSFER CONTROL DEVICE ..................... ... 18
4WD SHIFT SWITCH AND INDICATOR LAMP ... 184WD WARNING LAMP ....................................
... 19
ATP WARNING LAMP ...................................... ... 19
System Diagram ..................................................... 19 COMPONENTS FUNCTION ............................ ... 20
CAN Communication .............................................. 20 SYSTEM DESCRIPTION ................................. ... 20
TROUBLE DIAGNOSIS ......................................... ... 21
How to Perform Trouble Diagnosis ...................... ... 21
BASIC CONCEPT ............................................ ... 21
Location of Electrical Parts .................................. ... 22
Circuit Diagram ....................................................... 23
Wiring Diagram — T/F — .................................... ... 24
Inspections Before Trouble Diagnosis ................. ... 32
TRANSFER FLUID CHECK ............................. ... 32
PREPARATION FOR ROAD TEST .................. ... 32
CHECK BEFORE ENGINE IS STARTED ........ ... 32
CHECK AT IDLE ............................................... ... 32
CRUISE TEST ..................................................... 33
Trouble Diagnosis Chart for Symptoms ............... ... 34
Transfer Control Unit Input/Output Signal Refer-
ence Values ......................................................... ... 35
TRANSFER CONTROL UNIT INSPECTION
TABLE .............................................................. ... 35
CONSULT-II Function (ALL MODE AWD/4WD) .. ... 44
FUNCTION ....................................................... ... 44
CONSULT-II SETTING PROCEDURE ............. ... 44
SELF-DIAG RESULT MODE ............................ ... 45
DATA MONITOR MODE ................................... ... 47
WORK SUPPORT ............................................ ... 49
Self-diagnostic Procedure ................................... ... 50
SELF-DIAGNOSTIC PROCEDURE (WITH
CONSULT-II) .................................................... ... 50
SELF-DIAGNOSTIC PROCEDURE (WITHOUT
CONSULT-II) .................................................... ... 50
ERASE SELF-DIAGNOSIS .............................. ... 53
TROUBLE DIAGNOSIS FOR SYSTEM ................. ... 54
Power Supply Circuit For Transfer Control Unit ... ... 54
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 54
TRANSFER CONTROL UNIT TERMINALS AND

TF-2Revision: November 20092006 QX56
REFERENCE VALUE .......................................
... 54
DIAGNOSTIC PROCEDURE ........................... ... 55
COMPONENT INSPECTION ........................... ... 57
Transfer Control Unit ........................................... ... 57
DIAGNOSTIC PROCEDURE ........................... ... 57
Output Shaft Revolution Signal (TCM) ................ ... 58
DIAGNOSTIC PROCEDURE ........................... ... 58
Vehicle Speed Sensor (ABS) ............................... ... 58
DIAGNOSTIC PROCEDURE ........................... ... 58
Neutral-4LO Switch ................................................ 59 CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 59
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 59
DIAGNOSTIC PROCEDURE ........................... ... 60
COMPONENT INSPECTION ........................... ... 62
4WD Shift Switch ................................................. ... 62
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 62
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 62
DIAGNOSTIC PROCEDURE ........................... ... 63
COMPONENT INSPECTION ........................... ... 66
Wait Detection Switch .......................................... ... 66
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 66
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 66
DIAGNOSTIC PROCEDURE ........................... ... 67
COMPONENT INSPECTION ........................... ... 69
PNP Switch Signal (TCM) ................................... ... 69
DIAGNOSTIC PROCEDURE ........................... ... 69
Actuator Motor ..................................................... ... 70
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 70
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 70
DIAGNOSTIC PROCEDURE ........................... ... 71
COMPONENT INSPECTION ........................... ... 76
Actuator Position Switch ...................................... ... 77
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 77
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 77
DIAGNOSTIC PROCEDURE ........................... ... 78
COMPONENT INSPECTION ........................... ... 80
Transfer Control Device ....................................... ... 81
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 81
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 81
DIAGNOSTIC PROCEDURE ........................... ... 82
Engine Speed Signal (ECM) ................................ ... 85
DIAGNOSTIC PROCEDURE ........................... ... 85
Clutch Pressure Solenoid .................................... ... 86
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 86
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 86DIAGNOSTIC PROCEDURE ............................
... 87
COMPONENT INSPECTION ............................ ... 90
2-4WD Solenoid ................................................... ... 91
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 91
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 91
DIAGNOSTIC PROCEDURE ............................ ... 91
COMPONENT INSPECTION ............................ ... 94
Transfer Motor ...................................................... ... 95
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. ... 95
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... ... 96
DIAGNOSTIC PROCEDURE ............................ ... 97
COMPONENT INSPECTION ............................ .102
Transfer Fluid Temperature .................................. .102
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. .102
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... .102
DIAGNOSTIC PROCEDURE ............................ .103
COMPONENT INSPECTION ............................ .104
Clutch Pressure Switch ........................................ .105
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. .105
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... .105
DIAGNOSTIC PROCEDURE ............................ .106
COMPONENT INSPECTION ............................ .107
Line Pressure Switch ........................................... .108
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. .108
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... .108
DIAGNOSTIC PROCEDURE ............................ .109
COMPONENT INSPECTION ............................ .110
Throttle Position Signal (ECM) ............................. . 111
DIAGNOSTIC PROCEDURE ............................ . 111
ABS Operation Signal (ABS) ............................... . 111
DIAGNOSTIC PROCEDURE ............................ . 111
VDC Operation Signal (ABS) ............................... .112
DIAGNOSTIC PROCEDURE ............................ .112
TCS Operation Signal (ABS) ............................... .112
DIAGNOSTIC PROCEDURE ............................ .112
CAN Communication Line .................................... .113
DIAGNOSTIC PROCEDURE ............................ .113
ATP Switch ........................................................... .113
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ............................................. .113
TRANSFER CONTROL UNIT TERMINALS AND
REFERENCE VALUE ....................................... .113
DIAGNOSTIC PROCEDURE ............................ .114
COMPONENT INSPECTION ............................ .115
TROUBLE DIAGNOSIS FOR SYMPTOMS ........... .117
4WD Shift Indicator Lamp and 4LO Indicator Lamp
Do Not Turn ON ................................................... .117
SYMPTOM: ....................................................... .117
DIAGNOSTIC PROCEDURE ............................ .117

TF-3
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Revision: November 2009 2006 QX56
4WD Warning Lamp Does Not Turn ON .............
. 121
SYMPTOM: ...................................................... . 121
DIAGNOSTIC PROCEDURE ........................... . 121
4WD Shift Indicator Lamp or 4LO Indicator Lamp
Does Not Change ................................................ . 123
SYMPTOM: ...................................................... . 123
DIAGNOSTIC PROCEDURE ........................... . 124
ATP Warning Lamp Turns ON ............................. . 125
SYMPTOM: ...................................................... . 125
DIAGNOSTIC PROCEDURE ........................... . 125
4LO Indicator Lamp Repeats Flashing ................ . 127
SYMPTOM: ...................................................... . 127
DIAGNOSTIC PROCEDURE ........................... . 127
4WD Warning Lamp Flashes Rapidly ................. . 128
SYMPTOM: ...................................................... . 128
DIAGNOSTIC PROCEDURE ........................... . 128
4WD Warning Lamp Flashes Slowly ................... . 129
SYMPTOM: ...................................................... . 129
DIAGNOSTIC PROCEDURE ........................... . 129
Heavy Tight-corner Braking Symptom Occurs .... . 130
SYMPTOM: ...................................................... . 130
DIAGNOSTIC PROCEDURE ........................... . 130
4WD System Does Not Operate ......................... . 131
SYMPTOM: ...................................................... . 131
DIAGNOSTIC PROCEDURE ........................... . 131
TRANSFER CONTROL UNIT ................................ . 132
Removal and Installation ..................................... . 132
REMOVAL ........................................................ . 132
INSTALLATION ................................................ . 132
FRONT OIL SEAL ................................................. . 133
Removal and Installation ..................................... . 133
REMOVAL ........................................................ . 133
INSTALLATION ................................................ . 134
REAR OIL SEAL ................................................... . 135
Removal and Installation ..................................... . 135
REMOVAL ........................................................ . 135
INSTALLATION ................................................ . 135SIDE OIL SEAL ......................................................
.137
Removal and Installation ..................................... .137
REMOVAL ........................................................ .137
INSTALLATION ................................................ .137
TRANSFER CONTROL DEVICE ........................... .138
Removal and Installation ..................................... .138
AIR BREATHER HOSE ......................................... .139
Removal and Installation ..................................... .139
TRANSFER MOTOR .............................................. .142
Removal and Installation ..................................... .142
REMOVAL ........................................................ .142
INSTALLATION ................................................ .142
TRANSFER OIL FILTER ........................................ .143
Removal and Installation ..................................... .143
REMOVAL ........................................................ .143
INSTALLATION ................................................ .143
TRANSFER ASSEMBLY ....................................... .145
Removal and Installation ..................................... .145
REMOVAL ........................................................ .145
INSTALLATION ................................................ .145
Disassembly and Assembly ................................. .146
COMPONENTS ................................................ .146
DISASSEMBLY ................................................ .148
INSPECTION AFTER DISASSEMBLY ............. .163
ASSEMBLY ...................................................... .167
SERVICE DATA AND SPECIFICATIONS (SDS) ... .183
General Specifications ......................................... .183
Inspection and Adjustment .................................. .183
CLEARANCE BETWEEN INNER GEAR AND
OUTER GEAR .................................................. .183
CLUTCH ........................................................... .183
PINION GEAR END PLAY ............................... .183
CLEARANCE BETWEEN SHIFT FORK AND
SLEEVE ........................................................... .183
SELECTIVE PARTS ......................................... .183

TF-4
PRECAUTIONS
Revision: November 20092006 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EDS002H3
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 per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal 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
harness connectors.
Precautions for Transfer Assembly and Transfer Control Unit ReplacementEDS002H4
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 TF-4, "
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-47, "
How to Erase Self-diagnostic Results" (with CONSULT-II) or TF-
53, "ERASE SELF-DIAGNOSIS" (without CONSULT-II).
7. Check 4WD shift indicator lamp. Refer to TF-32, "
CHECK BEFORE ENGINE IS STARTED" .
If 4WD shift indicator lamp does not indicate "2WD", install new transfer control unit and retry the above
check.
PrecautionsEDS002H5

Before connecting or disconnecting the transfer control
unit harness connector, turn ignition switch “OFF” and dis-
connect battery ground cable. Failure to do so may damage
the transfer control unit. Battery voltage is applied to trans-
fer control unit even if ignition switch is turned “OFF”.
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PRECAUTIONSTF-5
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TF
Revision: November 2009 2006 QX56

When connecting or disconnecting pin connectors into or
from transfer control unit, take care not to damage pin ter-
minals (bend or break).
When connecting pin connectors make sure that there are
not any bends or breaks on transfer control unit pin termi-
nals.

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 Control Unit Input/Output Signal Reference Val-
ues" .
Service NoticeEDS002H6

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
certain 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
tightening 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.

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.
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