2006 INFINITI QX56 Factory Service Manual

TPMS reset belt fuse box location fuse diagram relay air bleeding

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INFINITI QX56 2006 Factory Service Manual SRS-64
COLLISION DIAGNOSIS
Revision: November 20092006 QX56

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INFINITI QX56 2006 Factory Service Manual TF-1
TRANSFER
D DRIVELINE/AXLE
CONTENTS
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Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 4
Precautions for

TF-1
TRANSFER
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CONTENTS
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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

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INFINITI QX56 2006 Factory Service Manual TF-2Revision: November 20092006 QX56
REFERENCE VALUE .......................................
... 54
DIAGNOSTIC PROCEDURE ........................... ... 55
COMPONENT INSPECTION ....................

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

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INFINITI QX56 2006 Factory Service Manual TF-3
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4WD Warning Lamp Does Not Turn ON .............
. 121
SYMPTOM: ...................................................... . 121
DIAGNOSTIC

TF-3
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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

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INFINITI QX56 2006 Factory Service Manual 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 Re

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”.
SEF289H

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INFINITI QX56 2006 Factory Service Manual PRECAUTIONSTF-5
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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

PRECAUTIONSTF-5
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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.
SEF291H
MEF040DB

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INFINITI QX56 2006 Factory Service Manual TF-6
PREPARATION
Revision: November 20092006 QX56
PREPARATIONPFP:00002
Special Service ToolsEDS003B4
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated he

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INFINITI QX56 2006 Factory Service Manual PREPARATIONTF-7
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Revision: November 2009 2006 QX56
ST33200000
(J-26082)
DriftRemoving mainshaft front bearing
Installing sun gear assembly and planetary
carrier assembly
I

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