2005 INFINITI QX4 service indicator

RSU-1
REAR SUSPENSION
E SUSPENSION
CONTENTS
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SECTION RSU
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RSU
Revision: October 20052005 QX56 PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Rear Suspension ............................ 3
PREPARATION ........................................................... 4
Commercial Service Tools ........................................ 4
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 5
NVH Troubleshooting Chart ..................................... 5
CAN COMMUNICATION ............................................ 6
System Description .................................................. 6
TROUBLE DIAGNOSIS .............................................. 7
How to Perform Trouble Diagnoses for Quick and
Accurate Repair ....................................................... 7
INTRODUCTION ................................................... 7
CLARIFY CONCERN ............................................ 7
WORK FLOW ........................................................ 8
Component Parts and Harness Connector Location ..... 9
Wiring Diagram — A/SUSP — ............................... 10
Basic Inspection ..................................................... 12
AIR HOSES ......................................................... 12
POWER SYSTEM TERMINAL LOOSENESS
AND BATTERY INSPECTION ............................ 12
CK SUSP INDICATOR LAMP INSPECTION ...... 12
CK SUSP Indicator Lamp Timing ........................... 12
Control Unit Input/Output Signal Standard ............. 12
CONSULT-II Function (AIR LEVELIZER) ............... 13
CONSULT-II BASIC OPERATION PROCEDURE
... 13
WORK SUPPORT ............................................... 14
SELF-DIAGNOSIS .............................................. 14
DATA MONITOR ................................................. 15
ACTIVE TEST ..................................................... 16
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ....................................................................... 17
Height Sensor System Inspection .......................... 17
Exhaust Valve Solenoid System Inspection ........... 19
Compressor Motor, Compressor Motor Relay and Circuit Inspection .................................................... 20
TROUBLE DIAGNOSES FOR SYMPTOMS ............ 23
Load Leveling Rear Air Suspension System Does
Not Operate ............................................................ 23
CK SUSP Indicator Lamp Stays On When Ignition
Switch Is Turned On ............................................... 24
REAR SUSPENSION ASSEMBLY ........................... 25
Components ........................................................... 25
On-Vehicle Inspection and Service ......................... 26
SHOCK ABSORBER INSPECTION .................... 26
Wheel Alignment Inspection ................................... 27
PRELIMINARY INSPECTION ............................. 27
GENERAL INFORMATION AND RECOMMEN-
DATIONS ............................................................. 27
THE ALIGNMENT PROCESS ............................. 28
CAMBER ............................................................. 28
TOE-IN ................................................................ 28
REAR SUSPENSION MEMBER ............................... 30
Removal and Installation ........................................ 30
REMOVAL ........................................................... 31
INSPECTION AFTER REMOVAL ....................... 32
INSTALLATION ................................................... 33
SHOCK ABSORBER ................................................ 34
Removal and Installation ........................................ 34
REMOVAL ........................................................... 34
INSTALLATION ................................................... 34
INSPECTION AFTER INSTALLATION ................ 34
SUSPENSION ARM .................................................. 35
Removal and Installation ........................................ 35
REMOVAL ........................................................... 35
INSPECTION AFTER REMOVAL ....................... 35
INSTALLATION ................................................... 36
FRONT LOWER LINK .............................................. 37
Removal and Installation ........................................ 37
REMOVAL ........................................................... 37
INSPECTION AFTER REMOVAL ....................... 37
INSTALLATION ................................................... 38

RSU-28
REAR SUSPENSION ASSEMBLY
Revision: October 20052005 QX56

Check with the manufacturer of your specific alignment machine for their recommended Service/Cali-
bration Schedule.
THE ALIGNMENT PROCESS
IMPORTANT: Use only the alignment specifications listed in this Service Manual. Refer to RSU-47, "Wheel
Alignment"
1. When displaying the alignment settings, many alignment machines use “indicators”: (Green/red, plus or
minus, Go/No Go). Do NOT use these indicators.

The alignment specifications programmed into your alignment machine that operate these indicators
may not be correct.

This may result in an ERROR.
2. Some newer alignment machines are equipped with an optional “Rolling Compensation” method to “com-
pensate” the sensors (alignment targets or head units). Do NOT use this “Rolling Compensation”
method.

Use the “Jacking Compensation” method. After installing the alignment targets or head units, raise the
vehicle and rotate the wheels 1/2 turn both ways.

See Instructions in the alignment machine you are using for more information.
CAMBER
1. Measure camber of both the right and left wheels with a suitable
alignment gauge and adjust as necessary to specification.
2. If outside of the specified value, adjust the camber using the
adjusting bolt in the front lower link.
CAUTION:
After adjusting the camber then check the toe-in.
NOTE:
Camber changes about 0° 5' with each graduation of the adjust-
ing bolt.
3. Tighten the adjusting bolt nuts to specification.
TOE-IN
1. Bounce the rear of the vehicle up and down two to three times to stabilize the vehicle height. Refer to
RSU-48, "
Wheelarch Height (Unladen*1 )" .
2. Push the vehicle straight ahead about 5 m (16 ft).
3. Put a mark on the base line of the tread (rear side) of both of the
tires at the same height as the center of the hub. This will be the
measuring points.
4. Measure the distance “A” (rear side) across from tire to tire.Camber : Refer to RSU-47, "
Wheel Alignment" .
SRA0 96 A
LEIA0041E
SFA614B

SC-1
STARTING & CHARGING SYSTEM
K ELECTRICAL
CONTENTS
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G
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SECTION SC
A
B
SC
Revision: October 20052005 QX56 PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
Wiring Diagrams and Trouble Diagnosis .................. 2
PREPARATION ........................................................... 3
Special Service Tool ................................................. 3
Commercial Service Tools ........................................ 3
BATTERY .................................................................... 4
How to Handle Battery ............................................. 4
METHODS OF PREVENTING OVER-DIS-
CHARGE ............................................................... 4
CHECKING ELECTROLYTE LEVEL .................... 4
SPECIFIC GRAVITY CHECK ............................... 5
CHARGING THE BATTERY ................................. 6
Trouble Diagnoses with Battery/Starting/Charging
System Tester .......................................................... 6
DIAGNOSTIC RESULT ITEM CHART .................. 8
Removal and Installation .......................................... 9
REMOVAL ............................................................. 9
INSTALLATION ..................................................... 9
STARTING SYSTEM ................................................ 10
System Description ................................................ 10
Wiring Diagram — START — ..................................11
Trouble Diagnoses with Battery/Starting/Charging
System Tester ........................................................ 12
DIAGNOSTIC RESULT ITEM CHART ................ 12
WORK FLOW ...................................................... 13DIAGNOSTIC PROCEDURE 1 ........................... 14
DIAGNOSTIC PROCEDURE 2 ........................... 15
MINIMUM SPECIFICATION OF CRANKING
VOLTAGE REFERENCING COOLANT TEM-
PERATURE ......................................................... 16
Removal and Installation ........................................ 16
REMOVAL ........................................................... 16
INSTALLATION ................................................... 16
CHARGING SYSTEM ............................................... 17
System Description ................................................. 17
Wiring Diagram — CHARGE — ............................. 18
Trouble Diagnoses with Battery/Starting/Charging
System Tester ......................................................... 19
DIAGNOSTIC RESULT ITEM CHART ................ 20
WORK FLOW ...................................................... 21
DIAGNOSTIC PROCEDURE 1 ........................... 22
DIAGNOSTIC PROCEDURE 2 ........................... 23
DIAGNOSTIC PROCEDURE 3 ........................... 23
DIAGNOSTIC PROCEDURE 4 ........................... 24
DIAGNOSTIC PROCEDURE 5 ........................... 26
MALFUNCTION INDICATOR .............................. 27
Removal and Installation ........................................ 27
REMOVAL ........................................................... 27
INSTALLATION ................................................... 27
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 28
Battery .................................................................... 28
Starter ..................................................................... 28
Generator ............................................................... 28

SE-42
AUTOMATIC DRIVE POSITIONER
Revision: October 20052005 QX56
NOTE:
If active test is performed, reset seat memory and keyfob interlock drive positioner after performing work.
DISPLAY ITEM LIST
CAN Communication Inspection Using CONSULT-II (Self-Diagnosis)EIS004XP
1. SELF-DIAGNOSTIC RESULT CHECK
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1. Connect to CONSULT-II, and select “AUTO DRIVE POS.” on the “SELECT DIAG SYSTEM” screen.
2. Select “SELF-DIAG RESULTS” on "SELECT DIAG MODE" screen.
3. Check display content in self-diagnostic results.
Contents displayed
No malfunction>>Inspection End.
Malfunction in CAN communication system>>After printing the monitor items, go to “CAN System”. Refer to
LAN-3, "
Precautions When Using CONSULT-II" .
Symptom ChartEIS004XQ
Test item Description
SEAT SLIDE The sliding motor is activated by receiving the drive signal.
SEAT RECLINING The reclining motor is activated by receiving the drive signal.
SEAT LIFTER FR The lifting motor (front) is activated by receiving the drive signal.
SEAT LIFTER RR The lifting motor (rear) is activated by receiving the drive signal.
PEDAL MOTOR The pedal adjust motor is activated by receiving the drive signal.
MEMORY SW INDCTR The memory switch indicator is lit by receiving the drive signal.
MIRROR MOTOR RHThe RH mirror motor moves the mirror UP/DOWN and LEFT/RIGHT by receiving the drive
signal.
MIRROR MOTOR LHThe LH mirror motor moves the mirror UP/DOWN and LEFT/RIGHT by receiving the drive
signal.
CONSULT-II display code Diagnosis item
U1000INITIAL DIAG
TRANSMIT DIAG
BCM
METER/M&A
ECM
SymptomDiagnoses / service procedure Refer to
page
Only setting change function cannot be set with display.1. Preliminary checkSE-35
2. CAN communication inspection using CONSULT-II (self-
diagnosis)SE-42
3. If the above systems are normal, check display system.AV- 6 1
A part of seat system does not operate (both automati-
cally and manually).1. Sliding motor circuit inspection SE-44
2. Reclining motor circuit inspection SE-45
3. Lifting motor (front) circuit inspectionSE-46
4. Lifting motor (rear) circuit inspectionSE-48
5. If the above systems are normal, replace the driver seat
control unit.SE-11

AUTOMATIC DRIVE POSITIONER
SE-43
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Revision: October 20052005 QX56
A part of pedal adjust and door mirror does not operate
(both automatically and manually).1. Pedal adjusting motor circuit inspectionSE-492. Mirror motor LH circuit check SE-50
3. Mirror motor RH circuit check SE-52
4. If the above systems are normal, replace the automatic
drive positioner control unit.SE-11
A part of seat system does not operate (only automatic
operation).1. Sliding sensor circuit inspectionSE-55
2. Reclining sensor circuit inspectionSE-56
3. Lifting sensor (front) circuit inspectionSE-57
4. Lifting sensor (rear) circuit inspectionSE-58
5. If the above systems are normal, replace the driver seat
control unit.SE-11
A part of door mirror system does not operate (only
automatic operation).1. Mirror sensor LH circuit checkSE-602. Mirror sensor RH circuit checkSE-62
3. If the above systems are normal, replace the automatic
drive positioner control unit.SE-11
All of the automatic operations do not operate.1. Park switch circuit inspectionSE-82
2. UART communication line circuit inspectionSE-86
3. Pedal adjusting sensor circuit inspectionSE-59
4. Steering wheel tilt sensor circuit inspectionSE-64
4. If all the above systems are normal, replace the auto-
matic drive positioner control unit.SE-11
A part of seat system does not operate (only manual
operation).1. Sliding switch circuit inspectionSE-66
2. Reclining switch circuit inspectionSE-67
3. Lifting switch (front) circuit inspectionSE-69
4. Lifting switch (rear) circuit inspectionSE-70
5. If the above systems are normal, replace the driver seat
control unit.SE-11
A part of pedal adjust and door mirror does not operate
(only manual operation).1. Pedal adjusting switch circuit inspection SE-72
2. Door mirror remote control switch (change over switch)
circuit inspection SE-74
3. Door mirror remote control switch (mirror switch) switch-
ing circuit inspection SE-75
4. If the above systems are normal, replace the automatic
drive positioner control unit.SE-11
Only memory switch operation.1. Seat memory switch circuit inspectionSE-782. If the above systems are normal, replace the driver seat
control unit.SE-11
Seat memory indicator lamps 1 and 2 do not illuminate.1. Seat memory indicator lamp circuit inspectionSE-792. If all the above systems are normal, replace the driver
seat control unit.SE-11
The Entry/Exiting does not operate when door is opened
and closed.
(The Entry/Exiting operates with key switch)1. Front door switch circuit inspectionSE-84
2. If all the above systems are normal, replace the BCM.BCS-20
Only door mirror system does not operate (only manual
operation).1.Door mirror remote control switch ground circuit inspec-
tionSE-77
SymptomDiagnoses / service procedure Refer to
page

TF-1
TRANSFER
D DRIVELINE/AXLE
CONTENTS
C
E
F
G
H
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K
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M
SECTION TF
A
B
TF
Revision: October 20052005 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
Wiring Diagrams and Trouble Diagnosis .................. 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 ......... 17
LINE PRESSURE SWITCH ................................ 18
CLUTCH PRESSURE SWITCH .......................... 18
TRANSFER FLUID TEMPERATURE SENSOR ... 18
TRANSFER CONTROL UNIT ............................. 18
TRANSFER CONTROL DEVICE ........................ 184WD SHIFT SWITCH AND INDICATOR LAMP ... 18
4WD 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 ..................................................... 34
Trouble Diagnosis Chart for Symptoms .................. 34
Transfer Control Unit Input/Output Signal Refer-
ence Values ............................................................ 36
TRANSFER CONTROL UNIT INSPECTION
TABLE ................................................................. 36
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

TF-3
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TF
Revision: October 20052005 QX56 DIAGNOSTIC PROCEDURE ............................. 117
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 ...............................................140
Removal and Installation ......................................140
REMOVAL .........................................................140
INSTALLATION .................................................140
TRANSFER OIL FILTER .........................................141
Removal and Installation ......................................141
REMOVAL .........................................................141
INSTALLATION .................................................141
TRANSFER ASSEMBLY ........................................143
Removal and Installation ......................................143
REMOVAL .........................................................143
INSTALLATION .................................................143
Disassembly and Assembly ..................................144
COMPONENTS .................................................144
DISASSEMBLY .................................................146
INSPECTION AFTER DISASSEMBLY ..............161
ASSEMBLY .......................................................165
SERVICE DATA AND SPECIFICATIONS (SDS) ....181
General Specifications ..........................................181
Inspection and Adjustment ...................................181
CLEARANCE BETWEEN INNER GEAR AND
OUTER GEAR ...................................................181
CLUTCH ............................................................181
PINION GEAR END PLAY ................................181
CLEARANCE BETWEEN SHIFT FORK AND
SLEEVE ............................................................181
SELECTIVE PARTS ..........................................181

TF-4
PRECAUTIONS
Revision: October 20052005 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.
WAR NIN G:

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”.
SEF 2 89 H