sensor INFINITI QX56 2004 Factory Service Manual

PG-62
HARNESS
Revision: August 20072004 QX56
HSEAT SE Heated Seat
IATS EC Intake Air Temperature Sensor
ICC ACS Intelligent Cruise Control
ICCBOF EC ICC Brake Switch
ICC/BS EC ICC Steering Switch
ICC/SW EC ICC Brake Switch
I/MIRR GW Inside Mirror (Auto Anti-Dazzling Mirror)
IGNSYS EC Ignition System
ILL LT Illumination
INJECT EC Injector
INT/L LT Room/Map, Vanity, Cargo, Personal, Foot, Step, and Puddle Lamps
KEYLES BL Remote Keyless Entry System
KS EC Knock Sensor
MAFS EC Mass Air Flow Sensor
MAIN EC Main Power Supply and Ground Circuit
METER DI Speedometer, Tachometer, Temp. and Fuel Gauges
MIL/DL EC Malfunction Indicator Lamp
MIRROR GW Door Mirror
NATS BL Nissan Anti-Theft System
NAVI AV Navigation System
O2H2B1 EC Rear Heated Oxygen Sensor 2 Heater Bank 1
O2H2B2 EC Rear Heated Oxygen Sensor 2 Heater Bank 2
O2S2B1 EC Heated Oxygen Sensor 2 Bank 1
O2S2B2 EC Heated Oxygen Sensor 2 Bank 2
P/SCKT WW Power Socket
PGC/V EC EVAP Canister Purge Volume Control Solenoid Valve
PHASE EC Camshaft Position Sensor (PHASE) (Bank 1)
PNP/SW EC Park/Neutral Position Switch
POS EC Crankshaft Position Sensor (POS)
POWER PG Power Supply Routing
PRE/SE EC EVAP Control System Pressure Sensor
PS/SEN EC Power Steering Pressure Sensor
R/VIEW DI Rear View Monitor
RP/SEN EC Refrigerant Pressure Sensor
SEAT SE Power Seat (Without Memory)
SEN/PW EC Sensor Power Supply
SHIFT AT A/T Shift Lock System
SONAR DI Rear Sonar System
SROOF RF Sunroof
SRS SRS Supplemental Restraint System
START SC Starting System
STOP/L LT Stop Lamp
T/TOW LT Trailer Tow
T/WARN WT Low Tire Pressure Warning System
TAIL/L LT Parking, License and Tail Lamps
T/F TF Transfer Case
TPS1 EC Throttle Position Sensor
TPS2 EC Throttle Position Sensor
TPS3 EC Throttle Position Sensor
TRNSCV BL HOMELINK® Universal Transceiver
TURN LT Turn Signal and Hazard Warning Lamps
VDC BRC Vehicle Dynamic Control System

PS-1
POWER STEERING SYSTEM
G STEERING
CONTENTS
C
D
E
F
H
I
J
K
L
M
SECTION PS
A
B
PS
Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
Precautions for Steering System .............................. 2
PREPARATION ........................................................... 3
Special Service Tools (SST) ..................................... 3
Commercial Service Tools ........................................ 4
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 5
NVH Troubleshooting Chart ..................................... 5
POWER STEERING FLUID ........................................ 6
Checking Fluid Level ................................................ 6
Checking Fluid Leakage ........................................... 6
Air Bleeding Hydraulic System ................................. 6
STEERING WHEEL .................................................... 7
On-Vehicle Inspection and Service .......................... 7
CHECKING CONDITION OF INSTALLATION ...... 7
CHECKING STEERING WHEEL PLAY ................ 7
CHECKING NEUTRAL POSITION ON STEER-
ING WHEEL .......................................................... 7
CHECKING STEERING WHEEL TURNING
FORCE .................................................................. 7
CHECKING FRONT WHEEL TURNING ANGLE ..... 7
Removal and Installation .......................................... 8
REMOVAL ............................................................. 8
INSTALLATION ..................................................... 8
TILT SYSTEM ............................................................. 9
Removal and Installation .......................................... 9
TILT MOTOR AND TILT SENSOR ........................ 9
STEERING COLUMN ............................................... 10
Removal and Installation ........................................ 10
REMOVAL ........................................................... 10
INSPECTION AFTER REMOVAL ........................11
INSTALLATION ....................................................11INSPECTION AFTER INSTALLATION ................ 12
Disassembly and Assembly .................................... 13
DISASSEMBLY ................................................... 13
ASSEMBLY ......................................................... 14
INSPECTION AFTER ASSEMBLY ...................... 14
POWER STEERING GEAR AND LINKAGE ............ 15
Removal and Installation ........................................ 15
REMOVAL ........................................................... 15
INSTALLATION ................................................... 16
INSPECTION AFTER INSTALLATION ................ 17
Disassembly and Assembly .................................... 17
DISASSEMBLY ................................................... 18
INSPECTION AFTER DISASSEMBLY ................ 20
ASSEMBLY ......................................................... 21
POWER STEERING OIL PUMP ............................... 26
On-Vehicle Inspection and Service ......................... 26
CHECKING RELIEF OIL PRESSURE ................ 26
Removal and Installation ........................................ 26
REMOVAL ........................................................... 26
INSTALLATION ................................................... 26
Disassembly and Assembly .................................... 27
INSPECTION BEFORE DISASSEMBLY ............. 27
DISASSEMBLY ................................................... 27
INSPECTION AFTER DISASSEMBLY ................ 28
ASSEMBLY ......................................................... 28
HYDRAULIC LINE .................................................... 31
Removal and Installation ........................................ 31
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 33
Steering Wheel ....................................................... 33
Steering Column ..................................................... 33
Steering Outer Socket and Inner Socket ................ 34
Steering Gear ......................................................... 35
Oil Pump ................................................................. 35
Steering Fluid .......................................................... 35

TILT SYSTEM
PS-9
C
D
E
F
H
I
J
K
L
MA
B
PS
Revision: August 20072004 QX56
TILT SYSTEMPFP:48810
Removal and InstallationEGS000N8
TILT MOTOR AND TILT SENSOR
Removal
1. Remove the steering column cover and lower driver instrument panel. Refer to IP-10, "INSTRUMENT
PANEL ASSEMBLY" .
2. Remove knee protector.
3. Disconnect the tilt sensor electrical connector.
4. Remove the two tilt sensor screws and the tilt sensor.
5. Disconnect the tilt motor electrical connector.
6. Remove the tilt motor bolt and the tilt motor.
Installation
Installation is in reverse order of removal.
NOTE:
Make sure the tab in the tilt sensor is engaged in the bracket on the tilt motor.
LGIA0022E
1. Tilt sensor 2. Tilt motor
LGIA0026E

PS-10
STEERING COLUMN
Revision: August 20072004 QX56
STEERING COLUMNPFP:48810
Removal and InstallationEGS000NC
CAUTION:

Do not exert any load or impact in the axial direction immediately before or after column removal.

Do not to move steering gear during removal of steering column assembly.
REMOVAL
1. Remove combination switch and spiral cable from steering column assembly. Refer to SRS-47, "Removal
and Installation" .
2. Remove the tilt motor and tilt sensor. Refer to PS-9, "
Removal and Installation" .
3. Remove steering column cover, ADP steering switch and ignition key finisher. Refer to IP-12, "
Removal
and Installation" .
1. Driver air bag module 2. Steering wheel 3. Steering wheel side cover
4. Combination switch and spiral cable 5. Steering column assembly 6. Collar
7. Hole cover seal 8. Clamp 9. Hole cover mounting plate
10. Hole cover 11. Upper joint 12. Upper shaft
13. Boot clamp 14. Lower joint shaft 15. Boot and clips (plastic)
WGIA0106E

PS-16
POWER STEERING GEAR AND LINKAGE
Revision: August 20072004 QX56
7. Remove steering outer socket from steering knuckle using Tool.
Be careful not to damage ball joint boot.
CAUTION:
Temporarily tighten mounting nut to prevent damage to
threads and to prevent Tool from coming off.
8. On 2WD models, remove stabilizer bar mounting bolts and reposition stabilizer bar. Refer to FSU-12,
"STABILIZER BAR" .
9. Remove oil piping (high pressure side and low pressure side)
from steering gear assembly, then drain fluid from piping.
10. Remove lower joint mounting bolt of lower shaft.
11. Remove mounting bolts and nuts of steering gear assembly
using power tool, and then remove steering gear assembly from
vehicle.
INSTALLATION
Installation is in the reverse order of removal.

After removing/installing or replacing steering components, check wheel alignment. Refer to FSU-6,
"Front Wheel Alignment" .

After adjusting wheel alignment, adjust neutral position of steering angle sensor. Refer to BRC-62,
"Adjustment of Steering Angle Sensor Neutral Position" . Tool number : HT72520000 (J-25730-A)
SDIA1434E
LGIA0032E
LGIA0029E
LGIA0024E

PS-26
POWER STEERING OIL PUMP
Revision: August 20072004 QX56
POWER STEERING OIL PUMPPFP:49110
On-Vehicle Inspection and ServiceEGS000MW
CHECKING RELIEF OIL PRESSURE
CAUTION:
Before starting work, confirm belt tension is proper.
1. Connect Tool between oil pump discharge connector and high
pressure hose and then bleed air from the hydraulic circuit.
2. Start engine. Allow engine to run until tank temperature reaches 50 – 80°C (122 – 176°F).
CAUTION:

Warm up engine with shut-off valve fully opened. If engine is started with shut-off valve closed,
fluid pressure in power steering pump increases to maximum. This will raise fluid temperature
excessively.

Be careful not to contact hose with belt when engine is started.
3. With engine at idle, close shut-off valve and read the relief oil pressure.
CAUTION:
Do not close shut-off valve of pressure gauge for more than 10 seconds.
4. After measurement, open shut-off valve slowly.

If relief oil pressure is outside the specification, disassemble and repair oil pump. Refer to PS-17, "Dis-
assembly and Assembly" .
5. After inspection, disconnect oil pressure gauge and oil pressure gauge adapter from hydraulic circuit, con-
nect oil pump discharge connector and high pressure hose. Add fluid and bleed air from hydraulic circuit
thoroughly. Refer to PS-6, "
Air Bleeding Hydraulic System" .
Removal and InstallationEG S0 0 0MX
REMOVAL
1. Drain power steering fluid from reservoir tank.
2. Remove engine room cover. Refer to EM-11, "
Removal and Installation" .
3. Remove air duct assembly. Refer to EM-14, "
Removal and Installation" .
4. Remove power steering reservoir tank.
5. Remove serpentine drive belt belt from auto tensioner and power steering pump. Refer to EM-12,
"Removal and Installation" .
6. Disconnect pressure sensor electrical connector.
7. Remove high pressure and low pressure piping from power steering oil pump. Refer to PS-31, "
HYDRAU-
LIC LINE" .
8. Remove mounting bolts, then remove power steering pump.
INSTALLATION
Installation is in the reverse order of removal. Refer to PS-31, "HYDRAULIC LINE" for tightening torque.

After installation, bleed air. Refer to PS-6, "Air Bleeding Hydraulic System" .
NOTE:
Belt tension is automatic and requires no adjustment.
Tool number:
Pressure gauge and shut-off valveKV48103500
(J26357 and J26357-10)
Oil pump sideConnector A and
O-ringKV48105300-4 and 5295262U10
(—)
Eye-bolt and O-ringKV48105300-3 and 5295262U00
(—)
High pressure
piping sideConnector B and
O-ringKV48105300-1 and 5295262U00
(—)
NutKV48105300-2
( — )
Relief oil pressure
: 9.0 – 9.8 mPa (91.77 – 99.93 kg/cm2 , 1305.34 – 1421.37 psi)
SGIA0570E

POWER STEERING OIL PUMP
PS-27
C
D
E
F
H
I
J
K
L
MA
B
PS
Revision: August 20072004 QX56
Disassembly and AssemblyEGS000MY
INSPECTION BEFORE DISASSEMBLY
Disassemble power steering oil pump only if the following conditions are found.

Oil leakage from oil pump

Deformed or damaged pulley

Poor performance
DISASSEMBLY
CAUTION:
When retaining drive shaft in a vise, always use copper or aluminum plates between vise and shaft.
NOTE:
Mount the oil pump in a vise as needed.
1. Unscrew three bracket bolts and remove bracket from rear cover.
2. Unscrew four rear cover bolts and remove rear cover from body assembly.
3. Remove gasket from body assembly.
4. Remove lock pin, cartridge and side plate from body assembly.
5. Remove pulley from drive shaft assembly.
1. Bracket 2. Rear cover 3. Gasket
4. Lock pin 5. Cam ring 6. Rotor
7. Vane 8. Cartridge 9. Side plate
10. O-ring 11. Body assembly 12. Oil seal
13. Drive shaft assembly 14. Snap ring 15. Pulley
16. Spring washer 17. Flow control valve 18. Pressure sensor
19. Connector bolt 20. Copper washer 21. Bracket
22. Suction pipe 23. O-ring
WGIA0076E

WHEEL HUB
RAX-5
C
E
F
G
H
I
J
K
L
MA
B
RAX
Revision: August 20072004 QX56
WHEEL HUBPFP:43202
On-Vehicle Inspection and ServiceEDS001AT
Inspect the components for any looseness or back lash. Inspect each component for any excessive wear or
damage. Replace any components as necessary.
WHEEL BEARING INSPECTION

Move the wheel hub and bearing assembly in the axial direction by hand to check the axial end play.
Check that the axial end play is with specification. Replace the wheel hub and bearing assembly as nec-
essary.

Rotate the wheel hub and bearing assembly to check that there are no unusual noises or other abnormal
conditions. Replace the wheel hub and bearing assembly as necessary.
Removal and InstallationEDS001AU
Rear Wheel Hub and Bearing Assembly
NOTE:
The rear ABS sensor is routed through the back of the rear backing plate and into the side of the wheel hub
and bearing assembly. It is necessary to remove the wheel hub and bearing assembly to remove the rear ABS
sensor.
REMOVAL
1. Remove the wheel and tire using power tool.
2. Remove the rear brake caliper, without disconnecting the hydraulic hose, using power tool. Reposition the
rear brake caliper aside using suitable wire. Refer to BR-28, "
Removal and Installation of Brake Caliper
Assembly and Disc Rotor" .
NOTE:

Do not depress the brake pedal while the brake caliper is removed.
3. Remove the rear disc rotor.Axial end play : 0 mm (0 in)
WDIA0300E
1. Back plate 2. Rear ABS sensor 3. Wheel hub and bearing assembly
4. Wheel stud 5. Rear disc rotor 6. Cotter pin
⇐: Vehicle front

RAX-6
WHEEL HUB
Revision: August 20072004 QX56
4. Remove the cotter pin, then remove the nut from the drive shaft
using power tool.

Discard the cotter pin, use a new one for installation.
5. Remove the drive shaft. Refer to RAX-7, "
Removal and Installa-
tion" .
6. Remove the four wheel hub and bearing assembly bolts using power tool.

Discard the four wheel hub and bearing assembly bolts, use new ones for installation.
7. Pull out the wheel hub and bearing assembly for access to
remove the rear ABS sensor from the wheel hub and bearing
assembly as shown.

Inspect the ABS sensor O-ring, replace the ABS sensor
assembly if damaged.

Clean the ABS sensor hole and mounting surface with a suit-
able brake cleaner and a clean lint-free shop rag. Be careful
that dirt and debris do not enter the axle bearing area.

Apply a coat of suitable grease to the ABS sensor O-ring and
mounting hole.
CAUTION:
Do not pull on the ABS harness.
8. Remove the wheel hub and bearing assembly.
INSTALLATION
Installation is in the reverse order of removal.

Apply grease 44003 7S000CM to contact surface (A) between
wheel hub and bearing assembly and drive shaft as shown. Use
sufficient grease to completely coat contact area.

Inspect the ABS sensor O-ring, replace the ABS sensor assem-
bly if damaged.

Clean the ABS sensor hole and mounting surface with a suitable
brake cleaner and a clean lint-free shop rag. Be careful that dirt
and debris do not enter the axle bearing area.

Apply a coat of suitable grease to the ABS sensor O-ring and
mounting hole.

Use a new cotter pin for installation.

Use new wheel hub and bearing assembly bolts for installation.
LDIA0050E
LDIA0052E
WDIA0299E

RSU-1
REAR SUSPENSION
E SUSPENSION
CONTENTS
C
D
F
G
H
I
J
K
L
M
SECTION RSU
A
B
RSU
Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Rear Suspension ............................ 3
Wiring Diagrams and Trouble Diagnosis .................. 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 OPERATION .................................. 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