INSTALLATION INFINITI QX4 2001 Factory Service Manual

SBR686C
Removal and InstallationNBSU00261. Support axle and suspension components with a suitable jack
and block.
2. Disconnect brake hydraulic line and parking brake cables at
back plates.
CAUTION:
IUse flare nut wrench when removing and installing brake
tubes.
IBefore removing the rear suspension assembly, discon-
nect the ABS wheel sensor from the assembly. Then move
it away from the rear suspension assembly. Failure to do
so may result in damage to the sensor wires and the sen-
sor becoming inoperative.
3. Remove stabilizer bar from body.
4. Remove upper links and lower links from body.
5. Remove panhard rod from body.
6. Disconnect rear end of propeller shaft. Refer to PD-6,
ªRemoval and Installationº.
7. Remove upper end nuts of shock absorber.
SRA935
Final tightening for rubber parts requires to be carried out
under unladen condition with tires on ground.
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REAR SUSPENSION
Removal and Installation
SU-17

SRA645A
REMOVAL AND INSTALLATIONNBSU0028Refer to ªRemoval and Installationº, ªREAR SUSPENSIONº,
SU-17.
When installing coil spring, pay attention to its direction.
Be sure spring rubber seat is not twisted and has not slipped
off when installing coil spring.
INSPECTIONNBSU0029ICheck coil spring for yield, deformation and cracks.
ICheck shock absorber for oil leakage, cracks and deformation.
ICheck all rubber parts for wear, cracks and deformation.
Replace if necessary.
Upper Link, Lower Link and Panhard Rod
INSPECTIONNBSU0030Check for cracks, distortion and other damage. Replace if
necessary.
SRA898
BUSHING REPLACEMENTNBSU0031Check for cracks and other damage. Replace with suitable tool if
necessary.
IRemove bushing with suitable tool.
SRA900
When installing bushing, apply a coat of 1% soapy water to
outer wall of bushing.
Always install new bushing.
Do not tap end face of bushing directly with a hammer.
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REAR SUSPENSION
Coil Spring and Shock Absorber (Cont'd)
SU-19

INSTALLATIONNBSU0032When installing each link, pay attention to direction of nuts
and bolts.
When installing each rubber part, final tightening must be car-
ried out under unladen condition with tires on ground.
SRA766A
Stabilizer Bar
REMOVAL AND INSTALLATIONNBSU0033IWhen removing and installing stabilizer bar, fix portion A.
SFA449BA
IInstall stabilizer bar with ball joint socket properly placed.
Service Data and Specifications (SDS)
GENERAL SPECIFICATIONS (REAR)NBSU0034
Suspension type5-link type rigid with coil spring
Shock absorber typeDouble-acting hydraulic
StabilizerStandard equipment
REAR SUSPENSION
Upper Link, Lower Link and Panhard Rod (Cont'd)
SU-20

TRANSFER
SECTION
TF
CONTENTS
PRECAUTIONS...............................................................3
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER²...............3
Precautions ..................................................................3
Service Notice..............................................................4
Wiring Diagrams and Trouble Diagnosis .....................4
PREPARATION...............................................................5
Special Service Tools ..................................................5
Commercial Service Tools ...........................................9
ALL-MODE 4WD SYSTEM...........................................10
Cross-sectional View .................................................10
Control System .......................................................... 11
ALL-MODE 4WD TRANSFER BASIC CONTROL........12
HYDRAULIC CONTROL CIRCUITS...........................12
OUTLINE................................................................12
CONTROL SYSTEM DIAGRAM................................13
INDICATIONS OF 4WD WARNING LAMP..................13
Location of Electrical Parts ........................................14
Description of Electrical Parts ...................................15
TRANSFER MOTOR................................................15
WAIT DETECTION SWITCH.....................................15
2-4WD SHIFT SOLENOID VALVE.............................16
LINE PRESSURE SWITCH.......................................16
Circuit Diagram for Quick Pinpoint Check.................17
Wiring Diagram - TF -................................................18
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION...............................................................27
Trouble Diagnosis without CONSULT-II ....................27
DESCRIPTION........................................................27
SELF-DIAGNOSTIC PROCEDURE............................28
INDICATIONS OF 4WD WARNING LAMP..................29
Trouble Diagnosis with CONSULT-II .........................30
SELF-DIAGNOSIS...................................................30
SELF-DIAGNOSTIC ITEMS......................................31
DATA MONITOR......................................................33
DATA MONITOR ITEMS...........................................34
REFERENCE VALUE IN DATA MONITOR MODE......36
WORK SUPPORT....................................................38
CLUTCH FORCE RELEASE LIMIT ADJUSTMENT.....39
TROUBLE DIAGNOSIS - INTRODUCTION..................41Introduction ................................................................41
DESCRIPTION........................................................41
DIAGNOSTIC WORKSHEET.....................................41
Work Flow ..................................................................43
HOW TO PERFORM TROUBLE DIAGNOSES FOR
QUICK AND ACCURATE REPAIR
.............................43
TROUBLE DIAGNOSIS - BASIC INSPECTION...........44
Listen to Customer Complaints .................................44
Transfer Fluid Check .................................................44
Road Test...................................................................44
PREPARATION FOR ROAD TEST............................44
1. CHECK BEFORE ENGINE IS STARTED...............45
2. CHECK AT IDLE..................................................47
3. CRUISE TEST.....................................................51
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION...............................................................54
Transfer Control Unit Terminals and Reference
Value ..........................................................................54
REMOVAL AND INSTALLATION OF TRANSFER
CONTROL UNIT
......................................................54
INSPECTION OF TRANSFER CONTROL UNIT..........54
TRANSFER CONTROL UNIT INSPECTION TABLE....55
VEHICLE SPEED SENSOR (FRONT
REVOLUTION SENSOR)..............................................61
Diagnostic Procedure ................................................61
4WD SOLENOID VALVE...............................................64
Diagnostic Procedure ................................................64
2-4WD SHIFT SOLENOID VALVE AND 4WD
SHIFT SWITCH..............................................................66
Diagnostic Procedure ................................................66
TRANSFER MOTOR AND TRANSFER MOTOR
RELAY...........................................................................70
Diagnostic Procedure ................................................70
TRANSFER FLUID TEMPERATURE SENSOR............73
Diagnostic Procedure ................................................73
ATP SWITCH, WAIT DETECTION SWITCH AND
NEUTRAL-4LO SWITCH...............................................76
Diagnostic Procedure ................................................76
CLUTCH PRESSURE SWITCH....................................80
Diagnostic Procedure ................................................80
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LINE PRESSURE SWITCH...........................................83
Diagnostic Procedure ................................................83
ABS OPERATION SIGNAL...........................................86
Diagnostic Procedure ................................................86
DATA ERASE/DISPLAY...............................................88
Diagnostic Procedure ................................................88
SHIFT ACTUATOR........................................................89
Diagnostic Procedure ................................................89
SHIFT ACTUATOR POSITION SWITCH......................92
Diagnostic Procedure ................................................92
SHIFT ACTUATOR CIRCUIT........................................94
Diagnostic Procedure ................................................94
TROUBLE DIAGNOSES FOR SYMPTOMS.................98
Symptom 1. 4WD Shift Indicator Lamp Does Not
Turn ON .....................................................................98
Symptom 2. 4WD Warning Lamp Does Not Turn
ON............................................................................100
Symptom 3. 4WD Shift Indicator Lamp Does Not
Turn OFF .................................................................102
Symptom 4. ATP Warning Lamp Does Not Turn
ON............................................................................102
Symptom 5. 4LO Indicator Lamp Does Not Turn
ON............................................................................104
Symptom 6. 4WD Shift Indicator Lamp Does Not
Indicate²4H²............................................................106
Symptom 7. 4WD Shift Indicator Lamp Repeats
Flickering..................................................................107
Symptom 8. Tight Corner Braking Symptom...........108
Symptom 9. 4WD System Does Not Operate.........109
COMPONENT INSPECTION....................................... 111
4WD Shift Switch ..................................................... 111
2-4WD Shift Solenoid Valve and Transfer Fluid
Temperature Sensor ................................................ 111
4WD Solenoid Valve, Clutch Pressure Switch
and Line Pressure Switch........................................ 111
Front Revolution Sensor .......................................... 112
Transfer Dropping Resistor...................................... 112
ATP Switch, Neutral-4LO Switch and Wait
Detection Switch ...................................................... 112
Transfer Motor ......................................................... 113
Transfer Motor Relay ............................................... 113
Transfer Sub-harness .............................................. 113
FRONT REVOLUTION SENSOR SUB-HARNESS
CONNECTOR
........................................................ 113
TRANSFER SWITCH ASSEMBLY SUB-HARNESS
CONNECTOR
........................................................ 114
TRANSFER TERMINAL CORD ASSEMBLY SUB-
HARNESS CONNECTOR
....................................... 114
Transfer Shift Relay (High & low) ............................ 114
Actuator & Actuator Position Switch ........................ 115
ACTUATOR........................................................... 115
ACTUATOR POSITION SWITCH............................ 115
ON-VEHICLE SERVICE.............................................. 116
Replacing Oil Seal ................................................... 116
FRONT CASE OIL SEAL........................................ 116
SHIFT SHAFT OIL SEAL........................................ 117
REAR OIL SEAL.................................................... 117
Transfer Motor ......................................................... 117
REMOVAL............................................................. 117
INSTALLATION...................................................... 117
Transfer Oil Filter ..................................................... 118
REMOVAL............................................................. 118
INSTALLATION...................................................... 118
REMOVAL AND INSTALLATION............................... 119
Removal ................................................................... 119
Installation ................................................................ 119
OVERHAUL.................................................................120
Transfer Gear Control ..............................................120
Transfer Components ..............................................121
DISASSEMBLY............................................................123
Rear Case................................................................123
DISASSEMBLY......................................................123
Center Case.............................................................123
DISASSEMBLY......................................................123
Front Case ...............................................................133
DISASSEMBLY......................................................133
REPAIR FOR COMPONENT PARTS.........................137
Front Case ...............................................................137
INSPECTION.........................................................137
Center Case.............................................................138
INSPECTION.........................................................138
ASSEMBLY..................................................................141
Front Case ...............................................................141
ASSEMBLY...........................................................141
Center Case.............................................................145
ASSEMBLY...........................................................145
Final Assembly.........................................................153
SERVICE DATA AND SPECIFICATIONS (SDS).......157
General Specifications .............................................157
Inner Gear and Outer Gear .....................................157
SUB-OIL PUMP.....................................................157
MAIN OIL PUMP....................................................157
Control Valve ...........................................................157
VALVE..................................................................157
SPRING................................................................157
Clutch .......................................................................158
DRIVE PLATE.......................................................158
DRIVEN PLATE.....................................................158
RETURN SPRING..................................................158
RETAINING PLATE................................................158
Seal Ring (Mainshaft side) ......................................159
Bearing Race (Thrust needle bearing side) ............159
Snap Ring (Sun gear side) ......................................159
CONTENTS(Cont'd)
TF-2

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NBTF0001The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
IFor a side collision
The Supplemental Restraint System consists of side air bag module (located in the outer side of front seat),
satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring harness,
warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRSsection of this Service Manual.
WARNING:
ITo avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed
by an authorized INFINITI dealer.
IImproper 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 RS section.
IDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
SEF289H
PrecautionsNBTF0092IBefore connecting or disconnecting the Transfer control
unit harness connector, turn ignition switch OFF and dis-
connect negative battery terminal. Failure to do so may
damage the Transfer control unit. Because battery voltage
is applied to Transfer control unit even if ignition switch
is turned off.
SEF291H
IWhen connecting or disconnecting pin connectors into or
from Transfer control unit, take care not to damage pin
terminals (bend or break).
Make sure that there are not any bends or breaks on
Transfer control unit pin terminal, when connecting pin
connectors.
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PRECAUTIONS
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
TF-3

SMT862D
Transfer Control Unit Terminals and Reference
Value
NBTF0018REMOVAL AND INSTALLATION OF TRANSFER
CONTROL UNIT
NBTF0018S03RemovalNBTF0018S03011. Turn ignition switch OFF and disconnect negative battery ter-
minal.
2. Remove console box.
3. Remove cluster lid C.
4. Remove audio assembly and A/C control unit.
5. Remove instrument lower panel on driver side.
6. Remove glove box.
7. Remove instrument lower panel on passenger side.
8. Remove instrument lower center panel.
9. Remove transfer control unit.
IFor steps 2 through 8 above, refer to BT-21, ªInstrument Panel
Assemblyº.
InstallationNBTF0018S0302IInstallation is in the reverse order of removal.
When installing transfer control unit, tighten transfer control unit
lock nut.
Tightening torque:
: 4.3 - 5.8 N´m (0.44 - 0.59 kg-m, 38 - 51 in-lb)
SMT771D
INSPECTION OF TRANSFER CONTROL UNITNBTF0018S01IMeasure voltage between each terminal and terminal 6 or 45
by following ªTRANSFER CONTROL UNIT INSPECTION
TABLEº, TF-55.
IPin connector terminal layout
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value
TF-54

SMT844DB
Replacing Oil SealNBTF0068FRONT CASE OIL SEALNBTF0068S011. Drain transfer fluid.
2. Remove exhaust front tube and heat insulator. Refer to
ªRemovalº, TF-119.
3. Remove front propeller shaft. Refer to PD-6, ªRemoval and
Installationº.
4. Remove companion flange lock nut.
IDo not reuse lock nut.
SMT112D
5. Put a matchmark on top of drive pinion thread. The mark
should be in line with the mark on the companion flange.
IAlways mark top of drive pinion screw using paint.
SMT802C
6. Remove companion flange.
SMT803C
7. Remove front case oil seal.
8. Install front case oil seal.
IBefore installing, apply multi-purpose grease to seal lip.
9. Install companion flange.
SMT845DB
10. Tighten nut to the specified torque.
Refer to TF-121.
11. Install front propeller shaft.
ON-VEHICLE SERVICE
Replacing Oil Seal
TF-116

SMT808D
SHIFT SHAFT OIL SEALNBTF0068S021. Remove front propeller shaft. Refer to PD-6, ªRemoval and
Installationº.
2. Remove companion flange. Refer to ªFRONT CASE OIL
SEALº, TF-116.
3. Remove actuator lever from transfer outer shift lever. Then
remove outer shift lever.
SMT491A
4. Remove shift shaft oil seal.
IBe careful not to damage cross shaft.
SMT805C
5. Install shift shaft oil seal.
IBefore installing, apply multi-purpose grease to seal lip.
6. Install transfer control linkage.
7. Install companion flange. Refer to ªFRONT CASE OIL SEALº,
TF-116.
8. Install front propeller shaft.
SMT892C
REAR OIL SEALNBTF0068S031. Remove rear propeller shaft. Refer to PD-6, ªRemoval and
Installationº.
2. Remove rear oil seal.
3. Install rear oil seal.
IBefore installing, apply multi-purpose grease to seal lip.
4. Install rear propeller shaft.
SMT874C
Transfer Motor
REMOVALNBTF00691. Disconnect transfer motor harness connector.
2. Remove breather pipe from transfer motor.
3. Remove bolts to detach transfer motor.
IAfter removing transfer motor, be sure to replace O-ring
with new one.
INSTALLATIONNBTF00701. Apply petroleum jelly or ATF to O-ring.
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ON-VEHICLE SERVICE
Replacing Oil Seal (Cont'd)
TF-117

2. Align width across flat-notch with oil pump groove, and install
transfer motor.
3. Tighten bolts.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
4. Install breather pipe to transfer motor.
5. Connect transfer motor harness connector.
SMT875C
Transfer Oil Filter
REMOVALNBTF0071IRemove bolts to detach oil filter.
IWhen removing oil filter from transfer, avoid damaging it.
Be sure to loosen bolts evenly.
IWhen removing oil filter, be sure to replace O-ring with
new one.
INSTALLATIONNBTF00721. Apply petroleum jelly or ATF to O-ring.
2. Tighten bolts evenly to install oil filter.
:7-9N´m(0.7 - 0.9 kg-m, 61 - 78 in-lb)
IBe sure not to damage oil filter.
ON-VEHICLE SERVICE
Transfer Motor (Cont'd)
TF-118