air suspension INFINITI QX4 2001 Factory Service Manual

Noise, Vibration and Harshness (NVH)
Troubleshooting
NBAX0034NVH TROUBLESHOOTING CHARTNBAX0034S01Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference pageÐ
AX-12
Ð
AX-6, 19
Ð
AX-4, 18
PD-3
PD-3
Refer to DRIVE SHAFT
in this chart.
Refer to AXLE
in this chart.
SU-3
SU-3
SU-3
BR-6
ST-6
Possible cause and
SUSPECTED PARTS
Excessive joint angle
Joint sliding resistance
Imbalance
Improper installation, looseness
Parts interference
Wheel bearing damage
PROPELLER SHAFT
DIFFERENTIAL
DRIVE SHAFT
AXLE
SUSPENSION
TIRES
ROAD WHEEL
BRAKES
STEERING
SymptomDRIVE SHAFTNoise, Vibration´´ ´´ ´ ´´´´´
Shake´ ´ ´ ´ ´´´´´
AXLENoise´´ ´´ ´ ´´´´´
Shake´´ ´ ´ ´´´´´
Vibration´´ ´ ´ ´´ ´
Shimmy´´ ´´´´´
Judder´ ´´´´´
Poor quality ride or
handling´´´ ´´´
´: Applicable
SMA525A
On-vehicle Service
FRONT AXLE PARTSNBAX0004Check front axle parts for excessive play, cracks, wear and other
damage.
1. Shake each front wheel to check for excessive play.
2. Retighten all nuts and bolts to the specified torque.
Tightening torque:
Refer to ªWheel Hub and Rotor Discº, AX-6.
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FRONT AXLE
Noise, Vibration and Harshness (NVH) Troubleshooting
AX-3

NBBR0085
NVH Troubleshooting ChartNBBR0085S01Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
BR-22, 28
BR-22, 28
BR-26
BR-22
Ð
Ð
BR-24, 28
Ð
Ð
Ð
BR-25
BR-28
PD-3
PD-3
AX-3
AX-3
SU-3
SU-3
SU-3
ST-6
Possible cause and
SUSPECTED PARTS
Linings or pads - damaged
Linings or pads - uneven wear
Return spring damaged
Shims damaged
Rotor or drum imbalance
Rotor or drum damage
Rotor or drum runout
Rotor or drum deformation
Rotor or drum deflection
Rotor or drum rust
Rotor thickness variation
Drum out of round
PROPELLER SHAFT
DIFFERENTIAL
DRIVE SHAFT
AXLE
SUSPENSION
TIRES
ROAD WHEEL
STEERING
Symptom BRAKENoise´´´´ ´´´´´´´´
Shake´ ´ ´´´´´´
Shimmy, Judder´´´´´´´´ ´´´´´
´: Applicable
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting Chart
BR-6

SEM439G
SEM440G
17. Install RH and LH rocker covers.
Rocker cover tightening procedure:
ITighten in numerical order as shown in the figure.
a. Tighten bolts 1 to 10 in that order to 6.9 to 8.8 N´m (0.7 to 0.9
kg-m, 61 to 78 in-lb).
b. Then tighten bolts 1 to 10 as indicated in figure to 6.9 to 8.8
N´m (0.7 to 0.9 kg-m, 61 to 78 in-lb).
18. Hang engine using the right and left side engine slingers with
a suitable hoist.
19. Set a suitable transmission jack under the suspension mem-
ber.
20. Remove right and left side engine mounting nuts.
21. Remove right and left side suspension member bolts.
22. Install aluminum oil pan. Refer to EM-18, ªInstallationº.
23. Set ring gear stopper using the mounting bolt hole.
IBe careful not to damage the signal plate teeth.
SEM417G
24. Install crankshaft pulley to crankshaft.
IAlign pointer with TDC mark on crankshaft pulley.
SEM531G
25. Install crankshaft pulley bolt.
ILubricate thread and seat surface of the bolt with new
engine oil.
a. Tighten to 39 to 49 N´m (4.0 to 5.0 kg-m, 29 to 36 ft-lb).
b. Put a paint mark on the crankshaft pulley.
SEM963E
c. Again tighten by turning 60É to 66É, about the angle from one
hexagon bolt head corner to another.
26. Install camshaft position sensor (PHASE), crankshaft position
sensors (REF)/(POS) and CVTC sensors.
27. Reinstall removed parts in the reverse order of removal.
IWhen installing fuel tube and intake manifold collectors, refer
to EM-12, ªTIGHTENING PROCEDURESº.
IAfter starting engine, keep idling for three minutes. Then
rev engine up to 3,000 rpm under no load to purge air from
the high-pressure chamber of the chain tensioners. The
engine may produce a rattling noise. This indicates that
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TIMING CHAIN
Installation (Cont'd)
EM-33

Rear Engine MountingNBEM0042S0102
SEM459G
SEM605G
SEM461G
SEM324F
1. Release fuel pressure.
Refer to EC-39, ªFuel pressure releaseº.
2. Remove engine hood and front RH and LH wheels.
3. Remove engine undercover and suspension member stay.
4. Drain coolant from radiator.
5. Remove the following parts.
IRadiator shroud
IRadiator
ICooling fan
IDrive belts
IBattery
IEngine cover
IThrottle wires
6. Air duct with air cleaner case.
7. Disconnect vacuum hoses, fuel hoses, heater hoses, EVAP
canister hoses, harnesses, connectors and so on.
8. Remove air conditioner compressor from bracket, then put it
aside holding with a suitable wire.
9. Remove power steering oil pump and reservoir tank with
bracket, then put it aside holding with a suitable wire.
10. Remove alternator.
11. Remove exhaust front tube heat insulators, then remove rear
heated oxygen sensors.
12. Remove exhaust front and rear tubes.
Refer to FE-8, ªRemoval and Installationº.
13. Remove transmission with transfer.
Refer to AT-277, ªRemovalº.
14. Remove TWC (manifold) heat insulators, then remove TWC
(manifold).
15. Install engine slingers.
16. Hoist engine with engine slingers and remove front engine
mounting nuts.
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ENGINE ASSEMBLY
Removal and Installation (Cont'd)
EM-59

Propeller shaft greasing .................................MA-23
Propeller shaft inspection ..............................MA-23
Propeller shaft on vehicle service ....................PD-6
Propeller shaft vibration ...................................PD-6
PST/SW - Wiring diagram ............................EC-635
R
Rack retainer adjustment ..................................ST-8
Radiator ....................................................LC-19, 21
Radio - See Audio.........................................EL-160
Rear air spoiler ...............................................BT-35
Rear axle ........................................................AX-17
Rear bumper ...................................................BT-15
Rear case (Transfer) .....................................TF-123
Rear combination lamp removal and
installation ...................................................BT-35
Rear cover packing replacement diff. ............PD-16
Rear door ........................................................BT-20
Rear drum brake ............................................BR-26
Rear heated oxygen sensor
(HO2S) .............................EC-247, 257, 267, 277
Rear heated oxygen sensor (HO2S)
heater ........................................................EC-286
Rear seat ........................................................BT-44
Rear seat belt ...................................................RS-5
Rear side window ...........................................BT-55
Rear suspension ............................................SU-15
Rear washer..................................................EL-141
Rear window defogger ..................................EL-151
Rear wiper.....................................................EL-141
REF - Wiring diagram ..................................EC-510
Refregerant pressure sensor ........................HA-111
Refrigerant connection precaution ...................HA-4
Refrigerant discharging evacuating
charging ....................................................HA-144
Refrigerant general precaution.........................HA-3
Refrigerant lines ...........................................HA-154
Refrigerant pressure sensor.........................EC-639
Refrigeration cycle..........................................HA-14
REMOTE - Wiring diagram ...........................EL-168
Removal and installation (A/T) ......................AT-277
Removal and installation (Transfer) ..............TF-119
Reverse clutch...............................................AT-314
Revolution sensor (A/T).................................AT-115
Ring gear diff. inspection .........................PD-23, 47
RO2H-L - Wiring diagram.............................EC-290
RO2H-R - Wiring diagram ............................EC-289
Road wheel size ..............................................GI-44
Roof trim .........................................................BT-32
Room lamp - See Interior lamp ......................EL-88
RRO2LH - Wiring diagram...EC-251, 261, 271, 281
RRO2RH - Wiring diagram ..EC-250, 260, 270, 280
S
SAE J1930 terminology list .............................GI-51
Screw jack .......................................................GI-45Seal - See Exterior .........................................BT-35
SEAT - Wiring diagram .................................EL-181
Seat belt inspection .............................MA-28, RS-7
Seat belt pre-tensioner .....................................RS-3
Seat belt pre-tensioner disposal ....................RS-22
Seat belt, front ..................................................RS-4
Seat belt, rear...................................................RS-5
Seat, front .......................................................BT-41
Seat, rear ........................................................BT-44
Self-diagnosis (Transfer) .................................TF-27
SHIFT - Wiring diagram ................................AT-266
Shift lock system ...........................................AT-265
Shift schedule ................................................AT-356
Shift solenoid valve A (A/T) ..AT-125, 137, 147, 171
Shift solenoid valve B (A/T) ..AT-125, 131, 147, 175
Shock absorber (rear) ....................................SU-18
Side air bag ....................................................RS-21
Side bearing preload (front final drive
4WD) ...........................................................PD-24
Side trim ..........................................................BT-28
Side window - See Rear side window ............BT-55
Smart entrance control unit ..........................EL-319
SMJ (super multiple junction) .......................Foldout
Spare tire size .................................................GI-44
Spark plug replacement .................................MA-19
Speedometer...................................................EL-94
Spiral cable.....................................................RS-17
Spot lamp ........................................................EL-88
Spring (Wheelarch) height ...............................SU-5
SROOF - Wiring diagram .............................EL-174
SRS - See Supplemental Restraint
System ........................................................RS-10
SRS - Wiring diagram ....................................RS-35
S/SIG - Wiring diagram ................................EC-622
Stabilizer bar (front)........................................SU-10
Stabilizer bar (rear) ........................................SU-20
Stall test (A/T) .................................................AT-59
Standardized relay ............................................EL-7
START - Wiring diagram.................................SC-11
Start signal ...................................................EC-621
Starter .............................................................SC-18
Starting system...............................................SC-10
Steering gear, linkage and transfer
gear inspection ...........................................MA-26
Steering linkage ..............................................ST-17
Steering switch................................................EL-30
Steering transfer gear .....................................ST-15
Steering wheel and column.............................ST-11
Steering wheel play ..........................................ST-7
Steering wheel turning force .............................ST-9
Stop lamp ........................................................EL-67
STOP/L - Wiring diagram................................EL-67
Strut (front) .......................................................SU-8
Sub-oil pump (Transfer) ................................TF-131
Sun gear (Transfer).......................................TF-134
Sun roof, electric ...........................................EL-173
Sunload sensor ............................................HA-135
Sunroof............................................................BT-45
Supplemental Restraint System .....................RS-10
Supplemental restraint system - Wiring
diagram .......................................................RS-35
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ALPHABETICAL INDEX
IDX-7

3. Then check if valve closes at 5ÉC (9ÉF) below valve opening
temperature.
Water Control Valve
REMOVAL AND INSTALLATIONNBLC0032
SLC330B
1. Water outlet housing
2. Water control valve
3. Water outlet4. Water hose
5. Cylinder block water outlet
6. Thermal transmitter7. Engine coolant temperature sen-
sor
1. Release fuel pressure.
Refer to EC-39, ªFuel Pressure Releaseº.
2. Remove under cover.
3. Remove suspension member stay.
4. Drain coolant from radiator.
5. Remove engine cover.
6. Remove air duct with air cleaner assembly.
7. Disconnect wires, hoses, harness and so on.
8. Remove upper intake manifold corrector.
9. Remove intake manifold corrector support bolts.
10. Remove lower intake manifold corrector.
11. Disconnect injector harness connectors.
12. Remove injector tube.
13. Remove intake manifold.
14. Remove water outlet housing and water control valve.
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ENGINE COOLING SYSTEM
Thermostat (Cont'd)
LC-17

Radiator
REMOVAL AND INSTALLATION=NBLC00231. Remove under cover.
2. Remove suspension member stay.
3. Drain coolant from radiator.
4. Disconnect radiator upper and lower hoses.
5. Remove upper and lower radiator shroud.
6. Remove A/T oil cooler hoses.
7. Disconnect reservoir tank hose.
8. Remove radiator mounting bracket.
9. Remove radiator.
10. After repairing or replacing radiator, install any part removed in reverse order of removal.
When filling radiator with coolant, refer to MA-14, ªChanging Engine Coolantº.
SLC331B
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ENGINE COOLING SYSTEM
Radiator
LC-19

CHASSIS AND BODY MAINTENANCENBMA0004S0102
Abbreviations: R = Replace. I = Inspect. Correct or replace if necessary. L = Lubricate
MAINTENANCE OPERATIONMAINTENANCE INTERVAL
Reference
Section
- Page or
- Content Title Perform at number of miles, kilo-
meters or months, whichever
comes first.Miles x 1,000
(km x 1,000)
Months3.75
(6)
37.5
(12)
611.25
(18)
915
(24)
1218.75
(30)
1522.5
(36)
1826.25
(42)
2130
(48)
2433.75
(54)
2737.5
(60)
3041.25
(66)
3345
(72)
3648.75
(78)
3952.5
(84)
4256.25
(90)
4560
(96)
48
Brake lines & cables I I I I MA-25
Brake pads, rotors, drums & linings I IIIIIIIMA-25, 26
Automatic transmission & all-mode
4WD transfer fluid & differential
gear oil (exc. LSD)NOTE (1) I I I I MA-21, 22, 23
LSD gear oil NOTE (1) I R I R MA-24
Steering gear, linkage & transfer
gear, axle & suspension partsIIIIIIIIMA-26
NOTE (6)
Tire rotation NOTE (2)MA-4
Drive shaft boots (
) IIIIIIIIAX-10, ªDrive
Shaftº
Propeller shaft NOTE (3) L LLLLLLLMA-23
Front wheel bearing grease (4x2) I I
Front wheel bearing
grease (
)NOTE (4) I R I RAX-4, ªFront
Wheel Bearingº
Exhaust system I IIIIIIIMA-21
Supplemental air bag systems NOTE (5)RS-14, ªMainte-
nance Itemsº
Ventilation air filter I RIRIRIRHA-159, ªVentila-
tion Air Filterº
ASCD vacuum hoses I I I IEL-237, ªASCD
ACTUATOR/
PUMP CHECKº
NOTE:
(1) If towing a trailer, using a camper or a car-top carrier, or driving on rough or muddy roads, change (not just inspect) fluid (A/T, all mode 4WD transfer)/differential gear oil (exc.
LSD) at every 30,000 miles (48,000 km) or 24 months, and change LSD gear oil every 15,000 miles (24,000 km) or 12 months.
(2) Refer to ªTire rotationº under the ªGENERAL MAINTENANCEº heading earlier in this section.
(3) The propeller shaft should be re-greased after being immersed in water.
(4) If operating frequently in water, replace grease every 3,750 miles (6,000 km) or 3 months.
(5) Inspect the air bag system 10 years after the date of manufacture noted on the FMVSS certification label.
(6) Refer to SU-5, ªFront Suspension Partsº and SU-16, ªRear Suspension Partsº, AX-3, ªFront Axle Partsº and AX-18, ªRear Axle Partsº.
PERIODIC MAINTENANCE
Schedule 1 (Cont'd)
MA-8

CHASSIS AND BODY MAINTENANCENBMA0004S0202
Abbreviations: R = Replace. I = Inspect. Correct or replace if necessary. L = Lubricate
MAINTENANCE OPERATIONMAINTENANCE INTERVAL
Reference Section
- Page
or
- Content Title Perform at number of miles, kilometers
or months, whichever comes first.Miles x 1,000
(km x 1,000)
Months7.5
(12)
615
(24)
1222.5
(36)
1830
(48)
2437.5
(60)
3045
(72)
3652.5
(84)
4260
(96)
48
Brake lines & cablesIIIIMA-25
Brake pads, rotors, drums & liningsIIIIMA-25, 26
Automatic transmission & all-mode 4WD
transfer fluid & differential gear oil (exc.
LSD)IIIIMA-21, 22, 23
LSD gear oilIRIRMA-24
Steering gear, linkage & transfer gear,
axle & suspension partsIIMA-26
NOTE (4)
Tire rotation NOTE (1)MA-4
Drive shaft boots (
) IIIIAX-10, ªDrive shaftº
Propeller shaft NOTE (2)LLLLMA-23
Front wheel bearing grease (4x2) I I
Front wheel bearing grease (
) IRIRAX-4, ªFront Wheel
Bearingº
Exhaust systemI I MA-21
Supplemental air bag systems NOTE (3)RS-14, ªMaintenance
Itemº
Ventilation air filterRRRRHA-159, ªVentilation Air
Filterº
ASCD vacuum hosesIIIIEL-237, ªASCD
ACTUATOR/PUMP
CHECKº
NOTE:
(1) Refer to ªTire rotationº under the ªGENERAL MAINTENANCEº heading earlier in this section.
(2) The propeller shaft should be re-greased after being immersed in water.
(3) Inspect the air bag system 10 years after the date of manufacture noted on the FMVSS certification label.
(4) Refer to SU-5, ªFront Suspension Partsº and SU-16, ªRear Suspension Partsº, AX-3, ªFront Axle Partsº and AX-18, ªRear Axle Partsº.
PERIODIC MAINTENANCE
Schedule 2 (Cont'd)
MA-10

Noise, Vibration and Harshness (NVH)
Troubleshooting
=NBPD0049NVH TROUBLESHOOTING CHARTNBPD0049S01Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference pageÐ
Ð
Ð
Ð
PD-6
PD-6
PD-23, 47
PD-29, 56
PD-23, 47
PD-18, 43
Ð
Ð
Ð
Ð
AX-3
AX-3
SU-3
SU-3
SU-3
BR-6
ST-6
Possible cause and
SUSPECTED PARTS
Uneven rotation torque
Excessive center bearing axial end play
Center bearing mounting (insulator) cracks, damage or deterioration
Excessive joint angle
Rotation imbalance
Excessive runout
Rough gear tooth
Improper gear contact
Tooth surfaces worn
Incorrect backlash
Companion flange excessive runout
Improper gear oil
PROPELLER SHAFT
DIFFERENTIAL
DRIVE SHAFT
AXLE
SUSPENSION
TIRES
ROAD WHEEL
BRAKES
STEERING
SymptomPROPEL-
LER
SHAFTNoise´´´´´´ ´´´´´´´´
Shake´ ´´´´´´´
Vibration´´´´´´ ´´´´ ´
DIFFER-
ENTIALNoise´´´´´´´ ´´´´´´´
´: Applicable
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PROPELLER SHAFT
Noise, Vibration and Harshness (NVH) Troubleshooting
PD-3