2001 INFINITI QX4 check engine

Diagnostic ProcedureNBAT0095SYMPTOM 1:
ISelector lever cannot be moved from ªPº position with key
in ªONº position and brake pedal applied.
ISelector lever can be moved from ªPº position with key in
ªONº position and brake pedal released.
ISelector lever can be moved from ªPº position when key
is removed from key cylinder.
SYMPTOM 2:
Ignition key cannot be removed when selector lever is set to
ªPº position. It can be removed when selector lever is set to
any position except ªPº.
1 CHECK KEY INTERLOCK CABLE
Check key interlock cable for damage.
OK or NG
OK©GO TO 2.
NG©Repair key interlock cable. Refer to ªKey Interlock Cableº, AT-271.
2 CHECK SELECTOR LEVER POSITION
Check selector lever position for damage.
OK or NG
OK©GO TO 3.
NG©Check selector lever. Refer to ªON-VEHICLE SERVICE Ð PNP Switch and Manual Con-
trol Linkage Adjustmentº, AT-276 and AT-276.
3 CHECK POWER SOURCE
1. Turn ignition switch to ON position. (Do not start engine.)
2. Check voltage between A/T device harness terminal 5 and ground.
SAT758JA
OK or NG
OK©GO TO 5.
NG©GO TO 4.
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A/T SHIFT LOCK SYSTEM
Diagnostic Procedure
AT-267

10 CHECK SHIFT LOCK SOLENOID
ICheck operation by applying battery voltage shift lock solenoid harness terminals 1 and 3.
SAT762J
OK or NG
OK©GO TO 11.
NG©Replace shift lock solenoid.
11 CHECK SHIFT LOCK OPERATION
1. Reconnect shift lock harness connector.
2. Turn ignition switch from OFF to ON position. (Do not start engine.)
3. Recheck shift lock operation.
OK or NG
OK©INSPECTION END
NG©GO TO 12.
12 CHECK A/T DEVICE INSPECTION
1. Perform A/T device input/output signal inspection test.
2. If NG, recheck harness connector connection.
OK or NG
OK©INSPECTION END
NG©Repair or replace damaged parts.
A/T SHIFT LOCK SYSTEM
Diagnostic Procedure (Cont'd)
AT-270

SAT551J
Ð 2WD MODEL ÐNBAT0213S021. Remove propeller shaft from vehicle. Refer to PD-4, ªCompo-
nentsº.
2. Support A/T assembly with a jack.
3. Remove rear engine mounting member. Tighten rear engine
mounting member to the specified torque. Refer to EM-59,
ªRear Engine Mountingº.
SAT546J
4. Remove rear extension assembly.
a. Remove parking gear and needle bearing.
CAUTION:
Insert your hand between rear extension and transmission
case. Detach rear extension assembly while holding parking
gear and needle bearing by hand.
5. Replace parking components if necessary.
6. Reinstall any part removed.
IAlways use new sealing parts.
SAT081B
Park/Neutral Position Switch AdjustmentNBAT01041. Remove manual control linkage from manual shaft of A/T
assembly.
2. Set manual shaft of A/T assembly in ªNº position.
3. Loosen PNP switch fixing bolts.
4. Insert pin into adjustment holes in both PNP switch and
manual shaft of A/T assembly as near vertical as possible.
5. Reinstall any part removed.
6. Check continuity of PNP switch. Refer to ªComponents
Inspectionº, AT-103.
SAT361I
Manual Control Linkage AdjustmentNBAT0105Move selector lever from ªPº position to ª1º position. You should be
able to feel the detents in each position.
If the detents cannot be felt or the pointer indicating the position is
improperly aligned, the linkage needs adjustment.
1. Place selector lever in ªPº position.
2. Loosen lock nuts.
SAT032G
3. Tighten turn buckle until aligns with inner cable, pulling selec-
tor lever toward ªRº position side without pushing button.
4. Back off turn buckle 1 turn and tighten lock nuts to the speci-
fied torque.
Lock nut:
: 4.4 - 5.9 N´m (0.45 - 0.60 kg-m, 39.1 - 52.1 in-lb)
5. Move selector lever from ªPº position to ª1º position. Make sure
that selector lever can move smoothly.
ON-VEHICLE SERVICE
Parking Components Inspection (Cont'd)
AT-276

SAT017B
IWhen connecting torque converter to transmission, measure
distance ªAº to be certain that they are correctly assembled.
Distance ªAº:
25.0 mm (0.984 in) or more
SAT148K
IInstall converter to drive plate.
IAfter converter is installed to drive plate, rotate crankshaft
several turns and check to be sure that transmission
rotates freely without binding.
SAT149K
ITighten bolts securing transmission.
Bolt No.Tightening torque
N´m (kg-m, ft-lb)Bolt length ªº
mm (in)
1 70 - 80 (7.1 - 8.2, 52 - 59) 65 (2.56)
2 70 - 80 (7.1 - 8.2, 52 - 59) 55 (2.17)
3 29 - 39 (3.0 - 4.0, 22 - 29) 40 (1.57)
IReinstall any part removed.
SAT638A
ICheck fluid level in transmission.
IMove selector lever through all positions to be sure that trans-
mission operates correctly.
With parking brake applied, rotate engine at idling. Move selec-
tor lever through ªNº to ªDº, to ª2º, to ª1º and to ªRº positions.
A slight shock should be felt by hand gripping selector each
time transmission is shifted.
IPerform road test. Refer to ªROAD TESTº, AT-63.
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REMOVAL AND INSTALLATION
Installation (Cont'd)
AT-279

SBR686C
Precautions
PRECAUTIONSNBAX0001IWhen installing rubber parts, final tightening must be car-
ried out under unladen condition* with tires on ground.
*Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
IUse flare nut wrench when removing and installing brake
tubes.
IAfter installing removed suspension parts, check wheel
alignment and adjust if necessary.
IAlways torque brake lines when installing.
Preparation
SPECIAL SERVICE TOOLSNBAX0002The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
ST29020001
(J24319-01)
Ball joint remover
NT694
Removing tie-rod outer end and lower ball
joint
a: 34 mm (1.34 in)
b: 6.5 mm (0.256 in)
c: 61.5 mm (2.421 in)
KV401021S0
(Ð)
Bearing race drift
NT153
Installing wheel bearing outer race
KV40105400
(J36001)
Wheel bearing lock nut
wrench
NT154
Removing and installing wheel bearing lock
nut
COMMERCIAL SERVICE TOOLSNBAX0003
Tool name Description
1 Flare nut crowfoot
2 Torque wrench
NT360
Removing and installing each brake piping
a: 10 mm (0.39 in)
Hub cap drift
NT115
Installing hub cap
a: 57 mm (2.24 in) dia.
b: 46 mm (1.81 in) dia.
FRONT AXLE
Precautions
AX-2

SBR686C
Precautions
PRECAUTIONSNBAX0023IWhen installing rubber parts, final tightening must be car-
ried out under unladen condition* with tires on ground.
*Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
IUse flare nut wrench when removing and installing brake
tubes.
IAfter installing removed suspension parts, check wheel
alignment and adjust if necessary.
IAlways torque brake lines when installing.
Preparation
SPECIAL SERVICE TOOLSNBAX0024The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
KV40101000
(J25604-01)
Axle stand
NT159
Removing rear axle shaft
ST36230000
(J25840-A)
Sliding hammer
NT126
Removing rear axle shaft
ST38020000
(Ð)
Bearing lock nut wrench
NT160
Removing wheel bearing lock nut
HT72480000 or
HT72210000
(J25852-B)
Rear axle shaft bearing
puller
NT161
Removing wheel bearing
ST37840000
(Ð)
Rear axle shaft guide
NT162
Installing rear axle shaft
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REAR AXLE
Precautions
AX-17

SBR451D
Checking Brake Fluid LevelNBBR0006ICheck fluid level in reservoir tank. It should be between Max
and Min lines on reservoir tank.
IIf fluid level is extremely low, check brake system.
IIf the brake warning lamp comes on, check brake fluid level
switch and parking brake switch.
SBR389C
Checking Brake LineNBBR0007CAUTION:
If leakage occurs around joints, retighten or, if necessary,
replace damaged parts.
1. Check brake lines (tubes and hoses) for cracks, deterioration
or other damage. Replace any damaged parts.
2. Check for oil leakage by fully depressing brake pedal while
engine is running.
SBR419C
Changing Brake FluidNBBR0008CAUTION:
IRefill with new brake fluid ªDOT 3º.
IAlways keep fluid level higher than minimum line on res-
ervoir tank.
INever reuse drained brake fluid.
IBe careful not to splash brake fluid on painted areas; it
may cause paint damage. If brake fluid is splashed on
painted areas, wash it away with water immediately.
1. Clean inside of reservoir tank, and refill with new brake fluid.
2. Connect a vinyl tube to each air bleeder valve.
3. Drain brake fluid from each air bleeder valve by depressing
brake pedal.
4. Refill until brake fluid comes out of each air bleeder valve.
Use same procedure as in bleeding hydraulic system to refill
brake fluid.
Refer to ªBleeding Brake Systemº, BR-8.
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ON-VEHICLE SERVICE
Checking Brake Fluid Level
BR-7

InspectionNBBR0014CAUTION:
ICarefully monitor brake fluid level at master cylinder.
IUse new brake fluid ªDOT 3º.
IBe careful not to splash brake fluid on painted areas; it
may cause paint damage. If brake fluid is splashed on
paint areas, wash it away with water immediately.
IDepress pedal slowly when raising front brake pressure.
ICheck rear brake pressure 2 seconds after front brake
pressure reaches specified value.
IDisconnect harness connectors from ABS actuator and
electric unit before checking.
SBR212E
1. Park vehicle on a level surface with vehicle unloaded*.
* Fuel, radiator coolant and engine oil full. Spare tire, jack,
hand tools and mats in designated positions.
2. Press a lever to the stopper bolt, then check length ªBº as fol-
lows:
Length ªBº Reference (Length ªLº)
207.7 mm (8.18 in) 217.3 mm (8.56 in)
3. If length ªBº is not within specification, adjust sensor spring
length.
Removal and InstallationNBBR0015CAUTION:
IRefill with new brake fluid ªDOT 3º.
IBe careful not to splash brake fluid on painted areas; it
may cause paint damage. If brake fluid is splashed on
painted areas, wash it away with water immediately.
IDo not reuse Load Sensing Valve once it is disassembled.
IReplace damaged Load Sensing Valve as an assembly.
IWhen disassembling, apply multi-purpose grease to all
rubbing areas.
LOAD SENSING VALVE (4WD)
Inspection
BR-12