2001 INFINITI QX4 Engine control

DIAGNOSTIC PROCEDURE=NBAT0204S03NOTE:
The diagnostic procedure includes inspections for the overdrive
control and throttle position switch circuits.
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Yes (With CONSULT-II)©GO TO 2.
No (Without CONSULT-
II)©GO TO 3.
2 CHECK PNP SWITCH CIRCUIT (With CONSULT-II)
With CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out ªPº, ªRº, ªNº, ªDº, ª2º and ª1º position switches moving selector lever to each position. Check the signal of the
selector lever position is indicated properly.
SAT643J
OK or NG
OK©GO TO 5.
NG©GO TO 4.
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-258

3 CHECK PNP SWITCH CIRCUIT (Without CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminals 26, 27, 34, 35, 36 and ground while moving selector lever through each posi-
tion.
MTBL0205
SAT517J
Does battery voltage exist (B) or non-existent (0)?
Ye s©GO TO 5.
No©GO TO 4.
4 DETECT MALFUNCTIONING ITEM
Check the following items:
IPNP switch
Refer to ªComponent Inspectionº, AT-263.
IHarness for short or open between ignition switch and PNP switch (Main harness)
IHarness for short or open between PNP switch and TCM (Main harness)
OK or NG
OK©GO TO 5.
NG©Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-259

5 CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out ªOVERDRIVE SWITCHº. Check the signal of the overdrive control switch is indicated properly.
(Overdrive control switch ªONº displayed on CONSULT-II means overdrive ªOFFº.)
SAT645J
Without CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminal 22 and ground when overdrive control switch is ªONº and ªOFFº.
Voltage:
Switch position ªONº:
Battery voltage
Switch position ªOFFº:
1V or less
SAT531J
OK or NG
OK (With CONSULT-II)©GO TO 7.
OK (Without CONSULT-
II)©GO TO 9.
NG©GO TO 6.
6 DETECT MALFUNCTIONING ITEM
Check the following items:
IOverdrive control switch
Refer to ªComponent Inspectionº, AT-263.
IHarness for short or open between TCM and overdrive control switch (Main harness)
IHarness for short or open of ground circuit for overdrive control switch (Main harness)
OK or NG
OK (With CONSULT-II)©GO TO 7.
OK (Without CONSULT-
II)©GO TO 9.
NG©Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-260

7 CHECK THROTTLE POSITION SWITCH CIRCUIT (With CONSULT-II)
With CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Apply vacuum to the throttle opener, then check the following. Refer to steps 1 and 2 of ªPreparationº, ªTCM SELF-
DIAGNOSTIC PROCEDURE (No Tools)º, AT-46.
4. Read out ªCLOSED THL/SWº and ªW/O THRL/P-SWº depressing and releasing accelerator pedal.
Check the signal of throttle position switch is indicated properly.
MTBL0011
SAT646J
OK or NG
OK©GO TO 10.
NG©GO TO 8.
8 DETECT MALFUNCTIONING ITEM
Check the following items:
IThrottle position switch
Refer to ªComponent Inspectionº, AT-264.
IHarness for short or open between ignition switch and throttle position switch (Main harness)
IHarness for short or open between throttle position switch and TCM (Main harness)
OK or NG
OK©GO TO 10.
NG©Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-261

9 CHECK THROTTLE POSITION SWITCH CIRCUIT (Without CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly.
(after warming up engine)
[Refer to ªPreparationº, ªTCM SELF-DIAGNOSTIC PROCEDURE (No Tools)º, AT-46.]
MTBL0519
SAT526J
OK or NG
OK©GO TO 10.
NG©GO TO 8.
10 CHECK DTC
Perform Diagnostic procedure, AT-258.
OK or NG
OK©INSPECTION END
NG©GO TO 11.
11 CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK©INSPECTION END
NG©Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-262

SAT544J
SAT546J
Rear Oil Seal and Companion Flange Oil Seal
Replacement
NBAT0212Ð 2WD MODEL ÐNBAT0212S01NOTE:
Replace rear extension assembly as a single unit because it can-
not be disassembled.
1. Remove propeller shaft. Refer to PD-4, ªComponentsº.
2. Remove exhaust mounting and mounting bracket.
3. Disconnect revolution and speedometer sensor harness con-
nector.
4. Support A/T assembly with a jack.
5. Remove rear engine mounting member. Tighten rear engine
mounting member to the specified torque. Refer to EM-59,
ªRear Engine Mountingº.
6. 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.
7. Reinstall any part removed.
IAlways use new sealing parts.
SAT083J
Parking Components InspectionNBAT0213Ð 4WD MODEL ÐNBAT0213S011. Remove propeller shaft. Refer to PD-4, ªComponentsº.
2. Remove transfer case from vehicle. Refer to TF-119, ªRemovalº.
3. Remove A/T control cable bracket from transmission case.
SAT078B
4. Support A/T assembly with a jack.
5. Remove adapter case from transmission case.
6. Replace parking components if necessary.
7. Reinstall any part removed.
IAlways use new sealing parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON-VEHICLE SERVICE
Rear Oil Seal and Companion Flange Oil Seal Replacement
AT-275

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

RemovalNBAT0214
SAT362IA
SAT163K
CAUTION:
When removing the A/T assembly from engine, first remove
the crankshaft position sensor (OBD) from the A/T assembly
lower side.
Be careful not to damage sensor edge.
Ð 4WD MODEL ÐNBAT0214S011. Remove battery negative terminal.
2. Remove exhaust front and rear tubes.
3. Remove fluid charging pipe from A/T assembly.
4. Remove oil cooler pipe from A/T assembly.
5. Plug up openings such as the fluid charging pipe hole, etc.
6. Remove propeller shaft. Refer to PD-4, ªComponentsº.
7. Remove transfer control linkage from transfer. Refer to TF-119,
ªRemovalº.
IInsert plug into rear oil seal after removing rear propeller
shaft.
IBe careful not to damage spline, sleeve yoke and rear oil
seal.
8. Remove A/T control cable from A/T assembly.
9. Disconnect A/T solenoid, PNP switch, turbine revolution, revo-
lution and speedometer sensor harness connectors.
SAT148K
10. Remove starter motor. Refer to SC-18, ªRemoval and Installa-
tionº.
11. Remove bolts securing torque converter to drive plate.
IRemove the bolts by turning crankshaft.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REMOVAL AND INSTALLATION
Removal
AT-277