INFINITI QX4 2001 Factory Manual Online

3 CHECK SHIFT UP (D2TO D3)
Does A/T shift from D2to D3at the specified speed?
Read gear position, throttle position and vehicle speed.
Specified speed when shifting from D
2to D3:
Refer to Shift schedule, AT-356.
SAT960I
YesorNo
Ye s©GO TO 4.
No©Go to ª10. A/T Does Not Shift: D
2,D3º, AT-239.
4 CHECK SHIFT UP (D3TO D4) AND ENGINE BRAKE
Release accelerator pedal after shifting from D2to D3.
Does A/T shift from D
3to D4and does vehicle decelerate by engine brake?
Read gear position, throttle position and vehicle speed.
SAT405H
YesorNo
Ye s©1. Stop vehicle.
2. Go to ªCruise test Ð Part 3º, AT-77.
No©Go to ª11. A/T Does Not Shift: D
3,D4º, AT-242.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-76

Cruise Test Ð Part 3=NBAT0024S0406
1 VEHICLE SPEED D4POSITION
1. Confirm overdrive control switch is in ªONº position.
2. Confirm selector lever is in ªDº position.
3. Accelerate vehicle using half-throttle to D
4.
SAT812A
©GO TO 2.
2 CHECK SHIFT DOWN (D4TO D3)
1. Release accelerator pedal.
2. Set overdrive control switch to ªOFFº position while driving in D
4.
3. Does A/T shift from D
4to D3(O/D OFF)?
Read gear position and vehicle speed.
SAT999IA
YesorNo
Ye s©GO TO 3.
No©Go to ª17. A/T Does Not Shift: D
4,D3, When Overdrive Control Switch ªONº,ªOFFº,
AT-253.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-77

3 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT999IA
YesorNo
Ye s©GO TO 4.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
4 CHECK SHIFT DOWN (D3TO D2)
1. Move selector lever from ªDº to ª2º position while driving in D3(O/D OFF).
2. Does A/T shift from D
3(O/D OFF) to 22?
Read gear position.
SAT791GB
YesorNo
Ye s©GO TO 5.
No©Go to ª18. A/T Does Not Shift: D
3,D2, When Selector Lever ªDº,ª2º Positionº,
AT-254.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-78

5 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT791GB
YesorNo
Ye s©GO TO 6.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
6 CHECK SHIFT DOWN (22TO 11)
1. Move selector lever from ª2º to ª1º position while driving in 22.
2. Does A/T shift from 2
2to 11position?
SAT778B
YesorNo
Ye s©GO TO 7.
No©Go to ª19. A/T Does Not Shift: 2
2,11, When Selector lever ª2º,ª1º Positionº, AT-255.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-79

7 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT778B
YesorNo
Ye s©1. Stop vehicle.
2. Perform self-diagnosis. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
No©Go to ª20. Vehicle Does Not Decelerate By Engine Brakeº, AT-256.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-80

Symptom ChartNBAT0233Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Items Symptom Condition Diagnostic Item Reference Page
No Lock-up
Engagement/TCC
InoperativeTorque converter
is not locked up.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Park/neutral position (PNP) switch
adjustmentAT-276
4. Engine speed signal AT-116
5. A/T fluid temperature sensor AT-105
6. Line pressure test AT-62
7. Torque converter clutch solenoid valve AT-148
8. Control valve assembly AT-273
OFF vehicle 9. Torque converter AT-286
Torque converter
clutch piston slip.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Line pressure test AT-62
4. Torque converter clutch solenoid valve AT-148
5. Line pressure solenoid valve AT-162
6. Control valve assembly AT-273
OFF vehicle 7. Torque converter AT-286
Lock-up point is
extremely high or
low.
AT-245ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Torque converter clutch solenoid valve AT-148
4. Control valve assembly AT-273
Shift ShockSharp shock in
shifting from N to
D position.ON vehicle1. Engine idling rpm EC-431
2. Throttle position sensor (Adjustment) EC-174
3. Line pressure test AT-62
4. A/T fluid temperature sensor AT-105
5. Engine speed signal AT-116
6. Line pressure solenoid valve AT-162
7. Control valve assembly AT-273
8. Accumulator N-D AT-273
OFF vehicle9. Turbine revolution sensor EC-368
10. Forward clutch AT-320
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart
AT-81

Items Symptom Condition Diagnostic Item Reference Page
Shift ShockToo sharp a
shock in change
from D
1to D2.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Accumulator servo release AT-273
4. Control valve assembly AT-273
5. A/T fluid temperature sensor AT-105
OFF vehicle 6. Brake band AT-333
Too sharp a
shock in change
from D
2to D3.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Control valve assembly AT-273
OFF vehicle4. High clutch AT-317
5. Brake band AT-333
Too sharp a
shock in change
from D
3to D4.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Control valve assembly AT-273
OFF vehicle4. Brake band AT-333
5. Overrun clutch AT-320
Gear change
shock felt during
deceleration by
releasing accel-
erator pedal.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Overrun clutch solenoid valve AT-185
4. Control valve assembly AT-273
Large shock
changing from 1
2to 11in 1 position.ON vehicle 1. Control valve assembly AT-273
ON vehicle 2. Low & reverse brake AT-324
Improper Shift
TimingToo high a gear
change point from
D
1to D2, from D2to D3, from D3to
D
4.
AT-236, 239, 242ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
Gear change
directly from D
1to
D
3occurs.ON vehicle1. Fluid level AT-59
2. Accumulator servo release AT-273
OFF vehicle 3. Brake band AT-333
Too high a
change point from
D
4to D3, from D3to D2, from D2to
D
1.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
Kickdown does
not operate when
depressing pedal
in D
4within kick-
down vehicle
speed.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-82

Items Symptom Condition Diagnostic Item Reference Page
Improper Shift
TimingKickdown oper-
ates or engine
overruns when
depressing pedal
in D
4beyond kick-
down vehicle
speed limit.ON vehicle1. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
2. Throttle position sensor (Adjustment) EC-174
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
Gear change from
2
2to 23in 2 posi-
tion.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
Gear change from
1
1to 12in 1 posi-
tion.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Manual control linkage adjustment AT-276
No Down ShiftFailure to change
gear from D
4to
D
3.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Overrun clutch solenoid valve AT-185
4. Shift solenoid valve A AT-168
5. Line pressure solenoid valve AT-162
6. Control valve assembly AT-273
OFF vehicle7. Low & reverse brake AT-324
8. Overrun clutch AT-320
Failure to change
gear from D
3to
D
2or from D4to
D
2.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
5. Control valve assembly AT-273
OFF vehicle6. High clutch AT-317
7. Brake band AT-333
Failure to change
gear from D
2to
D
1or from D3to
D
1.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
5. Control valve assembly AT-273
OFF vehicle6. Low one-way clutch AT-328
7. High clutch AT-317
8. Brake band AT-333
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-83

Items Symptom Condition Diagnostic Item Reference Page
No Down ShiftFailure to change
from D
3to 22when changing
lever into 2 posi-
tion.
AT-250ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Throttle position sensor (Adjustment) EC-174
3. Overrun clutch solenoid valve AT-185
4. Shift solenoid valve B AT-172
5. Shift solenoid valve A AT-168
6. Control valve assembly AT-273
7. Manual control linkage adjustment AT-276
OFF vehicle8. Brake band AT-333
9. Overrun clutch AT-320
Does not change
from 1
2to 11in 1
position.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Shift solenoid valve A AT-168
4. Control valve assembly AT-273
5. Overrun clutch solenoid valve AT-185
OFF vehicle6. Overrun clutch AT-320
7. Low & reverse brake AT-324
No Up ShiftFailure to change
gear from D
1to
D
2.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Manual control linkage adjustment AT-276
3. Shift solenoid valve A AT-168
4. Control valve assembly AT-273
5. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
OFF vehicle 6. Brake band AT-333
Failure to change
gear from D
2to
D
3.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Manual control linkage adjustment AT-276
3. Shift solenoid valve B AT-172
4. Control valve assembly AT-273
5. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
OFF vehicle6. High clutch AT-317
7. Brake band AT-333
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-84

Items Symptom Condition Diagnostic Item Reference Page
No Up ShiftFailure to change
gear from D
3to
D
4.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Manual control linkage adjustment AT-276
3. Shift solenoid valve A AT-168
4. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
5. A/T fluid temperature sensor AT-105
OFF vehicle 6. Brake band AT-333
A/T does not shift
to D
4when driv-
ing with overdrive
control switch ON.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Park/neutral position (PNP) switch
adjustmentAT-276
3. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
4. Shift solenoid valve A AT-168
5. Overrun clutch solenoid valve AT-185
6. Control valve assembly AT-273
7. A/T fluid temperature sensor AT-105
8. Line pressure solenoid valve AT-162
OFF vehicle9. Brake band AT-333
10. Overrun clutch AT-320
Slips/Will Not
EngageVehicle will not
run in R position
(but runs in D, 2
and 1 positions).
Clutch slips.
Very poor accel-
eration.
AT-227ON vehicle1. Manual control linkage adjustment AT-276
2. Line pressure test AT-62
3. Line pressure solenoid valve AT-162
4. Control valve assembly AT-273
OFF vehicle5. Reverse clutch AT-314
6. High clutch AT-317
7. Forward clutch AT-320
8. Overrun clutch AT-320
9. Low & reverse brake AT-324
Vehicle will not
run in D and 2
positions (but
runs in 1 and R
positions).ON vehicle 1. Manual control linkage adjustment AT-276
OFF vehicle 2. Low one-way clutch AT-328
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-85