2001 INFINITI QX4 clutch

6. Vehicle Does Not Creep Backward In ªRº
Position
=NBAT0078SYMPTOM:
Vehicle does not creep backward when selecting ªRº position.
1 CHECK A/T FLUID LEVEL
Check A/T fluid level again.
SAT638A
OK or NG
OK©GO TO 2.
NG©Refill ATF.
2 CHECK STALL TEST
Check stall revolution with selector lever in ª1º and ªRº positions.
Refer to AT-356.
SAT493G
OK or NG
OK©GO TO 3.
OK in ª1º position, NG in
ªRº position©1. Remove control valve assembly. Refer to ªON-VEHICLE SERVICEº, AT-273.
2. Check the following items:
IValves to control line pressure (Pressure regulator valve, pressure modifier valve, pilot
valve and pilot filter)
ILine pressure solenoid valve
3. Disassemble A/T.
4. Check the following items:
IOil pump assembly
ITorque converter
IReverse clutch assembly
IHigh clutch assembly
NG in both ª1º and ªRº
positions©GO TO 6.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
6. Vehicle Does Not Creep Backward In ªRº Position
AT-227

6 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to ªON-VEHICLE SERVICEº, AT-273.
2. Check the following items:
IValves to control line pressure (Pressure regulator valve, pressure modifier valve, pilot valve and pilot filter)
ILine pressure solenoid valve
3. Disassemble A/T.
4. Check the following items:
IOil pump assembly
ITorque converter
IReverse clutch assembly
IHigh clutch assembly
ILow & reverse brake assembly
ILow one-way clutch
©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
6. Vehicle Does Not Creep Backward In ªRº Position (Cont'd)
AT-229

6 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to ªON-VEHICLE SERVICEº, AT-273.
2. Check the following items:
IValves to control line pressure (Pressure regulator valve, pressure modifier valve, pilot valve and pilot filter)
ILine pressure solenoid valve
3. Disassemble A/T.
4. Check the following items:
IOil pump assembly
IForward clutch assembly
IForward one-way clutch
ILow one-way clutch
ILow & reverse brake assembly
ITorque converter
©Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
7. Vehicle Does Not Creep Forward In ªDº, ª2º Or ª1º Position (Cont'd)
AT-232

7 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
8 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
Refer to AT-273.
2. Check the following items:
IShift valve A
IShift valve B
IShift solenoid valve A
IShift solenoid valve B
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check the following items:
IForward clutch assembly
IForward one-way clutch
ILow one-way clutch
IHigh clutch assembly
ITorque converter
IOil pump assembly
OK or NG
OK©GO TO 7.
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
8. Vehicle Cannot Be Started From D1(Cont'd)
AT-235

7 DETECT MALFUNCTIONING ITEM
1. Remove control valve Assembly. Refer to AT-273.
2. Check the following items:
IShift valve B
IShift solenoid valve B
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check the following items:
IServo piston assembly
IHigh clutch assembly
IOil pump assembly
OK or NG
OK©GO TO 6.
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
10. A/T Does Not Shift: D2®D3(Cont'd)
AT-241

3 CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-174, ªDescriptionº.
SAT142K
OK or NG
OK©GO TO 4.
NG©Repair or replace throttle position sensor.
4 CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK©GO TO 5.
NG©GO TO 7.
5 DETECT MALFUNCTIONING ITEM
1. Remove control valve Assembly. Refer to AT-273.
2. Check the following items:
IShift valve B
IOverrun clutch control valve
IShift solenoid valve B
IPilot valve
IPilot filter
OK or NG
OK©GO TO 6.
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
11. A/T Does Not Shift: D3®D4(Cont'd)
AT-243

6 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
7 DETECT MALFUNCTIONING ITEM
1. Remove control valve Assembly. Refer to AT-273.
2. Check the following items:
IShift valve B
IOverrun clutch control valve
IShift solenoid valve B
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check the following items:
IServo piston assembly
IBrake band
ITorque converter
IOil pump assembly
OK or NG
OK©GO TO 6.
NG©Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
11. A/T Does Not Shift: D3®D4(Cont'd)
AT-244

12. A/T Does Not Perform Lock-up=NBAT0084SYMPTOM:
A/T does not perform lock-up at the specified speed.
1 CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to torque converter clutch solenoid valve circuit after cruise test?
SAT581I
YesorNo
Ye s©Check torque converter clutch solenoid valve circuit. Refer to ªDTC P0740º, AT-148.
No©GO TO 2.
2 CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-174, ªDescriptionº.
SAT142K
OK or NG
OK©GO TO 3.
NG©Repair or replace throttle position sensor.
3 DETECT MALFUNCTIONING ITEM
1. Remove control valve. Refer to AT-273.
2. Check following items:
ITorque converter clutch control valve
ITorque converter relief valve
ITorque converter clutch solenoid valve
IPilot valve
IPilot filter
OK or NG
OK©GO TO 4.
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
12. A/T Does Not Perform Lock-up
AT-245