Infiniti QX4 (R50). Manual — part 62
12. A/T Does Not Perform Lock-up
=NBAT0084
SYMPTOM:
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
Yes or No
Yes
©
Check torque converter clutch solenoid valve circuit. Refer to “DTC P0740”, AT-148.
No
©
GO TO 2.
2
CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-174, “Description”.
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:
I
Torque converter clutch control valve
I
Torque converter relief valve
I
Torque converter clutch solenoid valve
I
Pilot valve
I
Pilot 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
4
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.
TROUBLE DIAGNOSES FOR SYMPTOMS
12. A/T Does Not Perform Lock-up (Cont’d)
AT-246
13. A/T Does Not Hold Lock-up Condition
=NBAT0085
SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.
1
CHECK DIAGNOSTIC RESULTS
Does self-diagnosis show damage to engine speed signal circuit after cruise test?
SAT582I
Yes or No
Yes
©
Check engine speed signal circuit. Refer to “DTC P0725”, AT-116.
No
©
GO TO 2.
2
CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 5.
3
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot 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
13. A/T Does Not Hold Lock-up Condition
AT-247
4
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.
5
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot filter
3. Disassemble A/T.
4. Check torque converter and oil pump assembly.
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
13. A/T Does Not Hold Lock-up Condition (Cont’d)
AT-248
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