Infiniti I35 (A33). Manual — part 63
A/T Does Not Perform Lock-up
=NHAT0099
SYMPTOM:
A/T does not perform lock-up at the specified speed.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to A/T fluid temperature sensor, vehicle speed sensor·A/T (revolution sensor), engine
speed signal, torque converter clutch solenoid valve or vehicle speed·MTR after cruise test?
SAT734K
Yes or No
Yes
©
Check damaged circuit. Refer to “DTC P0710, P0720, P0725, P0740 or VEHICLE
SPEED SENSOR·MTR”, AT-114, 120, 125, or 206.
No
©
GO TO 2.
2
CHECK ACCELERATOR PEDAL POSITION SENSOR
Check accelerator pedal position sensor. Refer to AT-188, “DTC P1705”.
SAT516KB
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace accelerator pedal position sensor.
3
DETECT MALFUNCTIONING ITEM
1. Remove control valve. Refer to AT-282.
2. Check the following items:
I
Torque converter clutch control valve
I
Torque converter relief valve
I
Pilot valve
I
Pilot filter
3. Disassemble A/T. Refer to AT-293.
4. Check the following item:
I
Torque converter
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
A/T Does Not Perform Lock-up
AT-249
4
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 5.
5
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
A/T Does Not Perform Lock-up (Cont’d)
AT-250
A/T Does Not Hold Lock-up Condition
=NHAT0100
SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to engine speed signal circuit after cruise test?
SAT551K
Yes or No
Yes
©
Check engine speed signal circuit. Refer to “DTC P0725”, AT-125.
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 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-282.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot filter
3. Disassemble A/T. Refer to AT-293.
4. Check torque converter and oil pump assembly.
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
A/T Does Not Hold Lock-up Condition
AT-251
4
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-282.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot filter
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
5
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 6.
6
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
A/T Does Not Hold Lock-up Condition (Cont’d)
AT-252
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