A/T Does Not Hold Lock-Up Condition

13. A/T Does Not Hold Lock-up Condition

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?
Yes or No
Yes >>Check engine speed signal circuit.
No >>GO TO 2.

2. CHECK A/T FLUID CONDITION





1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >>GO TO 4.
NG >>GO TO 3.

3. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check the following items:
- Torque converter clutch control valve
- Pilot valve
- Pilot filter
3. Disassemble A/T.
4. Check torque converter and oil pump assembly.
OK or NG
OK >>GO TO 5.
NG >>Repair or replace damaged parts.

4. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check the following items:
- Torque converter clutch control valve
- Pilot valve
- 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.