A/T Does Not Perform Lock-Up

A/T Does Not Perform Lock-up

SYMPTOM: A/T does not perform lock-up at the specified speed.

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis.
Do the self-diagnostic results indicate torque converter clutch solenoid valve, engine speed signal, turbine revolution sensor, accelerator pedal position sensor, CAN communication?
YES >>Check the malfunctioning system.
NG >>GO TO 2.

2. CHECK A/T FLUID LEVEL





Check A/T fluid level.
OK or NG
OK >>GO TO 3.
NG >>Refill ATF.

3. CHECK LINE PRESSURE





Check line pressure at the engine stall point.
OK or NG
OK >>GO TO 6.
NG - 1 >>Line pressure high. GO TO 4.
NG - 2 >>Line pressure low. GO TO 5.

4. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM.
2. Disassemble A/T.
3. Check the following items:
- Oil pump assembly.
OK or NG
OK >>GO TO 7.
NG >>Repair or replace damaged parts.

5. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM.
2. Disassemble A/T.
3. Check the following items:
- Oil pump assembly.
- Power train system.
- Transmission case.
OK or NG
OK >>GO TO 7.
NG >>Repair or replace damaged parts.

6. CHECK A/T FLUID CONDITION





1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >>GO TO7.
NG >>GO TO 10.

7. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts.
OK or NG
OK >>GO TO 8.
NG >>Repair or replace damaged parts.

8. CHECK SYMPTOM
Check again.
OK or NG
OK >>INSPECTION END
NG >>GO TO 9.

9. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >>INSPECTION END
NG >>Repair or replace damaged parts.

10. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts.
OK or NG
OK >>GO TO 8.
NG >>Repair or replace damaged parts.