A/T Does Not Perform Lock-Up

12. A/T Does Not Perform Lock-up

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?

Yes or No?

Yes >> Check torque converter clutch solenoid valve circuit.
Refer to "P0740; Diagnostic Procedure" P0740.

No >> GO TO 2.







2. CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to "DTC P0121 TP SENSOR" P0121.

OK or NG?

OK >> GO TO 3.

NG >> Repair or replace throttle position sensor.


3. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check following items:
- Torque converter clutch control valve
- Torque converter relief valve
- Torque converter clutch solenoid valve
- Pilot valve
- Pilot filter

OK or NG?

OK >> GO TO 4.

NG >> Repair or replace damaged parts.


4. CHECK SYMPTOM
Check again.

OK or NG?

OK >> INSPECTION END.

NG >>
1. Perform TCM input/output signal inspection Pinout Values and Diagnostic Parameters.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.