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 "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE". P0740
No >> GO TO 2.

2.CHECK THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR]





Check throttle position sensor [accelerator pedal position (APP) sensor]. Refer to "DTC P0122, P0123 TP SENSOR" and "DTC P2122, P2123 APP SENSOR" with QR25DE), or "DTC P0122, P0123 TP SENSOR" and "DTC P2122, P2123 APP SENSOR" with VQ35DE). P0122
OK or NG
OK >> GO TO 3.
NG >> Repair or replace throttle position sensor [accelerator pedal position (APP) sensor].

3. DETECT MALFUNCTIONING ITEM
1. Remove control valve.
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 >> 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.