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.
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 P0222, P0223 TP SENSOR and DTC P2138 APP SENSOR.
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. Pinout Values and Diagnostic Parameters
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.