A/T Does Not Lock-Up

TROUBLE DIAGNOSIS FOR SYMPTOMS


A/T Does Not Perform Lock-up


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

DIAGNOSTIC PROCEDURE
1.CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to Inspections Before Trouble Diagnosis.
OK or NG
OK - GO TO 2.
NG - Refill ATF.
2.CHECK STOP LAMP SWITCH CIRCUIT
Check the stop lamp switch circuit. Refer to TCS/ABS (with TCS/ABS) or VDC/TCS/ABS (with VDC/TCS/ABS).
OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts.
3.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis.
Is any malfunction detected by self-diagnostic?
YES - Check the malfunctioning system.
NO - GO TO 4.
4.DETECT MALFUNCTIONING ITEM
1. Control valve assembly. Refer to Service and Repair.
2. Disassemble A/T. Refer to Disassembly.
3. Check the following items:
- Torque converter. Refer to Disassembly.
OK or NG
OK - GO TO 5.
NG - Repair or replace damaged parts.
5.CHECK TCM
1. Check TCM input/output signal. Refer to Pinout Values and Diagnostic Parameters.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - GO TO 6.
NG - Repair or replace damaged parts.
6.CHECK SYMPTOM
Check again.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.