A/T Does Not Hold Lock-Up Condition

A/T Does Not Hold Lock-up Condition

SYMPTOM: A/T does not hold lock-up condition for more than 30 seconds on "Cruise Test - Part 1".

DIAGNOSTIC PROCEDURE

1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT-73, "CONSULT-III Function (A/T)" or AT-78, "Diagnosis Procedure without CONSULT-III".
Consult-III Function (A/T)
Diagnosis Procedure Without Consult-III
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system. Refer to AT-73, "CONSULT-III Function (A/T)" or AT-78, "Diagnosis Procedure without CONSULT-III".
Consult-III Function (A/T)
Diagnosis Procedure Without Consult-III
NO >> GO TO 2.

2. CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition. Refer to AT-48, "Inspections Before Trouble Diagnosis". Inspections Before Trouble Diagnosis
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.

3. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check the following items:
- Torque converter clutch control valve
- Torque converter clutch solenoid valve
- Pilot valve
- Pilot filter
3. Disassemble A/T.
4. Check the following items:
- Torque converter.
- Oil pump assembly.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.

4. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check the following items:
- Torque converter clutch control valve
- Torque converter clutch solenoid valve
- Pilot valve
- Pilot filter
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.

5. CHECK SYMPTOM
Check again. Refer to AT-55, "Cruise Test - Part 1". Road Test
OK or NG
OK >> INSPECTION END
NG >> GO TO 6.

6. CHECK TCM
1. Check TCM input/output signals. Refer to AT-71, "TCM Terminal and Reference Value". RE4F03B 4 Speed Automatic Transmission
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.