A/T Does Not Perform Lock-Up

A/T Does Not Perform Lock-up

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

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT-94, "SELF-DIAGNOSTIC RESULT MODE", With Manufacturer's Scan Tool AT-104, "Diagnostic Procedure Without CONSULT-II". Without Scan Tool
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system. Refer to "SELF-DIAGNOSTIC RESULT MODE", "Judgement Self-diagnosis Code".
NO >> GO TO 2.

2. CHECK A/T FLUID LEVEL





Check A/T fluid level. Refer to "Checking A/T Fluid".

OK or NG
OK >> GO TO 3.
NG >> Refill ATF.

3. CHECK LINE PRESSURE





Check line pressure at the engine stall point. Refer to "LINE PRESSURE TEST".

OK or NG
OK >> GO TO 6.
NG -1 >> Line pressure high. GO TO 4.
NG - 2 >> Line pressure low. GO TO 5.

4. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Disassemble A/T. Refer to "DISASSEMBLY".
3. Check the following.
- Oil pump assembly. Refer to "Oil Pump".

OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

5. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Disassemble A/T. Refer to "DISASSEMBLY".
3. Check the following.
- Oil pump assembly. Refer to "Oil Pump".
- Power train system. Refer to "DISASSEMBLY".
- Transmission case. Refer to "DISASSEMBLY".

OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

6. CHECK A/T FLUID CONDITION





1. Remove oil pan. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Check A/T fluid condition. Refer to "Fluid Condition Check".

OK or NG
OK >> GO TO 7.
NG >> GO TO 10.

7. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No. 24).

OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.

8. CHECK SYMPTOM
Check again. Refer to "Cruise Test - Part 1".

OK or NG
OK >> INSPECTION END
NG >> GO TO 9.

9. CHECK TCM
1. Check TCM input/output signals. Refer to "TCM Input/Output Signal Reference Values".
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.

OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.

10. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No. 24).

OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.