Main Power Supply And Ground Circuit

MAIN POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure


1. CHECK TCM POWER SOURCE STEP 1






1.Turn ignition switch OFF.
2.Disconnect A/T assembly harness connector.
3.Check voltage between A/T assembly harness connector terminals and ground.





OK or NG
OK- GO TO 2.
NG- GO TO 3.

2. CHECK TCM POWER SOURCE STEP 2






1.Disconnect A/T assembly harness connector.
2.Turn ignition switch ON. (Do not start engine.)
3.Check voltage between A/T assembly harness connector terminals and ground.





OK or NG
OK- GO TO 4.
NG- GO TO 3.

3. DETECT MALFUNCTIONING ITEM

Check the following items:
- Harness for short or open between battery and A/T assembly harness connector terminals 1, 2
- Harness for short or open between ignition switch and A/T assembly harness connector terminal 6
- 10A fuse [No. 3, 4, located in the fuse block (J/B)] and 10A fuse (No. 49, located in the IPDM E/R)
- Ignition switch
OK or NG
OK- GO TO 4.
NG- Repair or replace damaged parts.

4. CHECK TCM GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect A/T assembly harness connector.





3.Check continuity between A/T assembly harness connector F9
terminals 5, 10 and ground.
Continuity should exist.
If OK, check harness for short to ground and short to power.
OK or NG
OK- GO TO 5.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

5. DETECT MALFUNCTIONING ITEM

Check the following items:
- The A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK- GO TO 6.
NG- Repair or replace damaged parts.

6. PERFORM SELF-DIAGNOSIS

Perform self-diagnosis. Diagnosis System (TCM).
OK or NG
OK-INSPECTION END
NG-1- Self-diagnosis does not activate: GO TO 7.
NG-2- DTC is displayed: Check the malfunctioning system. Diagnosis System (TCM).

7. CHECK TERMINAL CORD ASSEMBLY

1.Remove control valve with TCM. Service and Repair.
2.Disconnect A/T assembly harness connector and TCM connector.





3.Check continuity between A/T assembly harness connector terminals and TCM connector terminals.










4.Check continuity between A/T assembly harness connector terminals and TCM connector terminals.





5.If OK, check harness for short to ground and short to power.
OK or NG
OK- Replace the control valve with TCM. Service and Repair.
NG- Replace open circuit or short to ground and short to power in harness or connectors.