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. CONSULT-III Function (Transmission).
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. CONSULT-III Function (Transmission).
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.