Main Power Supply and Ground Circuit

MAIN POWER SUPPLY AND GROUND CIRCUIT

Wiring Diagram - AT - MAIN

AT-MAIN-01:

TCM terminals and data are reference value. Measured between each terminal and ground.





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 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.
3. Check voltage between A/T assembly harness connector and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.

3.DETECT MALFUNCTIONING ITEM
Check the following.
^ 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
^ 10 A fuse (No. 32, located in the fuse and fusible link block) and 10 A fuse (No. 83, 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 terminals and ground.
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 A/T assembly harness connector pin 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

With CONSULT-III
Select "SELF-DIAG RESULTS" mode for "TRANSMISSION" with CONSULT-III.
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. Refer to AT-80, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)

7.CHECK TERMINAL CORD ASSEMBLY
1. Remove control valve with TCM.
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 control valve with TCM.
NG >> Replace open circuit or short to ground and short to power in harness or connectors.