TCM Power Supply Testing

MAIN POWER SUPPLY AND GROUND CIRCUIT

Wiring Diagram AT MAIN

AT-MAIN-01:

AT-MAIN-01

Diagnostic 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. 19, 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 terminals 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. Refer to AT-85. "SELF-DIAGNOSTIC RESULT MODE". With Manufacturer's Scan Tool

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.

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 the control valve with TCM.
NO >> Replace open circuit or short to ground and short to power in harness or connectors.