Main Power Supply and Ground Circuit Testing

Diagnostic Procedure
1. CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position. (Do not start engine.)





2. Check voltage between TCM terminals 10, 19, 28 and ground.
Voltage: Battery voltage
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.

2. CHECK TCM POWER SOURCE STEP 2
1. Turn ignition switch to OFF position.





2. Check voltage between TCM terminal 28 (Y/R) and ground.
Voltage: Battery voltage
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.

3. DETECT MALFUNCTIONING ITEM
Check the items:
^ Harness for short or open between ignition switch and TCM terminals 10, 19 and 28.
^ Fuse
^ Ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.

4. CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between TCM terminals 25, 48 and ground. Refer to "Wiring Diagram-AT- MAIN".
Continuity should exist.
OK or NG
OK >> INSPECTION END
NG >> Repair open circuit or short to ground or short to power in harness or connectors.