Main Power Supply and Ground Circuit Testing

AT-MAIN-01:

Wiring Diagram - AT - MAIN

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 TO2.
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 following items:
^ Harness for short or open between ignition switch and TCM terminals 10, 19 and 28 (Main harness)
^ Fuse
^ Ignition switch
Refer to "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic
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.