Main Power Supply And Ground Circuit

MAIN POWER SUPPLY AND GROUND CIRCUIT





Wiring Diagram - AT - MAIN






TCM TERMINALS AND REFERENCE VALUES
Automatic Transmission .




Diagnosis Procedure
1.CHECK TCM POWER SOURCE
1. Turn ignition switch ON. (Do not start engine.)





2. Check voltage between TCM connector terminals and ground.





3. Turn ignition switch OFF.





4. Check voltage between TCM connector terminals and ground.





OK or NG
OK - GO TO 3.
NG - GO TO 2.
2.DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between ignition switch and TCM terminals 10, 19
- Harness for short or open between battery and TCM terminal 28
- 10A fuse (No.13, located in the fuse block) and 10A fuse (No.49, located in the IPDM E/R)
- Ignition switch. Description and Operation .
OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts.
3.CHECK TCM GROUND CIRCUIT
1. Turn ignition switch OFF.





2. Check continuity between TCM connector terminals and ground.





OK or NG
OK - GO TO 4.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK SYMPTOM
Drive for a while to check that there is no malfunction.
OK or NG
OK - INSPECTION END
NG - GO TO 5.
5.CHECK TCM
1. Check TCM input/output signal. Automatic Transmission .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.