Main Power Supply and Ground Circuit

MAIN POWER SUPPLY AND GROUND CIRCUIT

AT-MAIN-01:

Wiring Diagram - AT - MAIN





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

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.
^ 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. 37, located in the fuse and fusible link block) and 10A fuse (No. 83, located in the IPDM E/R)
^ 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 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.
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-94, "SELF-DIAGNOSTIC RESULT MODE". CONSULT Inspection Procedure
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 "SELF-DIAGNOSTIC RESULT MODE".

7. CHECK TERMINAL CORD ASSEMBLY
1. Remove control valve with TCM. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
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. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".
NG >> Replace open circuit or short to ground and short to power in harness or connectors.