Main Power Supply and Ground Circuit Check

Main Power Supply and Ground Circuit Check

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
- 10 A fuse (No. 22, located in the fuse and fusible link block) and 10 A fuse (No. 49, located in the IPDM E/R)
- Ignition switch. Refer to [Ignition Power Supply: Wiring Diagram] Ignition Power Supply Wiring Diagram.

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.











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 DTC CHECK

Perform "DTC check". Refer to [SDT Function (AT)] Scan Tool Testing and Procedures.

OK or NG
OK
INSPECTION END
NG-1
"DTC check" does not activate: GO TO 7.
NG-2
ERROR! Unknown action!DTC is displayed: Check the malfunctioning system. Refer to [SDT Function (AT)] Scan Tool Testing and Procedures.

7. CHECK TERMINAL CORD ASSEMBLY

1 Remove control valve with TCM. Refer to [Control Valve with TCM: Removal and Installation] Service and Repair.
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: Removal and Installation] Service and Repair.
NG
Replace open circuit or short to ground and short to power in harness or connectors.