12-01

EPS DTC Troubleshooting: 12-01

DTC 12-01: Motor Power Supply Voltage (Regular Diagnosis)

1. Turn the ignition switch to ON (II).

2. Check the BATTERY in the EPS DATA LIST with the HDS.

Is there battery voltage?
YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit.

NO - Go to step 3.


3. Turn the ignition switch to LOCK (0).

4. Check the No. 2 (70 A) fuse in the battery terminal fuse box.

Is the fuse OK?
YES - Reinstall the fuse, and go to step 5.

NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit.


5. Disconnect EPS control unit connector A (11P).

6. Measure the voltage between EPS control unit connector A (11P) terminal No. 11 and body ground.

Is there battery voltage?
YES - Go to step 7.

NO - Repair open in the wire between the EPS control unit and No. 2 (70 A) fuse in the battery terminal fuse box.






7. Reconnect EPS control unit connector A (11P).

8. Turn the ignition switch to ON (II).

9. Clear the DTC with the HDS.

10. Turn the ignition switch to LOCK (0).

11. Start the engine.

12. Check for DTCs with the HDS.

Is DTC 12-01 indicated?
YES - Replace the EPS control unit. Service and Repair

NO - Troubleshooting is complete.