23-03

EPS DTC Troubleshooting: 23-03

DTC 23-03:

CAN Engine Speed Data

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

2. Clear the DTC with the HDS.

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

4. Start the engine.

5. Check for DTCs with the HDS.

Is DTC 23-03 indicated?

YES -

Go to step 6.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit.�

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

7. Short the SCS line with the HDS.

8. Disconnect ECM/PCM connector A (49P).

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

10. Check for continuity between ECM/PCM connector A (49P) terminals and EPS control unit connector A (11P) terminals.









Is there continuity?

YES -

Go to step 11.

NO -

Repair an open in the wire between the EPS control unit and the ECM/PCM.�

11. Reconnect ECM/PCM connector A (49P).

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

13. Start the engine.

14. Check the ENGINE SPEED in the EPS DATA LIST with the HDS.

Is engine speed indicated?

YES -

Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit Service and Repair.�

NO -

Update the ECM/PCM if it does not have the latest software ECM/PCM Update (A/T), or substitute a known-good ECM/PCM, then go to step 1 and recheck. If the ECM/PCM was updated and DTCs are not indicated, troubleshooting is complete. If the ECM/PCM was substituted and DTCs are not indicated, replace the original ECM/PCM Service and Repair.�