23-03

EPS DTC Troubleshooting: 23-03

DTC 23-03: F-CAN Engine Speed Signal Data (Initial Diagnosis/Regular Diagnosis)

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) terminal No. 4 and EPS control unit connector A (11P) terminal No. 3.

Is there continuity?
YES - Go to step 11.

NO - Repair open in the wire between the EPS control unit and the ECM/PCM.






11. Check for continuity between ECM/PCM connector A (49P) terminal No. 3 and EPS control unit connector A (11P) terminal No. 5.

Is there continuity?
YES - Go to step 12.

NO - Repair open in the wire between the EPS control unit and the ECM/PCM.






12. Connect ECM/PCM connector A (49P).

13. Connect EPS control unit connector A (11P).

14. Start the engine.

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

Is 0 rpm indicated?
YES - Check for poor connections or loose terminals at the ECM/PCM If necessary, substitute a known-good ECM/PCM. Initial Inspection and Diagnostic Overview and recheck.

NO - 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