22-01

EPS DTC Troubleshooting: 22-01

DTC 22-01:

Engine Speed Signal (Initial Diagnosis/Regular Diagnosis)

1. Start the engine.

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

Is 0-300 rpm indicated?

YES -

Go to step 3.

NO -

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

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

4. Short the SCS line with the HDS.

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

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

7. Check for continuity between body ground and EPS control unit connector A (11P) terminal No. 9.





Is there continuity?

YES -

Repair a short to body ground in the wire between the EPS control unit and the ECM/PCM.�

NO -

Go to step 8.

8. Check for continuity between ECM/PCM connector A (49P) terminal No. 29 and EPS control unit connector A (11P) terminal No. 9.





Is there continuity?

YES -

Go to step 9.

NO -

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

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

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

11. Measure the voltage between body ground and EPS control unit connector A (11P) terminal No. 9.





Is there about 5 V?

YES -

Check for poor connections or loose terminals at the PCM. If necessary, substitute a known-good 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.�