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 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 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