DTC Troubleshooting

DTC Troubleshooting: P1658, P1658

DTC P1658:

ETCS Control Relay ON Malfunction

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- Information marked with an asterisk (*1) applies to '09-10 models.
- Information marked with an asterisk (*2) applies to '11 model.

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

2. Do the ETCS TEST in the INSPECTION MENU with the HDS.

Is the RELAY circuit OK?

YES -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM.�

NO -

Go to step 3.

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

4. Open the fuse access panel (A), then remove the ETCS control relay (B) from the under-dash fuse/relay box.





5. Test the ETCS control relay Testing and Inspection.

Is the ETCS control relay OK?

YES -

Go to step 6.

NO -

Replace the ETCS control relay, then go to step 13.

6. Jump the SCS line with the HDS.

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

8. Check for continuity between ECM/PCM connector terminal A21 and body ground.





Is there continuity?

YES -

Repair a short in the wire between the ECM/PCM(A21) and the ETCS control relay, then go to step 13.

NO -

Go to step 9.

9. Disconnect ECM/PCM connector C (49P).

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

11. Measure the voltage between ECM/PCM connector terminal C1 and body ground.





Is there battery voltage?

YES -

Repair a short to power in the wire between the ECM/PCM(C1) and the ETCS control relay, then go to step 12.

NO -

Go to step 18.

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

13. Reconnect all connectors.

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

15. Reset the ECM/PCM with the HDS.

16. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure (A/T).

17. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1658 indicated?

YES -

Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to step 1.

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

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

19. Reconnect all connectors.

20. Update the ECM/PCM if it does not have the latest software ECM/PCM Update (A/T), or substitute a known-good ECM/PCM.

21. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1658 indicated?

YES -

Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to step 1.

NO -

If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�