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.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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), or press the engine start/stop button to select the OFF mode.

4. Remove the ETCS control relay (A) from the under-hood 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 A29 and body ground.





Is there continuity?

YES -

Repair short in the wire between the ECM/PCM(A29) 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), or press the engine start/stop button to select the ON mode.

11. Measure the voltage between ECM/PCM connector terminal C4 and body ground.





Is there battery voltage?

YES -

Repair short to power in the wire between the ECM/PCM(C4) and the ETCS control relay, then go to step 12.

NO -

Go to step 18.

12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

13. Reconnect all connectors.

14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

15. Reset the ECM/PCM with the HDS.

16. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.

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), or press the engine start/stop button to select the OFF mode.

19. Reconnect all connectors.

20. Update the ECM/PCM if it does not have the latest software ECM/PCM Update, 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.�