DTC Troubleshooting

DTC Troubleshooting: P0117

DTC P0117: ECT Sensor 1 Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Reading and Clearing Diagnostic Trouble Codes

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

2. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Is about 356 degrees F (180 degrees C) or more, or 0.08 V or less indicated?

YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM.

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

4. Disconnect the ECT sensor 1 2P connector.

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

6. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Is about 356 degrees F (180 degrees C) or more, or 0.08 V or less indicated?

YES - Go to step 7.

NO - Go to step 11.

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

8. Jump the SCS line with the HDS.

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

10. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground.

Is there continuity?

YES - Repair short in the wire between ECT sensor 1 and the ECM/PCM (B24), then go to step 13.

NO - Go to step 18.






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

12. Relace the ECT sensor 1.

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

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

Is DTC P0117 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 1 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. Reconnect all connectors.

19. Update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known good ECM/PCM. Reading and Clearing Diagnostic Trouble Codes

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

Is DTC P0117 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM. If the ECM/PCM was updated, substitute a known good ECM/PCM Reading and Clearing Diagnostic Trouble Codes 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. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.