DTC Troubleshooting

DTC P0117: ECT Sensor Circuit Low Voltage ('04-05 models)

DTC P0117: ECT Sensor 1 Circuit Low Voltage ('06-08 models)

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- Information marked with an asterisk (*) applies to '04-05 models.
- Information marked with double asterisk (**) applies to '06-08 models.

1. Turn the ignition switch ON (II).
2. Check the ECT SENSOR (1) in the DATA LIST with the HDS.

Is about 356 °F (180 °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 the ECT sensor*/ECT sensor 1** and the ECM/PCM.

3. Turn the ignition switch OFF.
4. Disconnect the ECT sensor*/ECT sensor 1** 2P connector.
5. Turn the ignition switch ON (II).
6. Check the ECT SENSOR (1) in the DATA LIST with the HDS.

Is about 356 °F (180 °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 OFF.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/PCM connector B (24P).
10. Check for continuity between ECT sensor*/ECT sensor 1** 2P connector terminal No. 1 and body ground.






Is there continuity?

YES - Repair short in the wire between the ECT sensor*/ECT sensor 1** and the ECM/PCM (B8), then go to step 13.

NO - Go to step 18.

11. Turn the ignition switch OFF.
12. Replace the ECT sensor*/ECT sensor 1**.
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure.
17. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0117 indicated?

YES - Check for poor connections or loose terminals at the ECT sensor*/ECT sensor 1** and the ECM/PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or 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, or substitute a known-good ECM/PCM.
20. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0117 indicated?

YES - Check for poor connections or loose terminals at the ECT sensor*/ECT sensor 1** 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. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.