DTC Troubleshooting

DTC Troubleshooting: P1116

DTC P1116:

ECT Sensor 1 Circuit Range/Performance Problem

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- If DTC P0111 is stored at the same time as DTC P1116, troubleshoot DTC P0111 first, then recheck for DTC P1116.

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2.

Are the connections and terminals OK?

YES -

Go to step 2.

NO -

Repair the connectors or terminals, then go to step 22.

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

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

Are DTC P1116 and P2183 indicated at the same time?

YES -

Go to step 12.

NO -

Go to step 4.

4. Start the engine, and let it idle for 10 minutes.

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

Is about 117 °F (47 °C) or less indicated?

YES -

Replace ECT sensor 1 ECT Sensor 1 Replacement, then go to step 22.

NO -

Go to step 6.

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

7. Allow ECT sensor 1 to cool to the ambient temperature.

8. Note the ambient temperature.

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

10. Quickly note the value of ECT SENSOR 1 in the DATA LIST with the HDS.

11. Compare the value of ECT SENSOR 1 to the ambient temperature.

Does the value of ECT SENSOR 1 differ 5.4 °F (3 °C) or more from the ambient temperature?

YES -

Replace ECT sensor 1 ECT Sensor 1 Replacement, then go to step 22.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM.�

12. Start the engine, and let it idle for 10 minutes.

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

Is about 117 °F (47 °C) or less indicated?

YES -

Replace ECT sensor 1 ECT Sensor 1 Replacement, then go to step 22.

NO -

Go to step 14.

14. Let the engine idle for 10 minutes.

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

Is about 140 °F (60 °C) or less indicated?

YES -

Replace ECT sensor 2 ECT Sensor 2 Replacement, then go to step 22.

NO -

Go to step 16.

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

17. Allow ECT sensor 1 and ECT sensor 2 to cool to the ambient temperature.

18. Note the ambient temperature.

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

20. Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.

21. Compare the value of ECT SENSOR 1 to the ambient temperature, and the value of ECT SENSOR 2 to the ambient temperature individually.

Does one of the sensors differ more than 5.4 °F (3 °C) from the ambient temperature?

YES -

Replace the sensor that differed more than 5.4 °F (3 °C) from the ambient temperature. Refill the cooling system Service and Repair, then go to step 22.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM.�

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

23. Reset the ECM with the HDS.

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

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

Is DTC P1116 indicated?

YES -

Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM, 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.