DTC Troubleshooting

DTC Troubleshooting: P1116, 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 connections or terminals, then go to step 28.

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 15.

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 97 °F (36 °C) or less indicated?

YES -

Replace ECT sensor 1 ECT Sensor 1 Replacement, then go to step 27.

NO -

Go to step 6.

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

7. Drain the coolant Service and Repair.

8. Remove ECT sensor 1 ECT Sensor 1 Replacement.

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

10. Note the ambient temperature.

11. Connect ECT sensor 1 to its 2P connector, but do not install it.

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

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

14. Compare the value of ECT SENSOR 1 and 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 27.

NO -

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

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

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

Is about 97 °F (36 °C) or less indicated?

YES -

Replace ECT sensor 1 ECT Sensor 1 Replacement, then go to step 27.

NO -

Go to step 17.

17. Let the engine idle 10 minutes.

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

Is about 97 °F (36 °C) or less indicated?

YES -

Replace ECT sensor 2 ECT Sensor 2 Replacement, then go to step 27.

NO -

Go to step 19.

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

20. Drain the coolant Service and Repair.

21. Remove ECT sensor 1 ECT Sensor 1 Replacement and ECT sensor 2 ECT Sensor 2 Replacement.

22. Allow the sensors to the cool to ambient temperature.

23. Note the ambient temperature.

24. Connect ECT sensor 1 and ECT sensor 2 to their 2P connectors, but do not install them.

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

26. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and 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, then go to step 27.

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/PCM.�

27. Refill the engine coolant Service and Repair.

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

29. Reset the ECM/PCM with the HDS.

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

31. 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/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.�