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 the terminals OK?
YES - Go to step 2.

NO - Repair the connectors or terminals, then go to step 27.


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

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 108 °F (42 °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), or press the engine start/stop button to select the OFF mode.

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 on the engine.

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

13. Note the value of ECT SENSOR 1 quickly 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 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 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 108 °F (42 °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 108 °F (42 °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), or press the engine start/stop button to select the OFF mode.

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 cool to the 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. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly 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. Refill the cooling system, Service and Repair then go to step 27.

NO - Intermittent failure, the system is OK at this time. Reinstall ECT sensor 1 ECT Sensor 1 Replacement and ECT sensor 2. ECT Sensor 2 Replacement Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.


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

28. Reset the PCM with the HDS.

29. Do the PCM idle learn procedure. PCM Idle Learn Procedure

30. 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 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.