DTC Troubleshooting
DTC Troubleshooting: P1116
DTC P1116: ECT Sensor 1 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 27.
2. Turn the ignition switch to ON (II).
3. Check for Temporary DTCs or 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 129 °F (54 °C) or less, or 1.54 V or more indicated?
YES - Replace ECT sensor 1, ECT Sensor 1 Replacement then go to step 28.
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 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).
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?
YES - Replace ECT sensor 1, ECT Sensor 1 Replacement 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 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 118 °F (48 °C) or less, or 1.75 V or more 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 for 10 minutes.
18. Check ECT SENSOR 2 in the DATA LIST with the HDS.
Is about 131 °F (55 °C) or less, or 1.50 V or more 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 cool to ambient temperature.
23. Note the ambient temperature.
24. Connect ECT sensor 1 to its 2P connector, and ECT sensor 2 to its 2P connector, but do not install them on the engine.
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, 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 PCM, then reconnect all connectors, and refill the cooling system. Service and Repair
27. Refill the engine coolant. Service and Repair
28. Turn the ignition switch to ON (II).
29. Reset the PCM with the HDS.
30. Do the PCM idle learn procedure. PCM Idle Learn Procedure
31. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0116 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 Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.