DTC Troubleshooting

DTC P0111: IAT Sensor Circuit Range/ Performance Problem ('05-07 models)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

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

Are the connections and terminals OK?

YES - Go to step 2.

NO - Repair the connectors or terminals, then go to step 15.

2. Remove the MAF sensor/IAT sensor.
3. Allow IAT sensor to cool to ambient temperature.
4. Note the ambient temperature.
5. Connect the MAF sensor/IAT sensor to the 5P connector, but do not install the sensor to the air cleaner.
6. Turn the ignition switch ON (III).
7. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
8. Compare the value of IAT SENSOR and the ambient temperature.

Does the value of IAT SENSOR differ 5.4 °F (3 °C) or more?

YES - Go to step 13.

NO - Go to step 9.

9. Disconnect the MAF sensor/IAT sensor from the 5P connector.
10. Using a heat gun, blow hot air on the MAF sensor/ IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
11. Connect MAF sensor/IAT sensor to the 5P connector, but do not install the sensor on the air cleaner.
12. Check the IAT SENSOR in the DATA LIST with the HDS.

Does the IAT SENSOR change 58 °F (32 °C) or more?

YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM.

NO - Go to step 13.

13. Turn the ignition switch OFF.
14. Replace the MAF sensor/IAT sensor.
15. Turn the ignition switch ON (II).
16. Resat the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure. Programming and Relearning
18. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0111 indicated?

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

NO - Go to step 19.

19. Monitor the OBD STATUS for DTC P0116 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 18, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at IAT sensor and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.