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DTC P0111: IAT Sensor Circuit Range/ Performance Problem

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 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 IAT sensor (see IAT SENSOR REPLACEMENT ).
  3. Allow the IAT sensor to cool to ambient temperature.
  4. Note the ambient temperature.
  5. Connect the IAT sensor to the 2P connector, but do not install the sensor onto the air cleaner.
  6. Turn the ignition switch ON (II).
  7. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
  8. Compare the value of the IAT SENSOR and the ambient temperature.

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

    YES  - Go to step  13.

    NO  - Go to step  9.

  9. Disconnect the IAT sensor from the 2P connector.
  10. Using a heat gun, blow hot air on the IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
  11. Connect the IAT sensor to the 2P connector, but do not install the sensor onto the air cleaner.
  12. Check the IAT SENSOR in the DATA LIST with the HDS.

    Does the IAT SENSOR change 61°F (34°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 IAT sensor (see IAT SENSOR REPLACEMENT ).
  15. Turn the ignition switch ON (II).
  16. Reset the ECM/PCM with the HDS.
  17. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  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  - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

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