DTC Troubleshooting

DTC Troubleshooting: P0111

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 Initial Inspection and Diagnostic Overview.

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

Are the connections and terminals OK?

YES -

Go to step 2.

NO -

Repair the connections or terminals, then go to step 15.

2. Remove the MAF sensor/IAT sensor Service and Repair.

3. Allow the MAF sensor/IAT sensor to cool to the ambient temperature.

4. Note the ambient temperature.

5. Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.

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

7. Quickly note the value of the IAT SENSOR in the DATA LIST with the HDS.

8. Compare the value of the IAT SENSOR to the ambient temperature.

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

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 the MAF sensor/IAT sensor to its 5P connector, but do not install it.

12. Check the IAT SENSOR in the DATA LIST with the HDS.

Does the IAT SENSOR change 76 °F (42 °C) or more?

YES -

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

NO -

Go to step 13.

13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

14. Replace the MAF sensor/IAT sensor Service and Repair.

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

16. Reset the PCM with the HDS.

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

18. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0111 indicated?

YES -

Check for poor connections or loose terminals at the MAF sensor/IAT sensor 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.