DTC P0111: IAT Sensor Circuit Range/Performance Problem
- Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the MAF sensor/IAT sensor.
Are the connections and the terminals OK?
YES -Go to step 2.
NO -Repair the connections or terminals, then go to step 15.
- Remove the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT ).
- Allow IAT sensor to cool to the ambient temperature.
- Note the ambient temperature.
- Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.
- Turn the ignition switch to ON (II).
- Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
- 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 from the ambient temperature?
YES -Go to step 13.
NO -Go to step 9.
- Disconnect the MAF sensor/IAT sensor from its 5P connector.
- 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.
Does the IAT SENSOR change 61°F (34°C) or more from the ambient temperature?
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 ECM/PCM.
NO -Go to step 13.
- Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.
- Check the IAT SENSOR in the DATA LIST with the HDS.
- Turn the ignition switch to LOCK (0).
- Replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT ).
- Turn the ignition switch to ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0111 indicated?
YES -Check for poor connections or loose terminals at the MAF sensor/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.