DTC P0111, P011B: IAT Sensor Circuit Range/Performance Problem (L4)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems (L4), or How to Troubleshoot the Dual Clutch Transmission (DCT), or How to Troubleshoot the Brake Booster Pressure Monitoring System (With Auto Idle Stop System), .

DTC (PGM-FI)

1. Connector visual check

   -1. Check for poor connections or loose terminals at these locations:

   • MAF sensor/IAT sensor
   • ECT sensor 1
   • ECT sensor 2

   Are the connections and terminals OK?

   YES 

   Go to step 2.

   NO 

   Repair the connections or terminals.

2. IAT sensor performance check (low temperature)

   -1. Disconnect the following connector.

   MAF sensor/IAT sensor 5P connector

   - 2. Remove the MAF sensor/IAT sensor.

   - 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 vehicle to the ON mode.

   - 7. Quickly note the value of the IAT SENSOR (1) in the DATA LIST with the HDS.

   Signal	Current conditions
   	Values	Unit
   IAT SENSOR (1)

   - 8. Compare the value of the IAT SENSOR (1) to the ambient temperature.

   Does the value of the IAT SENSOR (1) differ 5.4 °F (3 °C) or more from the ambient temperature?

   YES 

   Replace the MAF sensor/IAT sensor .

   NO 

   Go to step 3.

3. IAT sensor performance check (high temperature)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   MAF sensor/IAT sensor 5P connector

   - 3. 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.

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

   - 5. Check the parameter (s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   IAT SENSOR (1)

   Does the IAT SENSOR (1) 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. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   NO 

   Replace the MAF sensor/IAT sensor .