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.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0111 IAT Sensor Circuit Range/Performance Problem
     

1.
Connector visual check:

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, then do the repair verification.
2.
IAT sensor performance check (low temperature):

IAT sensor performance check (low temperature)
?1.
Disconnect the following 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.
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.
Signal
Current conditions
Values
Unit
IAT SENSOR (2)
    

?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
     
     
     
     
NO
     
     
     
Go to step 3.
3.
IAT sensor performance check (high temperature):

IAT sensor performance check (high temperature)
?1.
Disconnect the following connector.

?2.
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.

?3.
Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.

?4.
Check the IAT SENSOR in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
IAT SENSOR (2)
    

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
     
     
     
Repair verification:

?1.
Press the engine start/stop button to select the ON mode.

?2.
Reset the PCM with the HDS.


?3.
Do the PCM idle learn procedure.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0111 IAT Sensor Circuit Range/Performance Problem
      


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. ?