DTC Troubleshooting: P0111, P011B
DTC P0111: IAT Sensor Circuit Range/Performance Problem
DTC P011B: IAT Sensor Circuit Range/Performance Problem
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0111 IAT Sensor Circuit Range/Performance Problem
    
P011B 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.?
2.
IAT sensor performance check (low temperature):

IAT sensor performance check (low temperature)
?1.
Disconnect the following connector.
MAF sensor/IAT sensor 4P 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 4P 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
     
     
     
     
NO
     
     
     
Go to step 3.
3.
IAT sensor performance check (high temperature):

IAT sensor performance check (high temperature)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
MAF sensor/IAT sensor 4P 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 4P 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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
     
NO