DTC P0111: Intake Air Temperature Sensor 1 Circuit Range/Performance Bank 1: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

• Improper idling
• Poor driving performance

1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC other than P0111 displayed? (Current code)

Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

No:  Go to  2.

1. Open the hood, and start and idle the engine for 6 minutes or more.
   NOTE:

   • Open the hood to prevent temperature rise in the engine compartment so that inspection is correctly performed.
   • Six minutes or more of idling is necessary to update the value of the intake air temperature.
2. Using the Subaru Select Monitor, read the value in [Intake Air Temperature (B1-S1)].
   NOTE: For detailed operation procedures, refer to "COMMON (DIAGNOSTICS)". Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR .
3. Read the change of the value in [Intake Air Temperature (B1-S1)] while heating and cooling the mass air flow and intake air temperature sensor using a hair dryer.
   WARNING: Be careful not to burn yourself, deform parts, or cause their erosion.

Does the value of [Intake Air Temperature (B1-S1)] change before/after supplying warm air?

Yes:  Go to 3.

No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

Check the mass air flow and intake air temperature sensor.

Is the check result OK?

Yes:  Repair the poor contact of ECM connector.

No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR