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. CHECK DTC  .

   Read the engine DTC using the Subaru Select Monitor or general scan tool. Ref. to ENGINE (DIAGNOSTICS) (STI)>Read Diagnostic Trouble Code (DTC) .

   Is DTC other than P0111 displayed? (Current malfunction)

   Yes:  Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (STI)>List of Diagnostic Trouble Code (DTC) .

   No:  Go to  2

2. CHECK CURRENT DATA  .
   1. Turn the ignition switch to ON.
   2. Read the value of «Intake Air Temp.» using the Subaru Select Monitor or a general scan tool.
      NOTE:

      • Subaru Select Monitor

        For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to ENGINE (DIAGNOSTICS) (STI)>Subaru Select Monitor .

      • General scan tool

        For detailed operation procedures, refer to the general scan tool operation manual.

   3. Read the change of the value in «Intake Air Temp.» while heating and cooling the mass air flow and intake air temperature sensor using a hair dryer.
      CAUTION: Do not heat the part to the temperature where you cannot touch it with your bare hand in order to prevent burning yourself and protect the part.

   Does the value of «Intake Air Temp.» change between heating and cooling?

   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) (STI)>Mass Air Flow and Intake Air Temperature Sensor .