DTC P0103: Mass Or Volume Air Flow Sensor "A" Circuit High: Notes

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Engine stall
• Poor driving performance

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DATA MONITOR  .
   1. Start the engine.
   2. Using the Subaru Select Monitor, read the value in [Air Flow Rate from Mass Air Flow Sensor].
      NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON(DIAG)>DATA MONITOR .

   Is the value of [Mass Air Flow] 232.32 g/s (30.74 lb/m) or more?

   Yes: Go to  2 .

   No: Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2. CHECK FOR POOR CONTACT  .

   Check for poor contact of mass air flow and intake air temperature sensor connector.

   Is there poor contact of mass air flow and intake air temperature sensor connector?

   Yes: Repair the poor contact of mass air flow and intake air temperature sensor connector.

   No: Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .