DTC P0111 Intake Air Temperature Sensor Range/Performance Problem: Notes

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Improper idling
Poor driving performance

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO) > Clear Memory Mode > OPERATION , and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO) > Inspection Mode > PROCEDURE .

WIRING DIAGRAM:

Engine Electrical System NON-TURBO MODEL (WITHOUT PUSH BUTTON START) Ref. to WIRING SYSTEM > Engine Electrical System > NON-TURBO MODEL (WITHOUT PUSH BUTTON START) .
Engine Electrical System NON-TURBO MODEL (WITH PUSH BUTTON START) Ref. to WIRING SYSTEM > Engine Electrical System > NON-TURBO MODEL (WITH PUSH BUTTON START) .

Fig 1: Engine Electrical System Non-Turbo Model Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

CHECK FOR ANY OTHER DTC ON DISPLAY .
Is any other DTC displayed?

Yes: Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO) > List of Diagnostic Trouble Code (DTC) .

No: Go to 2 .
CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .
1. Disconnect the connectors from the mass air flow and intake air temperature sensor.
2. Measure the resistance between the mass air flow and intake air temperature sensor terminals when the engine is cold and after warmed up.
  Terminals
  
  No. 1 - No. 2:
Is the resistance of the mass air flow and intake air temperature sensor different between when engine is cold and after warmed up?

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) (H4DO) > MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .