CHECK HARNESS BETWEEN MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR AND ECM CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the mass air flow and intake air temperature sensor.

3) Turn the ignition switch to ON.

4) Read the data of mass air flow and intake air temperature sensor signal using Subaru Select Monitor.

NOTE:

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

QUESTION

Is the intake air temperature less than −40°C (−40°F) ?

Yes No

Replace the mass air flow and intake air temperature sensor.

Repair the ground short circuit of harness between mass air flow and intake air temperature sensor and ECM connector.