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 intake air temperature sensor signal using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

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

• General scan tool

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

QUESTION

Is the temperature less than −36°C (−33°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.