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

1) Turn the ignition switch to OFF.

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

3) Start the engine.

4) Read the data of air flow sensor signal using the Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

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

• General scan tool

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

QUESTION
Is the voltage 5 V or more?
Yes	No
Repair the short circuit of harness to power supply between ECM connector and the mass air flow and intake air temperature sensor connector.