CHECK FRONT OXYGEN (A/F) SENSOR HEATER CURRENT.

1) Turn the ignition switch to OFF.

2) Repair the short to power supply in the harness between ECM and front oxygen (A/F) sensor connector.

3) Turn the ignition switch to ON.

4) Read the data of front oxygen (A/F) sensor heater current 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 current 2.3 A or more?

Yes No

Replace the ECM.

END.