CONNECT SUBARU SELECT MONITOR OR GENERAL SCAN TOOL, AND READ THE DATA.

1) Turn the ignition switch to OFF.

2) Connect the Subaru Select Monitor or general scan tool to data link connector.

3) Turn the ignition switch to ON, and the Subaru Select Monitor or general scan tool power switch to ON.

4) Start the engine.

5) Read the mass air flow sensor voltage 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 voltage 0.2 — 4.7 V?

Yes No

Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. Temporary poor contact of connector or harness may be the cause. Repair the harness or connector in mass air flow sensor.

NOTE:

In this case, repair the following item:

• Open or ground short circuit of harness between mass air flow sensor and ECM connector

• Poor contact in mass air flow sensor or ECM connector