CHECK OUTPUT SIGNAL OF ECM.

1) Turn the ignition switch to OFF.

2) Connect the test mode connector at the lower portion of instrument panel (on the driver’s side).

3) Turn the ignition switch to ON.

4) Measure the voltage between ECM and chassis ground while operating the radiator fan relay.

NOTE:

The radiator fan relay can be operated using the Subaru Select Monitor. Regarding the procedures, refer to “Compulsory Valve Operation Check Mode”.

Connector & terminal

(B135) No. 19 (+) — Chassis ground (−):

(B135) No. 27 (+) — Chassis ground (−):

QUESTION
Is the voltage 0 — 10 V?
Yes	No
Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. In this case, repair the poor contact in ECM connector.