Check Engine Control Module (ECM)

WARNING: This page is about a different car, the 2007 Subaru Outback and 2007 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK ECM SIGNAL. Start the engine. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B136) No. 22 (+) - Chassis ground (-):	Is the voltage 0 ↔ 14 V or more?	Go to step 2.	Inspect the ECM. <Ref. to BASIC DIAGNOSTIC PROCEDURE (H4SO). > <Ref. to BASIC DIAGNOSTIC PROCEDURE (H4DOTC). > <Ref. to BASIC DIAGNOSTIC PROCEDURE (H6DO). >
2 CHECK HARNESS BETWEEN COMBINATION METER AND ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM and combination meter. Measure the resistance between ECM harness connector and combination meter harness connector. Connector & terminal (B136) No. 22 - (i10) No. 20:	Is resistance less than 10 Ω?	Replace the meter case assembly.	Repair the wiring harness.