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Check Engine Control Module (ECM)

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK ECM SIGNAL. 
  1. Start the engine.
  2. 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 for H4SO engine. > <Ref. to BASIC DIAGNOSTIC PROCEDURE for H4DOTC engine. >
2 CHECK HARNESS BETWEEN COMBINATION METER AND ECM. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM and combination meter.
  3. Measure the resistance between ECM harness connector and combination meter harness connector.

Connector & terminal 

(B136) No. 22 - (i10) No. 32: 

 Is resistance less than 10 Ω? Replace the meter case assembly. Repair the wiring harness.
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