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Home >> Subaru >> 2004 >> Forester XT, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Instrumentation - Driver Info) >> Combination Meter System >> Inspection >> Check Engine Control Module (ECM)

Check Engine Control Module (ECM)

WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
CHECKING ENGINE CONTROL MODULE (ECM)

Step Check Yes No
1 CHECK ECM SIGNAL. 
  1. Start the engine.
  2. Measure the voltage between ECM connector and engine ground.

Connector & terminal 
Non-turbo model 
(B135) No. 27 (+) - Engine ground (-): 
Turbo model 
(B135) No. 26 (+) - Engine ground (-): 		 Is the voltage 0 V > 14 V? Go to step 2  . Check ECM. < Ref. to BASIC DIAGNOSTIC PROCEDURE (H4SO) . >
< Ref. to BASIC DIAGNOSTIC PROCEDURE (H4DOTC) . >
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 
Non-turbo model 
(B135) No. 27 - (i10) No. 12: 
Turbo model 
(B135) No. 26 - (i10) No. 12: 		 Is the resistance less than 10 ohm? Check the tachometer. < Ref. to REMOVAL , Tachometer. > Repair the wiring harness.
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