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Check Engine Control Module (ECM)

ENGINE CONTROL MODULE (ECM) CHECK STEP

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

    Connector & terminal 

    Except STI model: 

    (B136) No. 22 (+) - Chassis ground (-): 

    STI model: 

    (B134) No. 23 (+) - Chassis ground (-): 

 Is the voltage 0 ←→ 14 V or more? Go to step 2.  Check the ECM. < Ref. to BASIC DIAGNOSTIC PROCEDURE . > or < Ref. to BASIC DIAGNOSTIC PROCEDURE . > or < Ref. to ENGINE (DIAGNOSTICS) (STI) article . >
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 

    Except STI model: 

    (B136) No. 22 - (i11) No. 5: 

    STI model: 

    (B134) No. 23 - (i11) No. 5: 

 Is the resistance less than 10 Ω? Except STI model: Check the tachometer. < Ref. to REMOVAL , Tachometer. > STI model: Replace the meter main assembly. Repair the wiring harness.
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