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HOMESERVICE MANUALSSUBARU2004OUTBACK LIMITED, 4D SEDAN, EJ259REPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENTATION - DRIVER INFOCOMBINATION METER SYSTEMINSPECTIONCHECK ENGINE CONTROL MODULE
2004 Subaru Outback Limited, 4D Sedan, EJ259

Check Engine Control Module

2004 Subaru Outback Limited, 4D Sedan, EJ259SECTION Check Engine Control Module
ENGINE CONTROL MODULE CHART

Step Check Yes No
1 CHECK ENGINE CONTROL MODULE SIGNAL. 
  1. Start the engine.
  2. Measure voltage between engine control module connector and engine ground.

    Connector & terminal 

    1. H4 with TURBO: 

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

    2. H6 model: 

      (B136) No. 9 (+) - Engine ground (-): 

    3. H4 NA U5 model: 

      (B137) No. 9 (+) - Engine ground (-): 

    4. H4 NA model (Except U5 model): 

      (B134) No. 10 (+) - Engine ground (-): 

 Is the measured value within 0 V to 14 V? Go to step 2  . Check engine control module. < Ref. to BASIC DIAGNOSTIC PROCEDURE or BASIC DIAGNOSTIC PROCEDURE or BASIC DIAGNOSTIC PROCEDURE or BASIC DIAGNOSTIC PROCEDURE .
2 CHECK HARNESS BETWEEN COMBINATION METER AND ENGINE CONTROL MODULE. 
  1. Turn ignition switch to OFF.
  2. Disconnect connector from engine control module and combination meter.
  3. Measure resistance between engine control module harness connector and combination meter harness connector.

    Connector & terminal 

    1. H4 with TURBO: 

      (B134) No. 23 - (H1) No. 7: 

    2. H6 model: 

      (B136) No. 9 - (H1) No. 7: 

    3. H4 NA U5 model: 

      (B137) No. 9 - (H1) No. 7: 

    4. H4 NA model (Except U5 model): 

      (B134) No. 10 - (i11) No. 7: 

 Is the measured value less than 10 ohm? Check tachometer. < Ref. to REMOVAL  . > Repair wiring harness.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.