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

Check Transmission Control Module

2004 Subaru Outback Limited, 4D Sedan, EJ259SECTION Check Transmission Control Module
TRANSMISSION CONTROL MODULE CHART

Step Check Yes No
1 CHECK TRANSMISSION CONTROL MODULE SIGNAL. 
  1. Lift-up the vehicle and support it with safety stands.
  2. Drive the vehicle faster than 10 km/h (6 MPH).
    WARNING: Be careful not to get caught in the running wheels. 
  3. Measure voltage between transmission control module connector and chassis ground.

    Connector & terminal 

    1. H4 with TURBO: 

      (B56) No. 1 (+) - Chassis ground (-): 

    2. H6 with VDC: 

      (B56) No. 17 (+) - Chassis ground (-): 

    3. H6 without VDC: 

      (B55) No. 13 (+) - Chassis ground (-): 

    4. H4 NA U5 with SPORTS SHIFT: 

      (B56) No. 17 (+) - Chassis ground (-): 

    5. H4 NA U5 without SPORTS SHIFT: 

      (B55) No. 8 (+) - Chassis ground (-): 

    6. With SPORTS SHIFT except for H4 NA U5: 

      (B56) No. 17 (+) - Chassis ground (-): 

    7. Without SPORTS SHIFT except for H4 NA U5: 

      (B55) No. 13 (+) - Chassis ground (-): 

 Is the measured value less than 1 V or more than 5 V? Go to step 2. Check transmission control module. < Ref. to BASIC DIAGNOSTIC PROCEDURE or BASIC DIAGNOSTIC PROCEDURE .
2 CHECK HARNESS BETWEEN TRANSMISSION CONTROL MODULE AND COMBINATION METER. 
  1. Turn ignition switch to OFF.
  2. Disconnect connector from transmission control module and combination meter.
  3. Measure resistance between transmission control module harness connector and combination meter harness connector.

    Connector & terminal 

    1. H4 with TURBO: 

      (B56) No. 1 - (i10) No. 13: 

    2. H6 with VDC: 

      (B56) No. 17 - (i10) No. 13: 

    3. H6 without VDC: 

      (B55) No. 13 - (i10) No. 13: 

    4. H4 NA U5 with SPORTS SHIFT: 

      (B56) No. 17 - (i10) No. 13: 

    5. H4 NA U5 without SPORTS SHIFT: 

      (B55) No. 8 - (i10) No. 13: 

    6. With SPORTS SHIFT except for H4 NA U5: 

      (B56) No. 17 - (i10) No. 13: 

    7. Without SPORTS SHIFT except for H4 NA U5: 

      (B55) No. 13 - (i10) No. 13: 

 Is the measured value less than 10 ohm? Check speed meter. < Ref. to REMOVAL  . > Repair wiring harness.
RENDER: 1.0x

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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.