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HOMESERVICE MANUALSSUBARU2014LEGACY 2.5I, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESPARKING BRAKE SYSTEMPARKING BRAKE SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C0251 ACTUATOR LINE (ABNORMAL)DIAGNOSTIC PROCEDURE
2014 Subaru Legacy 2.5i, Automatic CVT Trans

Diagnostic Procedure

2014 Subaru Legacy 2.5i, Automatic CVT TransSECTION Diagnostic Procedure
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK INPUT VOLTAGE FOR ELECTRONIC PARKING BRAKE CM. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from the electronic parking brake CM.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between electronic parking brake CM connector and chassis ground.

    Connector & terminal 

    (R355) No. 18 (+) - Chassis ground (-): 

    (R355) No. 17 (+) - Chassis ground (-): 

 Is the voltage 10 - 15 V? Go to step 2  . Repair the power supply circuit.
2 CHECK GROUND CIRCUIT OF ELECTRONIC PARKING BRAKE CM. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between electronic parking brake CM connector and chassis ground.

    Connector & terminal 

    (R355) No. 6 - Chassis ground: 

 Is the resistance less than 10 Ω? Go to step 3  . Repair the defective ground circuit of the electronic parking brake CM.
3 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact of power supply circuit, ground circuit and electronic parking brake CM connector? Repair the connector. Go to step 4  .
4 CHECK ELECTRONIC PARKING BRAKE CM. 
  1. Connect all connectors.
  2. Clear the memory. < Refer to CLEAR MEMORY MODE . >
  3. Perform the Inspection Mode. < Refer to INSPECTION MODE . >
  4. Release the parking brake, and then operate again.
  5. Read the DTC.
 Is the same DTC displayed? Replace the electronic parking brake CM. < Refer to PARKING BRAKE ACTUATOR . > Go to step 5  .
5 CHECK OTHER DTC DETECTION.  Is any other DTC displayed? Perform the diagnosis according to DTC. It results from a temporary poor contact interference.
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.