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Home › Subaru › 2016 › BRZ Series.HyperBlue › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnostics (3 Of 3) › DTC P0685 Main Relay ON Stuck › Inspection steps

Inspection steps

  1. Check ECM connector
    1. Check the connection of the ECM connector.

      Result

      Result Go to
      Not connected A
      Connected B

      B: Connect the connector properly.

      A: Go to next step

  2. Check ECM input voltage.
    1. Turn the ignition switch to OFF.
    2. Measure the voltage between ECM connector and chassis ground.
      Inspection terminals Inspection conditions Standard value
      A35-1 (+B) - chassis ground IG OFF 0 V

      NG: Recheck the harness and connector for a poor contact. If no poor contact is found, replace the ECM.

      OK: Repair harness and connector.

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