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Home >> Hyundai >> 2015 >> Equus Ultimate >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0685: ECM/PCM Power Relay Control Circuit/Open >> Wiring Inspection >> Power Circuit Inspection

Power Circuit Inspection

  1. IG "OFF" and disconnect the main relay.
  2. IG "ON".
  3. Measure the voltage between power supply terminals of main relay harness connector and chassis ground.

    Specification:  B+

  4. Is the measured voltage within specification?

    YES 

    NO 

    • Check the fuse between battery and main relay.
    • Repair open or short to ground in power harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.