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Home >> Hyundai >> 2007 >> Sonata SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3.3L) (2 Of 2) >> DTC Troubleshooting Procedures >> DTC P0685 ECM/Pcm Power Relay Control Circuit/Open >> Component Inspection

Component Inspection

  1. Check Main Relay
    1. IG "OFF"
    2. Disconnect Main Relay
    3. Measure resistance between terminal 5 and 3 of Main Relay
    4. Measure resistance between terminal 4 and 2 of Main Relay.

      SPECIFICATION : 

      TERMINAL CONTINUITY CHART

      Terminal continuity
      3~5 NO
      2~4 YES (Approx. 70Ω ~ 120Ω)
    5. Is the measured resistance within specification ?

    YES 

    • Substitute with a known-good PCM and check for proper operation.

    If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.

    NO 

    • Substitute with a known-good Main Relay and check for proper operation.

    If the problem is corrected, replace Main Relay and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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