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Home › Hyundai › 2007 › Santa Fe Limited, AWD › 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 the resistance between terminal 30 and 87 of main relay.
    4. Measure the resistance between terminal 85 and 86 of main relay.

      SPECIFICATION : 

      TERMINAL SPECIFICATION

      Terminal continuity
      30 ~ 87 NO
      85 ~ 86 YES (Approx. 70Ω ~ 120Ω)
      Fig 1: Measuring Resistance Between Terminal 30 And 87 Of Main Relay
      G05349736Courtesy of HYUNDAI MOTOR CO.
    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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