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Home >> Kia >> 2010 >> Sedona Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0685: ECM/PCM Power Relay Control Circuit/Open >> Inspection/Repair >> Component Inspection
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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.
      1. Specification:
        TERMINALS REFERENCE

        Terminal Continuity
        3 ~ 5 NO
        2 ~ 4 YES (Approx. 70Ω ~ 120Ω)
        Fig 1: Measuring Resistance Between Terminal 5 And 3 Of Main Relay
        G06837036Courtesy of KIA MOTORS AMERICA, INC.
    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.
        CAUTION: 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.