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Home >> Hyundai >> 2017 >> Santa Fe XL Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0685: ECM/PCM Power Relay Control Circuit/Open >> Component Inspection >> Check Fuel Pump Relay
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Check Fuel Pump Relay

  1. Substitute with a known - good EMS BOX and check for proper operation.
  2. Connect GDS to Data Link Connector (DLC).
  3. IG "ON".
  4. Perform "Actuation Test" for Main Relay.
  5. Does the Main Relay work normally? (Check clicking sound)

    YES 

    • Substitute with a known-good EMS Box and check for proper operation. If the problem is corrected, replace EMS Box and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between PCM and component thoroughly. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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