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Home >> Hyundai >> 2010 >> Azera GLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0685: ECM/PCM Power Relay Control Circuit Open >> Inspection/Repair >> W/Harness Inspection >> Control Circuit Inspection
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Control Circuit Inspection

  1. Check short in coil control
    1. IG "OFF".
    2. Disconnect Main Relay and PCM connector.
    3. Measure resistance between harness terminal 4 and chassis ground.
    4. Measure resistance between harness terminal 4 and 5 of Main Relay.

      Specification:  Infinite

      Fig 1: Measuring Resistance Between Harness Terminal 4 And 5 Of Main Relay
      G06804585Courtesy of HYUNDAI MOTOR CO.
    5. Is the measured voltage within specification?

      YES 

      • Go to " 2 Check open in coil control" as follows.

      NO 

  2. Check open in coil control
    1. IG "OFF".
    2. Disconnect Main Relay and PCM connector.
    3. Measure resistance between harness terminal 4 of Main Relay and harness terminal 43 of PCM harness connector.

      Specification:  Approx. below 1Ω

      Fig 2: Measuring Resistance Between Harness Terminal 4 Of Main Relay And Harness Terminal 43 Of PCM Harness Connector
      G06804586Courtesy of HYUNDAI MOTOR CO.
    4. Is the measured resistance within specification?

      YES 

      NO