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Home >> Hyundai >> 2010 >> Azera Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0646: A/C Clutch Relay Control Circuit Low >> Inspection/Repair >> Control Circuit Inspection

Control Circuit Inspection

  1. Check short in harness
    1. IG "OFF".
    2. Disconnect A/C relay and PCM connector.
    3. Measure the resistance between terminal 3 of A/C relay harness connector and chassis ground.

      Specification:  Infinite

      Fig 1: Measuring Resistance Between Terminal 3 Of A/C Relay Harness Connector And Chassis Ground
      G06804565Courtesy of HYUNDAI MOTOR CO.
    4. Is the measured resistance within specification?

      YES 

      • Go to " 2 Check open in harness" as follows.

      NO 

  2. Check open in harness
    1. IG "OFF".
    2. Disconnect A/C relay and PCM connector.
    3. Measure the resistance between terminal 3 of A/C relay harness connector and terminal 64 of PCM harness connector

      Specification:  Approx. below 1Ω

      Fig 2: Measuring Resistance Between Terminal 3 Of A/C Relay Harness Connector And Terminal 64 Of PCM Harness Connect
      G06804566Courtesy of HYUNDAI MOTOR CO.
    4. Is the measured resistance within specification?

      YES 

      NO