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Home >> Kia >> 2008 >> Sedona Base >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures (2 Of 2) >> DTC P0646 A/C Clutch Relay Control Circuit Low >> Component Inspection

Component Inspection

  1. Check A/C relay
  2. IG "OFF".
  3. Disconnect A/C relay.
  4. Measure the resistance between terminal 2 and 3 of A/C relay.
  5. Measure the resistance between terminal 1 and 4 of A/C relay.
    RESISTANCE SPECIFICATION CHART

    Terminal Power approval
    1-4 NO
    2-3 YES
    (About 70-120Ω)
    Fig 1: Measuring Resistance Between Terminal 1 And 4 Of A/C Relay
    G04883533Courtesy of KIA MOTORS AMERICA, INC.
  6. 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.

    NO 

    • Substitute with a known-good A/C relay and check for proper operation. If the problem is corrected, replace A/C relay and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NOTE: There is a memory reset function on scan tool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others
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