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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC P0645, P0646 or P0647: Air Conditioning (A/C) Compressor Clutch Relay Control Circuit >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the Q2 A/C Compressor Clutch engages and disengages when commanding the ECM A/C Compressor Clutch Relay On and Off with a scan tool.
    • If the Q2 A/C Compressor Clutch does not engage or disengage 

      Refer to Circuit/System Testing.

    • If the Q2 A/C Compressor Clutch engages and disengages 
  3. All OK.
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