DTC P0647:00 [Pcm (SKYACTIV-G)]: Outline

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DTC P0647:00 (PCM, SKYACTIV-G) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	A/C compressor magnetic clutch circuit high input
Detection condition	The A/C compressor magnetic clutch control voltage at the PCM terminal 2AF is high for a continuous 5 s relative to the PCM control signal.
Fail-safe	Release the magnetic clutch.
Possible cause	A/C relay malfunction PCM connector or terminals malfunction Short to power supply in A/C relay control circuit PCM malfunction
Courtesy of MAZDA MOTORS CORP.