Component Inspection

Engine

Engine Control - P0647 A/C Clutch Relay Control Circuit High - Component Inspection

Component Inspection

Check A/C relay
1. IG "OFF"
2. Disconnect A/C Relay
3. Measure resistance between battery power supply and power supply to A/C Compressor terminals of A/C relay. (Measurement "A")
4. Measure resistance between battery power supply and A/C relay control terminals of A/C relay. (Measurement "B")
A. Specification :









5. Is the measured resistance within specification?
YES
1) 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
1) 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 scantool 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