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Home >> Chrysler >> 2002 >> PT Cruiser Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0647: A/C Clutch Relay Control Circuit High >> Testing
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DTC P0647: A/C Clutch Relay Control Circuit High: Testing

  1. Turn the ignition on. With the DRBIII®, actuate the A/C Clutch Relay. Is the A/C Clutch Relay operating? If yes, go to next step. If no, go to step  4.
  2. With the DRBIII®, actuate the A/C Clutch Relay. Wiggle the wiring harness from the A/C Clutch Relay to the PCM while the relay is actuating. Did the A/C Clutch Relay stop when wiggling the wiring harness? If yes, repair as necessary. If no, go to next step.
    3. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  3. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
  4. Turn the ignition off. Remove the A/C Clutch Relay from the PDC. Disconnect the PCM C2 harness connector. Measure the voltage in the A/C Clutch Relay Control circuit in the PDC. Is the voltage above 1.0 volt? If yes, repair the A/C Clutch Relay Control circuit for a short to B+. If no, go to next step.
  5. There are no possible causes remaining, replace the PCM. Program the new PCM. See PROGRAMMING .
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