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Pinpoint Test B: P0645:00, P2CFC:00, P2CFD:00, P2CFE:00

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Wiring Diagrams MANUAL CLIMATE CONTROL SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    Voltage is provided to the A/C clutch SMART (FET) at all times. The A/C clutch SMART (FET) is a non serviceable part of the printed circuit board on the BCMC [also known as BJB].

    When A/C is requested and A/C line pressures and all conditions allow, the PCM provides a ground to the A/C clutch SMART (FET) control circuit, energizing the A/C clutch SMART (FET). For additional information on A/C Request, REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0645:00 A/C Clutch Relay Control Circuit: No Sub Type Information Sets when the PCM grounds the SMART (FET) circuit and more current than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and voltage is detected on the relay circuit.
    BCMC P2CFC:00 A/C Clutch Control Circuit: No Sub Type Information BCMC reports the clutch control circuit is open.
    BCMC P2CFD:00 A/C Clutch Control Circuit Low: No Sub Type Information BCMC reports the clutch control circuit is shorted to ground.
    BCMC P2CFE:00 A/C Clutch Control Circuit High: No Sub Type Information BCMC reports the clutch control circuit is shorted to power.

    Possible Sources 

    • Fuse
    • Wiring, terminals or connectors
    • A/C clutch SMART (FET) [non-serviceable, part of BCMC also known as BJB]
    • PCM
    • BCMC

  2. NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

  3. B1 CHECK THE A/C (AIR CONDITIONING) CLUTCH FET CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect BJB C1035B.

    • Disconnect PCM, 2.7L C1232B, 3.3L C1551B, 3.5L C175B, 5.0L C1381B or 3.0L Power Stroke Diesel C1233B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560313Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  B2

  4. B2 CHECK THE A/C (AIR CONDITIONING) CLUTCH FET CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B3
    No  REPAIR the circuit.

  5. B3 CHECK THE A/C (AIR CONDITIONING) CLUTCH FET CONTROL CIRCUIT FOR AN OPEN

    • Measure:

      2.7L 

      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 C1232B-44

      3.3L 

      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 C1551B-44

      3.5L 

      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 C175B-44

      5.0L 

      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 C1381B-44

      3.0L Power Stroke Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1035B-29
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 C1233B-68

    Is the resistance less than 3 ohms? 

    Yes  GO to  B4
    No  REPAIR the circuit.

  6. B4 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL GROUND CIRCUIT FOR AN OPEN

    • Disconnect A/C clutch and A/C clutch field coil C100.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C100-2
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  B5
    No  REPAIR the circuit.

  7. B5 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Disconnect BJB C1035C.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035C-5
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 C100-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  B6
    No  REPAIR the circuit.

  8. B6 CHECK THE AIR CONDITIONING CLUTCH FET OPERATION

    • Connect PCM, 2.7L C1232B, 3.3L C1551B, 3.5L C175B, 5.0L C1381B or 3.0L Power Stroke Diesel C1233B.

    • Connect BJB C1035B.

    • Connect BJB C1035C.

    • Ignition ON.

    • Access the PCM and monitor the ACC_CMDPID

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C100-1
      GFD560313Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
    No  CLEAR codes, CARRY OUT the PCM self-test and the BCMC self-test. If Diagnostic Trouble Code P0645:00 returns, GO to  B7 If Diagnostic Trouble Codes P2CFC:00, P2CFD:00 or P2CFE:00 returns, GO to  B8

  9. B7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect all PCM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to PCM GUIDED ROUTINE TESTING
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  10. B8 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all BCMC electrical connectors.

    • Repair:

      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary

    • Connect all BCMC electrical connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC [also known as BJB]. REFER to: Body Control Module C (BCMC) .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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