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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - DATC >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> PINPOINT TEST N : The Air Conditioning (A/C) Is Always On - A/C Compressor Does Not Cycle >> PINPOINT TEST N : The Air Conditioning (A/C) Is Always On - A/C Compressor Does Not Cycle

PINPOINT TEST N : The Air Conditioning (A/C) Is Always On - A/C Compressor Does Not Cycle

  1. N1 CHECK THE PCM FOR DTCs

    • Ignition ON.
    • Using a diagnostic scan tool, perform a PCM self-test.

    Is DTC P0645:00 present? 

    Yes  Go to Pinpoint Test B .
    No  GO to  N2.

  2. N2 CHECK THE A/C COMPRESSOR CLUTCH ENGAGEMENT WITH RELAY DISCONNECTED

    • Ignition OFF.
    • Disconnect: A/C Clutch Relay.
    • KOER.
    • With the engine running, observe the A/C compressor clutch.

    Is the A/C compressor on? 

    Yes  GO to  N3.
    No  GO to  N5.

  3. N3 CHECK THE POWER CIRCUIT TO THE A/C CLUTCH FOR A SHORT TO POWER

    • Ignition OFF.
    • Disconnect: A/C Clutch Relay.
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      A/C Clutch Relay Socket Pin 5
      GFD36852Courtesy of FORD MOTOR COMPANY
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  N4.

  4. N4 CHECK THE A/C COMPRESSOR CLUTCH AIR GAP

    • Ignition OFF.
    • Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley.
    1. GFD36853Courtesy of FORD MOTOR COMPANY

    Is the A/C compressor clutch air gap less than 0.35 mm (0.0138 in)? 

    Yes  ADJUST the A/C compressor clutch gap. Refer to Air Conditioning (A/C) Clutch Air Gap Adjustment .
    No  INSTALL a new A/C compressor. Refer to Air Conditioning (A/C) Compressor - 3.5L Ti-VCT  or Refer to Air Conditioning (A/C) Compressor - 2.0L GTDI .

  5. N5 CHECK THE A/C CLUTCH RELAY FUNCTIONALITY

    • Using a known good A/C clutch relay, check the A/C compressor clutch for correct operation.

    Is the A/C compressor on? 

    Yes  INSTALL a new A/C clutch relay.
    No  GO to  N6.

  6. N6 CHECK FOR CORRECT PCM 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 the 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 TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to Electronic Engine Controls - 2.0L GTDI, REFER to Electronic Engine Controls - 3.5L GTDI or REFER to Electronic Engine Controls - 3.5L Ti-VCT.
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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