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Pinpoint Test J: The A/C (Air Conditioning) Is Always On -- A/C (Air Conditioning) Mode Always Commanded On

  1. Refer to Wiring Diagrams MANUAL CLIMATE CONTROL SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    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 P1464:00 A/C Demand Out Of Self Test Range: No Sub Type Information PCM senses an A/C request during a self-test.

    Possible Sources 

    • Wiring, terminals or connectors
    • A/C pressure transducer
    • Evaporator temperature sensor
    • HVAC control module
    • PCM

    Visual Inspection and Pre-checks 

    • Inspect for loose or corroded PCM or HVAC control module connections.

  2. J1 RECHECK THE PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Make sure the HVAC control module is powered off.

    • Using a diagnostic scan tool, clear the PCM Diagnostic Trouble Codes (DTCs).

    • Using a diagnostic scan tool, carry out the PCMKOEO self-test.

    Does DTC P1464 return? 

    Yes  GO to  J2
    No  IGNORE the DTC and CONTINUE diagnosing other Diagnostic Trouble Codes (DTCs) or symptoms. GO to the PCM DTC Chart  or Symptom Chart - Climate Control Systems .

  3. J2 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect A/C compressor clutch field coil C100.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C100-1
      GFD572858Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  J3

  4. J3 COMPARE THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE EVAPORATOR TEMPERATURE (EVAP_TEMP) PID (PARAMETER IDENTIFICATION) TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PID (PARAMETER IDENTIFICATION)

    • Ignition OFF.

    • Allow the vehicle exterior and interior to stabilize to the outside ambient temperature.

    • Ignition ON.

    • Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

    • Monitor and record the PCMPID AAT.

    • Using a diagnostic scan tool, view the HVAC control module Parameter Identification (PIDs).

    • Monitor and record the HVAC control module PID EVAP_TEMP.

    Are the temperature values similar (typically within 18 deg.C (32.4 deg.F))? 

    Yes  GO to  J4
    No  GO to Pinpoint Test D 

  5. J4 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR (ACP_PRESS) PARAMETER IDENTIFICATION (PID)

    • Ignition ON.

    • Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

    • With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM Parameter Identification (PID) ACP_PRESS.

    Are the pressure values of the manifold gauge set and the ACP_PRESS PCMPID within +/- 103 kPa (15 psi)? 

    Yes  GO to  J5
    No  GO to Pinpoint Test B 

  6. J5 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE A/C (AIR CONDITIONING) SWITCH STATUS (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) OFF

    • Ignition ON.

    • Using a diagnostic scan tool, monitor the HVAC control module CC_SW_AC PID.

    • Using the HVAC controls, select PANEL then press and release the A/C button (indicator off).

    Does the PID display On when the A/C button is pressed and Off when released? 

    Yes  GO to  J6
    No  GO to  J8

  7. J6 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) OFF

    • Using a diagnostic scan tool, monitor the PCM AC_REQ PID.

    • Using the HVAC controls, deactivate the A/C.

    Does the PID display OFF? 

    Yes  GO to  J8
    No  GO to  J7

  8. J7 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE DISCONNECTED

    • Ignition OFF.

    • Disconnect HVAC control module C228A.

    • Ignition ON.

    • Using a diagnostic scan tool, monitor the PCM AC_REQ PID.

    Does the PID display OFF? 

    Yes  GO to  J8
    No  GO to  J9

  9. J8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

    • 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 HVAC control module 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 HVAC control module. REFER to the appropriate procedure in REMOVAL AND INSTALLATION .
    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.

  10. J9 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM electrical connectors (if not previously disconnected).

    • 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 PCM 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, Refer to PCM GUIDED ROUTINE TESTING
    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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