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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control System - General Information (2 Of 2) >> Diagnosis And Testing >> Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) >> Pinpoint Tests >> Pinpoint Test I: The A/C (Air Conditioning) Is Inoperative

Pinpoint Test I: The A/C (Air Conditioning) Is Inoperative

  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 .

    Possible Sources 

    • Wiring, terminals or connectors
    • A/C system discharged or low refrigerant charge
    • Network concerns
    • A/C pressure transducer
    • Evaporator temperature sensor
    • Intake Air Temperature (IAT) / Mass Air Flow (MAF) sensor
    • A/C compressor clutch air gap
    • A/C compressor clutch field coil
    • A/C clutch relay (non-serviceable, part of the BJB)
    • HVAC control module

    Visual Inspection and Pre-checks 

    • Verify BJB fuse 53 (10A) is OK.

  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
  3. NOTE: Some PCM Diagnostic Trouble Codes (DTCs) may inhibit A/C operation. If any PCM Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the DTC Chart: PCM.

  4. I1 CHECK THE A/C (AIR CONDITIONING) SYSTEM PRESSURE

    NOTE: Static refrigerant pressure, under perfect conditions, should approximately reflect ambient air temperature. Do not rely upon the static refrigerant pressure alone to determine if the system is properly charged. Refer to the current Ford Web Based Technical Training courses for basic HVAC system refrigerant operation.

    • Ignition OFF.

    • With a manifold gauge set connected, check for minimum A/C system pressure.

    Is the A/C system pressure above 290 kPa (42 psi)? 

    Yes  GO to  I2
    No  CHECK the A/C system for leaks. REFER to the appropriate GENERAL PROCEDURES . RECHARGE the A/C system. REFER to the appropriate GENERAL PROCEDURES .

  5. I2 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    Do the HVAC control module and the PCM pass the network test? 

    Yes  GO to  I3
    No  DIAGNOSE the HVAC control module or PCM does not communicate with the diagnostic scan tool. REFER to: Communications Network .

  6. I3 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) PRESSURE SENSOR (ACP_PRESS) PID (PARAMETER IDENTIFICATION)

    • Ignition ON.

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

    • With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the ACP_PRESS PID.

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

    Yes  GO to  I4
    No  DIAGNOSE the A/C pressure transducer. GO to Pinpoint Test B 

  7. I4 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, monitor and record the PCM AAT PID.

    • Using a diagnostic scan tool, monitor and record the HVAC control module EVAP_TEMP PID.

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

    Yes  GO to  I5
    No  DIAGNOSE the evaporator temperature sensor. GO to Pinpoint Test D 

  8. I5 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) INTAKE AIR TEMPERATURE (IAT) PID (PARAMETER IDENTIFICATION) AND THE OTHER TEMPERATURE SENSOR READINGS TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PID (PARAMETER IDENTIFICATION)

    NOTE: Compare multiple engine sensor readings to the ambient temperature to determine sensors are reading correctly. A faulty sensor can cause the PCM to disable the A/C with or without a DTC.

    • Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.

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

    • Monitor the AAT, CACT, CHT, ECT, IAT, IAT2, MAF, MAPT, TCB and TCIPT Parameter Identifications (PIDs) (as applicable).

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

    Yes  GO to  I6
    No  DIAGNOSE the suspect temperature sensor. REFER to DIAGNOSIS AND TESTING for Ambient Air Temperature (AAT) sensor or Outside Air Temperature Display concerns. For all other temperature sensor concerns, REFER to ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) .

  9. I6 RESET THE AMBIENT AIR TEMPERATURE (AAT) SENSOR

    • On the HVAC controls, press the A/C (air conditioning) and Recirc buttons simultaneously, then release both. Within 2 seconds press A/C button again.

    • Start the engine.

    • On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

    Does the A/C compressor turn on? 

    Yes  TEST the A/C system for normal operation. REFER to the appropriate Refrigerant System Tests general procedure in REMOVAL AND INSTALLATION .
    No  GO to  I7

  10. I7 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE A/C (AIR CONDITIONING) SWITCH (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON

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

    • On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

    Does the PID display ON when the button is pressed? 

    Yes  GO to  I8
    No  GO to  I14

  11. I8 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON

    • Start the engine.

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

    • On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

    Does the PID display ON or Yes when the button is pressed? 

    Yes  GO to  I9
    No  GO to  I14

  12. I9 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) COMPRESSOR COMMANDED STATE (ACC_CMD) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) COMMANDED ON

    • Using a diagnostic scan tool, activate the PCM ACC_CMD PID.

    Does the A/C compressor turn on? 

    Yes  GO to  I15
    No  GO to  I10

  13. I10 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY COIL CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1235B (1.5L), C1915B (2.0L) or C175B (2.5L).

    • Disconnect BJB C1035B.

    • For vehicles equipped with a 1.5L engine, measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-21
      GFD572859Courtesy of FORD MOTOR COMPANY
      		 C1235B-2

    • For vehicles equipped with a 2.0L engine, measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-21
      GFD572859Courtesy of FORD MOTOR COMPANY
      		 C1915B-62

    • For vehicles equipped with a 2.5L engine, measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-21
      GFD572859Courtesy of FORD MOTOR COMPANY
      		 C175B-58

    Is the resistance less than 3 ohms? 

    Yes  GO to  I11
    No  REPAIR the circuit.

  14. I11 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Disconnect A/C clutch field coil C100.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-32
      GFD572859Courtesy of FORD MOTOR COMPANY
      		 C100-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  I12
    No  REPAIR the circuit.

  15. I12 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C100-2
      GFD572859Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  I13
    No  REPAIR the circuit.

  16. I13 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH AIR GAP

    • Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley. REFER to the appropriate GENERAL PROCEDURES .

    Is the A/C compressor clutch air gap greater than 0.6 mm (0.0236 in)? 

    Yes  ADJUST the A/C compressor clutch air gap. REFER to the appropriate GENERAL PROCEDURES .
    No  INSTALL a new A/C compressor clutch and field coil. REFER to the appropriate GENERAL PROCEDURES .

  17. I14 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 a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  18. I15 CHECK FOR AN INPUT DISABLING THE A/C (AIR CONDITIONING) CLUTCH RELAY

    NOTE: The PCM strategy may disable the A/C compressor operation. If the A/C compressor clutch can be commanded on using IDS PCM Parameter Identifications (PIDs) Active Commands, PCM replacement will not resolve the condition.

    • Diagnose the PCM not energizing the A/C clutch relay using the suggestions in the table below. Refer to the reference value information in ENGINE CONTROLS - REFERENCE VALUES (EXCEPT DIESEL & HYBRID) (1 OF 2) or ENGINE CONTROLS - REFERENCE VALUES (EXCEPT DIESEL & HYBRID) (2 OF 2) .
      A/C Clutch Engagement is inhibited because strategy has not yet detected hardware that indicates vehicle is equipped with A/C
      A/C Clutch Engagement is inhibited because the strategy is operating in Ignition System Failure Mode
      A/C Clutch Engagement is inhibited because the (ECU) received a Request to Command the A/C Off
      A/C Clutch Engagement is inhibited because the engine has not yet reached a stable running mode after starting
      A/C Clutch Engagement is inhibited because the A/C Discharge (Head) Pressure is Too High
      A/C Clutch Engagement is inhibited because the Engine Coolant Temperature is Too High
      A/C Clutch Engagement is inhibited to Prevent Frost and Ice Build Up on the Evaporator
      A/C Clutch Engagement is inhibited to Prevent an Engine Stall during a Low Engine Speed condition
      A/C Clutch Engagement is inhibited to Protect the Compressor from a Compressor Over-speed condition
      A/C Clutch Engagement is inhibited to temporarily make more power available when Accelerator Pedal is Fully Depressed
      A/C Clutch Engagement is inhibited because Low A/C Refrigerant Charge has been detected
      A/C Clutch Engagement is inhibited to Protect the Compressor from Operating at Too Low of an Ambient Temperature
      A/C Clutch Engagement is inhibited due to Missing Climate Control Message
      A/C Clutch Engagement is inhibited because the strategy is operating in Failsafe Cooling Mode
      A/C Clutch Engagement is inhibited to Protect the Clutch from Damage because the Compressor Load and Speed are Too High
      A/C Clutch Engagement is inhibited by the off portion of the A/C Cycling Strategy invoked to manage High Engine Temperature
      A/C Clutch Engagement is inhibited due to Low Battery State of Charge
      A/C Clutch Engagement is inhibited to Protect the Variable Displacement Compressor from Operating at Too Low of a Temperature
      A/C Clutch Engagement is inhibited to improve Brake Booster Vacuum
      A/C Clutch Engagement is inhibited because Evaporator Temperature is sufficiently low and compressor was at minimum displacement
      A/C Clutch Engagement is inhibited (Disabled) because the Evaporator Temperature is sufficiently below the target temperature
      A/C Clutch Engagement is inhibited to satisfy A/C Clutch minimum off time
      A/C Clutch Engagement is inhibited Due to Request from Torque Control Strategy (to Temporarily Make More Power Available)
      A/C Clutch Engagement is inhibited to Prevent Engine Stalling
      A/C Clutch Engagement is inhibited Due to Request to Disable A/C from Stop-Start Strategy
      A/C Clutch Engagement is inhibited (Delayed) to make Power Available for Power Steering
      A/C Clutch Engagement Is Inhibited Due To State Of Auxiliary A/C Disable (Typically A Pressure Or Temperature) Switch 1 input
      A/C Clutch Engagement is inhibited due to state of auxiliary A/C Disable (Typically a Pressure or Temperature) Switch 2 input

    Are any of the conditions described above not within normal parameters? 

    Yes  DIAGNOSE the condition found to be disabling the A/C clutch relay. REFER to the appropriate Service Information or the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) .
    No  The A/C compressor clutch can be commanded on using the IDS PCM Active command PID. The A/C inoperative concern may be caused by an intermittent condition due to a component or module connection, wiring or pin issue. ADDRESS the root cause of any connector or pin issues. CHECK the vehicle service history for recent service actions that have replaced modules. This condition may be due to incomplete or incorrect PMI procedures.
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