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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 627 (Climate Control System - General Information (Diagnosis & Testing - General Procedures)) >> Diagnosis And Testing >> Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) >> Pinpoint Test(s) >> Pinpoint Test A: P0531, P0532, P0533, P0534

Pinpoint Test A: P0531, P0532, P0533, P0534

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

    Normal Operation and Fault Conditions 

    The A/C pressure transducer receives a ground from the PCM. A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM. The A/C pressure transducer then sends a voltage to the PCM to indicate the A/C pressure.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0531:00 A/C Refrigerant Pressure Sensor "A" Circuit Range/Performance: No Sub Type Information Sets if the pressure sensor falls below or exceeds a minimum or maximum calibrated value for a calibrated period of time.
    PCM P0532:00 A/C Refrigerant Pressure Sensor "A" Circuit Low: No Sub Type Information Sets if the feedback voltage is less than 0.26 volt for at least 2 seconds and the ambient air temperature is greater than 0 deg.C (32 deg.F).
    PCM P0533:00 A/C Refrigerant Pressure Sensor "A" Circuit High: No Sub Type Information Sets if the feedback voltage is greater than 4.95 volts for at least 2 seconds and the ambient air temperature is greater than 0 deg.C (32 deg.F).
    PCM P0534:00 A/C Refrigerant System "A" Charge Loss: No Sub Type Information Sets if the pressure sensor signal is lower than the calibrated value.

    Possible Sources 

    • A/C system discharged or low refrigerant charge
    • Wiring, terminals or connectors
    • A/C pressure transducer
    • PCM

  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

  3. A1 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) PRESSURE SENSOR (ACP_PRESS) PID (PARAMETER IDENTIFICATION) WITH THE MANIFOLD GAUGE SET READINGS

    NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1 deg.C (70 deg.F). As ambient temperatures near 38 deg.C (100.4 deg.F), the pressure value difference increases above +/- 15 psi (103 kPa) range.

    • Allow the A/C system to stabilize to the outside ambient temperature.

    • Ignition ON.

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

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

      Access the PCM and monitor the ACP_PRESS (kPa) PID

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

    Yes  IGNORE the Diagnostic Trouble Codes (DTCs). REFER to the Symptom Chart in this information. If refrigerant pressures are low, INSPECT the A/C system for a leak. REFER to the appropriate GENERAL PROCEDURES  for leak detection.
    No  GO to  A2

  4. A2 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

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

    • Disconnect A/C pressure transducer C1260.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1260-1
      GFD560313Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1260-2
      GFD560313Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1260-3
      GFD560313Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  A3

  5. A3 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1260-1
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1260-2
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1260-3
      GFD560314Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  A4
    No  REPAIR the circuit.

  6. A4 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR AN OPEN

    Are the resistances less than 3 ohms? 

    Yes  INSTALL a new A/C pressure transducer. REFER to: Air Conditioning (A/C) Pressure Transducer . CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the PCM self-test. TEST the system for normal operation. If the concern is still present, GO to  A5
    No  REPAIR the circuit.

  7. A5 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.
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