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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Auto A/C) - Diagnostic Codes (2 Of 2) >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> DTC P0530-15: Refrigerant Pressure Sensor Circuit Short to Battery or Open [11/2023 - ] >> Procedure

DTC P0530-15: Refrigerant Pressure Sensor Circuit Short to Battery or Open [11/2023 - ]: Procedure

  1. CHECK COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET 

    Pre-procedure1

    1. Install a manifold gauge set.

      HINT: 

      Refer to ON-VEHICLE INSPECTION [12/2019 - ]

      Procedure1

    2. Compare the values displayed in the Data List and on the manifold gauge.

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Air conditioning pressure sensor -32768 to 32767 kPa (gauge) (-32.768 to 32.767 MPaG) Actual refrigerant pressure displayed
      • Refrigerant line (gas leak etc.)
      • Air conditioning pressure sensor circuit malfunction

      Body Electrical > Air Conditioner > Data List 

      Tester Display
      Regulator Pressure Sensor

      Result

      Result Proceed to
      Data List value and manifold gauge set value do not match A
      Data List value matches manifold gauge set value B

      Post-procedure1

    3. None

    Result: 

    B 

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET. Refer to  ON-VEHICLE INSPECTION [12/2019 - ] 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY926186Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioning Pressure Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-1 (-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.

      Procedure1

    2. Measure the voltage according to the value(s) in the table below.
      GTY926228Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioning Pressure Sensor)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A24-2 (PR) - Body ground Ignition switch ON 3.0 to 5.25 V

      Result

      Result Proceed to
      A24-2 (PR) - Body ground is more than 5.25 V A
      A24-2 (PR) - Body ground is more than or equal to 3.0 and less than or equal to 5.25 V B
      A24-2 (PR) - Body ground is less than 3.0 V C

      Post-procedure1

    3. None

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  7

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.
    2. Disconnect the H63 air conditioning amplifier assembly connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-2 (PR) or H63-6 (PRE) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (INTERNAL CIRCUIT RESISTANCE) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY926185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioning Pressure Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-3 (+) - A24-2 (PR) Ignition switch off 180 to 220 kΩ

      HINT: 

      After turning the ignition switch off, wait at least 30 seconds before performing the measurement.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING PRESSURE SENSOR. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.
    2. Disconnect the H63 air conditioning amplifier assembly connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-2 (PR) - A24-3 (+) Always 10 kΩ or higher
      H63-6 (PRE) - H63-11 (S5-3) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.
    2. Disconnect the H63 air conditioning amplifier assembly connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-2 (PR) - H63-6 (PRE) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING PRESSURE SENSOR) 

    Pre-procedure1

    1. Disconnect the A24 air conditioning pressure sensor connector.
    2. Disconnect the H63 air conditioning amplifier assembly connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A24-1 (-) - H63-15 (SG-4) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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