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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Heating / Air Conditioning System - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for PHEV Model) >> DTC P0530-11: Refrigerant Pressure Sensor Circuit Short to Ground [12/2023 - ] >> Procedure

DTC P0530-11: Refrigerant Pressure Sensor Circuit Short to Ground [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON GTS AND MANIFOLD GAUGE SET 

    Pre-procedure1

    • 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

    • None

    Result: 

    B 

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET. Refer to  ON-VEHICLE INSPECTION [09/2023 - ] 

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (REGULATOR PRESSURE SENSOR) 
    1. Read the Data List according to the display on the GTS.

      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

      OK

      Disconnecting the B16 connector of the air conditioning pressure sensor causes the Data List value to change.

      Result

      Result Proceed to
      Regulator pressure sensor value changes A
      Regulator pressure sensor value does not change B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING PRESSURE SENSOR - POWER SOURCE) 

    Pre-procedure1

    • Disconnect the B16 air conditioning pressure sensor connector.
    • Measure the voltage according to the value(s) in the table below.
      GTY1238965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioning Pressure Sensor)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B16-3 (+) - Body ground Ignition switch ON 4.75 to 5.25 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE AIR CONDITIONING PRESSURE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  4

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

    Pre-procedure1

    • Disconnect the B16 air conditioning pressure sensor connector.
    • Disconnect the D35 air conditioning amplifier assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B16-3 (+) - D35-11 (S5-3) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

    Pre-procedure1

    • Disconnect the B16 air conditioning pressure sensor connector.
    • Measure the voltage according to the value(s) in the table below.
      GTY1238964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioning Pressure Sensor)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B16-2 (PR) - Body ground Ignition switch ON 3.0 to 5.25 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  6

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

    Pre-procedure1

    • Disconnect the B16 air conditioning pressure sensor connector.
    • Disconnect the D35 air conditioning amplifier assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B16-2 (PR) or D35-6 (PRE) - Other terminals and body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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