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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 219 (Heating / Air Conditioning System (Except Hybrid) - Diagnostic Codes & Symptom Tests) >> AIR CONDITIONING SYSTEM (for Gasoline Model) >> DTC B1423: Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure [06/2018 - ] >> Procedure

DTC B1423: Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
    5. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B14B8 is not output A
      B14B8 is output B

    Result: 

    B 

    GO TO DTC B14B8. Refer to  DTC B14B8: Refrigerant Shortage [06/2018 - ]  

    Result: 

    A 

    See step  2

  2. COMPARE REFRIGERANT GAS PRESSURE VALUES SHOWN ON TECHSTREAM AND MANIFOLD GAUGE SET 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Air conditioner pressure sensor Min.: -456.68 kPaG
      Max.: 3294.37 kPaG      		 Actual refrigerant pressure displayed
      • Refrigerant line (gas leak etc.)
      • Air conditioner pressure sensor circuit malfunction

      Body Electrical > Air Conditioner > Data List 

      Tester Display
      Regulator Pressure Sensor
    6. Install a manifold gauge set.

      Refer to ON-VEHICLE INSPECTION [06/2018 - ]

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

      Result

      Result Proceed to
      Data List value and manifold gauge set value do not match and Data List value: 176 kPaG (1.8 kgf/cm2 , 26 psi) or less A
      Data List value and manifold gauge set value do not match and Data List value: 3025 kPaG (30.8 kgf/cm2 , 439 psi) or more B
      Data List value matches manifold gauge set value C

    Result: 

    B 

    See step  8

    Result: 

    C 

    GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE). Refer to  ON-VEHICLE INSPECTION [06/2018 - ] 

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Air conditioner pressure sensor Min.: -456.68 kPaG
      Max.: 3294.37 kPaG      		 Actual refrigerant pressure displayed
      • Refrigerant line (gas leak etc.)
      • Air conditioner pressure sensor circuit malfunction

      Body Electrical > Air Conditioner > Data List 

      Tester Display
      Regulator Pressure Sensor

      OK

      Disconnecting the A22 connector of the air conditioner 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  6

    Result: 

    A 

    See step  4

  4. CHECK TERMINAL VOLTAGE (AIR CONDITIONER PRESSURE SENSOR) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY961016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioner Pressure Sensor)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A22-3 (+) - Body ground Engine switch on (IG) 4.75 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONER PRESSURE SENSOR. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-3 (+) - G40-6 (S5-3) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK TERMINAL VOLTAGE (AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY961471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioner Pressure Sensor)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A22-2 (PR) - Body ground Engine switch on (IG) 3.0 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-2 (PR) or G40-24 (PRE) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the A22 air conditioner pressure sensor connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-1 (-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  9

  9. CHECK TERMINAL VOLTAGE 
    1. Measure the voltage according to the value(s) in the table below.
      GTY961471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioner Pressure Sensor)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A22-2 (PR) - Body ground Engine switch on (IG) 3.0 to 5.25 V

      Result

      Result Proceed to
      5.25 V or higher A
      3.0 to 5.25 V B
      Below 3.0 V C

    Result: 

    B 

    See step  11

    Result: 

    C 

    See step  13

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-2 (PR) or G40-24 (PRE) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK INTERNAL CIRCUIT RESISTANCE (AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-3 (+) - A22-2 (PR) Engine switch off 180 to 220 kΩ

      HINT: 

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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONER PRESSURE SENSOR. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    NG 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-2 (PR) or G40-24 (PRE) - A22-3 (+) or G40-6 (S5-3) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-2 (PR) - G40-24 (PRE) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G40 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-1 (-) - G40-3 (SG-4) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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