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DTC P1501-7A: Hybrid/EV Battery Cooling Refrigerant Gas Fluid Leak or Seal Failure [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 DTC (AIR CONDITIONING SYSTEM) 
    1. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      HINT: 

      Check even when the DTCs detected for temporary failures.

      Result

      Result Proceed to
      Only P1501-7A is output A
      P1501-7A and P0070-11 are output B
      P1501-7A and P0070-15 are output C
      P1501-7A and P0530-11 are output D
      P1501-7A and P0530-15 are output E
      P1501-7A and P0530-1C are output F
      P1501-7A and P15B9-62 are output G
      Relevant DTC
      P0070-11 Ambient Temperature Sensor Circuit Short to Ground
      P0070-15 Ambient Temperature Sensor Circuit Short to Battery or Open
      P0530-11 Refrigerant Pressure Sensor Circuit Short to Ground
      P0530-15 Refrigerant Pressure Sensor Circuit Short to Battery or Open
      P0530-1C Refrigerant Pressure Sensor Circuit Voltage Out of Range
      P15B9-62 Ambient Temperature Sensor / Ambient Temperature Sensor "B" Signal Compare Failure

    Result: 

    B 

    GO TO DTC CHART (P0070-11). Refer to  DTC P0070-11: Ambient Temperature Sensor Circuit Short to Ground [12/2023 - ] 

    Result: 

    C 

    GO TO DTC CHART (P0070-15). Refer to  DTC P0070-15: Ambient Temperature Sensor Circuit Short to Battery or Open [12/2023 - ] 

    Result: 

    D 

    GO TO DTC CHART (P0530-11). Refer to  DTC P0530-11: Refrigerant Pressure Sensor Circuit Short to Ground [12/2023 - ] 

    Result: 

    E 

    GO TO DTC CHART (P0530-15). Refer to  DTC P0530-15: Refrigerant Pressure Sensor Circuit Short to Battery or Open [12/2023 - ] 

    Result: 

    F 

    GO TO DTC CHART (P0530-1C). Refer to  DTC P0530-1C: Refrigerant Pressure Sensor Circuit Voltage Out of Range [12/2023 - ] 

    Result: 

    G 

    GO TO DTC CHART (P15B9-62). Refer to  DTC P15B9-62: Ambient Temperature Sensor / Ambient Temperature Sensor "B" Signal Compare Failure [12/2023 - ]  

    Result: 

    A 

    See step  2

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

    HINT: 

    This check is meant to compare the refrigerant gas pressure with GTS data when the engine is stopped and observed and the air conditioning tool, so do not operate the compressor.

    Pre-procedure1

    • Blower switch turn off.
    • Wait for 60 minutes after turning the ignition switch off.
    • Install a manifold gauge set.
    • 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
    • Compare the values displayed in the Data List and on the manifold gauge set.

      Result

      Result Proceed to
      Data List values and air conditioning tool set values match A
      Data List values and air conditioning tool set values does not match B

    Post-procedure1

    • None

    Result: 

    A 

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

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    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: 

    NG 

    See step  9

    Result: 

    OK 

    See step  4

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

    Pre-procedure1

    • Disconnect the B16 air conditioning pressure sensor connector.
    • Measure the resistance according to the value(s) in the table below.
      GTY1238971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Air Conditioning Pressure Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B16-1 (-) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  5

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

    Pre-procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D35-6 (PRE) - B16-2 (PR) Always Below 1 Ω Ω
      D35-6 (PRE) or B16-2 (PR) - Other terminals and body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT AIR CONDITIONING PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT) 
    NOTE:
    • If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.61 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.
    • It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

    Pre-procedure1

    • Connect the D35 air conditioning amplifier assembly connector.
    • Measure the voltage with the following conditions met.

      Measurement Condition

      Item Condition
      Vehicle doors Fully open
      Temperature setting MAX COLD
      Blower speed HI
      A/C switch On
      Recirculation/fresh switch Recirculation
      Interior temperature 25 to 35°C (77 to 95°F)
    • Measure the voltage according to the value(s) in the table below.
      GTY1240906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Air Conditioning Amplifier Assembly)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      D35-6 (PRE) - Body ground A/C switch on
      (Compressor operating)      		 0.62 to 4.73 V V

      HINT: 

      When the ambient air temperature is low (below -1.5°C (29.3°F)), the compressor will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

      OK

      The voltage value changes.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

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

    Result: 

    OK 

    See step  7

  7. INSPECT AIR CONDITIONING PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT) 
    NOTE:
    • If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.61 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.
    • It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

    Pre-procedure1

    • Measure the voltage with the following conditions met.

      Measurement Condition

      Item Condition
      Vehicle doors Fully open
      Temperature setting MAX COLD
      Blower speed HI
      A/C switch On
      Recirculation/fresh switch Recirculation
      Interior temperature 25 to 35°C (77 to 95°F)
    • 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

      HINT: 

      When the ambient air temperature is low (below -1.5°C (29.3°F)), the compressor will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

      OK

      The value displayed in the Data List changes.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    NG 

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

  8. 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
      B16-1 (-) - D35-15 (SG-4) Always Below 1 Ω Ω
      B16-1 (-) or D35-15 (SG-4) - 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 

  9. 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
      B16-3 (+) - D35-11 (S5-3) Always Below 1 Ω Ω
      B16-3 (+) or D35-11 (S5-3) - 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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