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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Hybrid Control System (Diagnostic Codes) (2 Of 5)) >> Hybrid Control System >> DTC P0A9B-2A: Hybrid/EV Battery Temperature Sensor "A" Signal Stuck In Range; DTC P0AC52A: Hybrid/EV Battery Temperature Sensor "B" Signal Stuck In Range; DTC P0ACA2A: Hybrid/EV Battery Temperature Sensor "C" Signal Stuck In Range; DTC P306562: Hybrid/EV Battery Temperature Sensor "Group 1" Signal Compare Failure [10/2018 - ] >> Procedure

DTC P0A9B-2A: Hybrid/EV Battery Temperature Sensor "A" Signal Stuck In Range; DTC P0AC52A: Hybrid/EV Battery Temperature Sensor "B" Signal Stuck In Range; DTC P0ACA2A: Hybrid/EV Battery Temperature Sensor "C" Signal Stuck In Range; DTC P306562: Hybrid/EV Battery Temperature Sensor "Group 1" Signal Compare Failure [10/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      "P0AFC00 or P0AFC96" is not output. A
      "P0AFC00 or P0AFC96" is also output. B
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

    Result: 

    A 

    See step  2

  2. CHECK INSTALLATION OF TEMPERATURE SENSOR (HYBRID BATTERY TEMPERATURE) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the upper No. 1 hybrid battery cover sub-assembly.

      Refer to PROCEDURE - Step 22 [10/2018 - 07/2022] Refer to PROCEDURE - Step 22 [07/2022 - ]

    3. Visually check the installation condition of the relevant battery temperature sensor.
      GTY815597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Battery Temperature Sensor 0 *2 Battery Temperature Sensor 1
      *3 Battery Temperature Sensor 2 - -

      Standard Condition

      Each battery temperature sensor is installed in the correct location with the correct orientation and its claws are engaged securely.

      Result

      Result Proceed to
      Each battery temperature sensor is installed in the correct location with the correct orientation and its claws are engaged securely. A
      Claws are damaged. B
      Any of battery temperature sensors are not installed correctly, but claws are not damaged. C
    4. Install the upper No. 1 hybrid battery cover sub-assembly.

    Result: 

    B 

    REPLACE HYBRID BATTERY THERMISTOR. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    Result: 

    C 

    INSTALL PARTS CORRECTLY 

    Result: 

    A 

    See step  3

  3. CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 hybrid battery exhaust duct.

      Refer to PROCEDURE - Step 20 [10/2018 - 07/2022] Refer to PROCEDURE - Step 20 [07/2022 - ]

    3. Disconnect the z12 battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    4. Measure the resistance of the circuit for the malfunctioning sensor (battery temperature sensor 0 to 2).
      GTY835471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Battery Voltage Sensor)

      Tester Connection

      Tester Connection Battery Temperature Sensor
      z12-4 (TB0) - z12-10 (GB0) 0
      z12-3 (TB1) - z12-9 (GB1) 1
      z12-2 (TB2) - z12-8 (GB2) 2

      Standard Resistance

      Thermistor Temperature Switch Condition Specified Condition
      0°C (32°F) Power switch off 26.7 to 27.8 kΩ
      25°C (77°F) Power switch off 9.9 to 10.1 kΩ
      40°C (104°F) Power switch off 5.73 to 5.92 kΩ
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    5. Disconnect the N40 battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    6. Measure the resistance according to the value(s) in the table below.
      GTY781030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      z12-4 (TB0) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-4 (TB0) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-10 (GB0) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-10 (GB0) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-3 (TB1) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-3 (TB1) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-9 (GB1) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-9 (GB1) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-2 (TB2) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-2 (TB2) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-8 (GB2) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-8 (GB2) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-1 (TC0) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-1 (TC0) - N40-5 (GND) Power switch off 10 kΩ or higher
      z12-7 (GC0) - N40-1 (IGCT) Power switch off 10 kΩ or higher
      z12-7 (GC0) - N40-5 (GND) Power switch off 10 kΩ or higher
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

    7. Reconnect the N40 and z12 battery voltage sensor connectors.
    8. Install the No. 1 hybrid battery exhaust duct.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the upper No. 1 hybrid battery cover sub-assembly.

      Refer to PROCEDURE - Step 22 [10/2018 - 07/2022] Refer to PROCEDURE - Step 22 [07/2022 - ]

    3. Check the wire harness and connectors of the battery temperature sensor for abnormalities by sight and touch.

      Specified Condition

      There are no open or short circuits in the wire harness and connectors. There are no short circuits to other wire harnesses.

      Result

      Proceed to
      OK
      NG
    4. Install the upper hybrid battery cover sub-assembly.

    Result: 

    OK 

    REPLACE HYBRID BATTERY THERMISTOR. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    Result: 

    NG 

    REPAIR HARNESS OR CONNECTOR (BATTERY TEMPERATURE SENSOR) 

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