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Skid Control ECU Communication Stop Mode [11/2018 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS WIRE (BRAKE ACTUATOR ASSEMBLY [SKID CONTROL ECU] BRANCH WIRE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the brake actuator assembly (skid control ECU) connector.
      GTY910875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly [Skid Control ECU])
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A39-5 (CANH) - A39-19 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Result

      Result  Proceed to 
      OK (w/ Stop and Start System) A
      OK (w/o Stop and Start System) B
      NG C

    Result: 

    B 

    See step  3

    Result: 

    C 

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A39-46 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      A39-14 (GND2) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      GTY910874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly [Skid Control ECU])
    2. Reconnect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021] , or refer to INITIALIZATION [12/2021 - 10/2022] , or refer to INITIALIZATION [10/2022 - 10/2023] , or refer to INITIALIZATION [10/2023 - ]

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A39-36 (IG1) - Body ground Ignition switch ON 10.5 to 16 V
      Ignition switch off Below 1 V
      A39-1 (+BM) - Body ground Always 11 to 14 V
      A39-30 (+BS) - Body ground Always 11 to 14 V

      Result

      Result  Proceed to 
      OK A
      NG (IG1 terminal) B
      NG (Other terminal) C

    Result: 

    A 

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) 

    Refer to REMOVAL [11/2018 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    B 

    GO TO STOP AND START SYSTEM 

    Refer to Backup Boost Converter Circuit [11/2018 - 10/2019] , or refer to Backup Boost Converter Circuit [10/2019 - 08/2020] , or refer to Backup Boost Converter Circuit [08/2020 - 12/2021] , or refer to Backup Boost Converter Circuit [12/2021 - 10/2022] , or refer to Backup Boost Converter Circuit [10/2022 - 10/2023] , or refer to Backup Boost Converter Circuit [10/2023 - ]

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A39-46 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      A39-14 (GND2) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      GTY910874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Brake Actuator Assembly [Skid Control ECU])
    2. Reconnect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021] , or refer to INITIALIZATION [12/2021 - 10/2022] , or refer to INITIALIZATION [10/2022 - 10/2023] , or refer to INITIALIZATION [10/2023 - ]

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A39-36 (IG1) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A39-1 (+BM) - Body ground Always 11 to 14 V
      A39-30 (+BS) - Body ground Always 11 to 14 V

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) 

    Refer to REMOVAL [11/2018 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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