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Power Steering ECU Communication Stop Mode [11/2018 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS WIRE (RACK AND PINION POWER STEERING GEAR ASSEMBLY BRANCH WIRE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the rack and pinion power steering gear assembly connector.
      GTY854738Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)      		 - -
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C54-10 (CANH) - C54-11 (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.
      GTY854631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      C54-7 (PGND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    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 Switch Condition Specified Condition
      C54-4 (IG) - Body ground Ignition switch ON 10.5 to 16 V
      Ignition switch off Below 1 V

      Result

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

    Result: 

    A 

    REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY 

    Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 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.
      GTY854631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      C54-7 (PGND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    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 Switch Condition Specified Condition
      C54-4 (IG) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY 

    Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 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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