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Power Steering ECU Communication Stop Mode [11/2023 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (RACK AND PINION POWER STEERING GEAR ASSEMBLY MAIN LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the C67 rack and pinion power steering gear assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C67-10 (CANH) - C67-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      GTY1178483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (RACK AND PINION POWER STEERING GEAR ASSEMBLY) 

    Result: 

    OK 

    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
      C67-7 (PGND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      GTY1178482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)
    2. Reconnect the cable to the negative (-) battery terminal.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C67-8 (PIG) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      w/ Stop and Start System A
      w/o Stop and Start System B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C67-4 (IG) - Body ground Ignition switch ON 10.5 to 16 V
      GTY1178481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT) 

    Refer to Backup Boost Converter Circuit [11/2023 - ]

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C67-4 (IG) - Body ground Ignition switch ON 8 to 16 V
      GTY1178481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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