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Brake Actuator (Skid Control ECU) Communication Stop Mode [11/2016 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the A85 skid control ECU (brake actuator assembly) connector.
      GTY722195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A85-22 (CANH) - A85-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR 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.
      GTY738770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      A85-25 (GND1) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      A85-1 (GND2) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    2. Reconnect the cable to the negative (-) battery terminal.
    3. Measure the voltage according to the value(s) in the table below.
      GTY722194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A85-13 (BM) - Body ground Always 11 to 14 V
      A85-38 (+BS) - Body ground Always 11 to 14 V
      A85-12 (IG1) - Body ground Ignition switch ON 11 to 14 V

      Result

      Result Proceed to
      OK A
      • NG (except IG1 signal circuit)
      • NG (for IG1 signal circuit (w/o Stop and Start System))
      		 B
      NG (for IG1 signal circuit (w/ Stop and Start System)) C

    Result: 

    A 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [11/2016 - ] 

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    Result: 

    C 

    Refer to  Backup Boost Converter Circuit [11/2016 - ] 

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