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Skid Control ECU Communication Stop Mode [10/2015 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU BRANCH LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      GTY549083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    2. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A51-37 (CA1H) - A51-38 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)) 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) auxiliary battery terminal.
      NOTE:

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

      Refer to INITIALIZATION [10/2015 - ]

      GTY549084Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A51-15 (BS) - Body ground Power switch off 11 to 14 V
      A51-14 (B1) - Body ground Power switch off 11 to 14 V
      A51-16 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      A51-12 (IG2) - Body ground Power switch on (IG) 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A51-28 (GND) - Body ground Always Below 1 Ω
      A51-27 (GND2) - Body ground Always Below 1 Ω
      A51-26 (GND3) - Body ground Always Below 1 Ω
      A51-25 (GND4) - Body ground Always Below 1 Ω
      A51-24 (GND5) - Body ground Always Below 1 Ω
      A51-23 (GND6) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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