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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When replacing the VSC actuator assembly, perform zero point calibration (See CALIBRATION  ).
  1. CHECK TERMINAL VOLTAGE (BOOSTER PEDAL MICRO SWITCH) 
    1. Disconnect A18 booster connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      A18-5 (STS) - Body ground Always Approximately 12 V
      Fig 1: Identifying A18 Active Brake Booster Connector Terminals
      G05159782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  3

    OK: Go To Next Step 

  2. CHECK BOOSTER PEDAL MICRO SWITCH 
    1. When using an oscilloscope:
      1. Connect the oscilloscope between terminals 1 (PSNO) and 5 (STS), 2 (PSNC) and 5 (STS) of the brake booster with connector being connected.
      2. Turn the ignition switch to ON.
      3. Check the signal waveform while the brake pedal is depressed and released.

        OK: Signal waveform changes as shown below. 

        Fig 2: Checking Booster Pedal Micro Switch
        G05686659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. When not using an oscilloscope:
      1. Disconnect the A18 booster connector.
      2. Turn the ignition switch to ON.
      3. Measure the voltage according to the value (s) in the table below.

        Standard Voltage 

        TESTER CONNECTION SPECIFIED CONDITION TABLE

        Tester Connection Condition Specified Condition
        A18-2 (PSNC) - A18-5 (STS) Brake pedal is depressed 6V
        A18-1 (PSNO) - A18-5 (STS) Brake pedal is released
        Fig 3: Identifying A18 Active Brake Booster Connector Terminals
        G05159784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE BRAKE BOOSTER ASSEMBLY 

    OK: Go To Next Step 

  3. CHECK HARNESS AND CONNECTOR (BOOSTER PEDAL MICRO SWITCH - SKID CONTROL ECU) 
    1. Confirm that the skid control ECU connector and brake booster connector are properly connected.
    2. Disconnect the A17 ECU connector.
    3. Disconnect the A18 booster connector.
    4. Inspect both the connector case and the terminal for deformation and corrosion.

      OK: No deformation or corrosion. 

    5. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      A17-24 (PSNC) - A18-2 (PSNC) Always Below 1 Ω
      A17-24 (PSNC) - Body ground Always 10 kΩ or higher
      A17-25 (PSNO) - A18-1 (PSNO) Always Below 1 Ω
      A17-25 (PSNC) - Body ground Always 10 kΩ or higher
      A17-27 (STS) - A18-5 (STS) Always Below 1 Ω
      A17-27 (STS) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying A17 Skid Control ECU Connector And A18 Active Brake Booster Connector
      G05686661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE VSC ACTUATOR ASSEMBLY  (See REMOVAL  )

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