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Inspection Procedure

NOTE: When replacing the skid control ECU or brake actuator, perform initialization of linear solenoid valve and calibration (see INITIALIZATION  ).
  1. CHECK BRAKE FLUID LEAKAGE 
    1. Check that there is no fluid leakage in the brake line between the brake actuator and the wheel cylinder which is the cause of DTCs.
      Fig 1: Identifying Fluid Leakage In Brake Line Between Brake Actuator And Wheel Cylinder
      G04949613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the brake is not dragging.

      OK: There is no fluid leakage or dragging. 

    NG: REPAIR OR REPLACE APPLICABLE PART 

    OK: GO TO NEXT STEP 

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER OR TECHSTREAM (BRAKE ACTUATOR) 
    1. Connect the intelligent tester or Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the intelligent tester or Techstream main switch on.
    4. Select the ACTIVE TEST mode on the intelligent tester or Techstream.

      HINT:

      The ACTIVE TEST can be performed when the following conditions are met.

      • Main relay 1 and 2 are on.
      • Shift lever is P position.
      • Parking brake is on.
      • Vehicle speed is 0 km/h (0 mph).
      1. Intelligent tester

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Test Part Control Range Diagnostic Note
        SMC1 Turns electronically controlled brake system solenoid (SMC1) ON / OFF Operation sound of solenoid (clicking sound) can be heard
        SMC2 Turns electronically controlled brake system solenoid (SMC2) ON / OFF Operation sound of solenoid (clicking sound) can be heard
      2. Techstream

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Test Part Control Range Diagnostic Note
        Electronically Controlled Brake System Solenoid (SMC1) Turns electronically controlled brake system solenoid (SMC1) ON / OFF Operation sound of solenoid (clicking sound) can be heard
        Electronically Controlled Brake System Solenoid (SMC2) Turns electronically controlled brake system solenoid (SMC2) ON / OFF Operation sound of solenoid (clicking sound) can be heard
    5. Check each wheel cylinder pressure sensor.

      OK: Each wheel cylinder pressure increases. 

    NG: REPLACE BRAKE ACTUATOR (See  REMOVAL   ) 

    OK: REPLACE BRAKE ACCUMULATOR PUMP (See  REMOVAL   ) 

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