BRAKE CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Combination Meter Assembly Brake System Warning Light

    • Illuminates to alert the driver when the skid control ECU detects a malfunction in the EBD or brake system.

    • Illuminates to alert the driver when the brake fluid level is low.

    • Illuminates to inform the driver of the parking brake condition.
    ABS Warning Light Illuminates to alert the driver when the skid control ECU detects a malfunction in the ABS.
    Slip Indicator Light

    • Blinks to inform the driver when the TRC and VSC.

    • Illuminates to alert the driver when the skid control ECU detects a malfunction in the TRC or VSC.
    VSC OFF Indicator Light

    • Illuminates when the VSC OFF switch (pattern select switch assembly) is pressed for about three seconds to select VSC OFF Mode.*1

    • Illuminates when VSC SPORT Mode is selected.
    VSC SPORT Indicator Light Illuminates when VSC SPORT Mode is selected.
    TRC OFF Indicator Light

    • Illuminates when the VSC OFF switch (pattern select switch assembly) is pressed briefly to select TRC OFF Mode.*2

    • Illuminates when the VSC OFF switch (pattern select switch assembly) is pressed for about three seconds to select TRC OFF Mode.*1
    VSC OFF Switch (Pattern Select Switch Assembly) Enables the driver to select "Normal Mode", "TRC OFF Mode", "VSC OFF Mode" or "VSC/TRC OFF Mode".
    VSC SPORT Switch (Pattern Select Switch Assembly) Enables the driver to select Normal Mode or VSC SPORT Mode.
    Stop Light Switch Assembly Detects the brake pedal depressing signal.
    Steering Sensor Detects the direction and angle of the steering wheel.
    Front and Rear Speed Sensors Detects the wheel speed of each of the 4 wheels.
    Brake Actuator Assembly Changes the fluid path based on the signals from the skid control ECU during the operation of the brake control system functions, in order to control the fluid pressure applied to the wheel cylinders.

    Master Cylinder Pressure Sensor

    (Built into Brake Actuator Assembly)

    		 Detects the master cylinder pressure.
    Skid Control ECU Judges the vehicle driving condition based on the signals from each sensor, and sends the brake control signals to the brake actuator.

    Yawrate Sensor

    (with Built-in Skid Control ECU)

    		 Detects vehicle turning angle velocity and front and rear, left and right acceleration.
    ECM Based on the signals received from the skid control ECU, controls the engine output.

    Tech Tips

    *1: If the VSC OFF switch (pattern select switch assembly) is pressed for about three seconds, VSC and TRC turn off, and the VSC OFF indicator light and TRC OFF indicator light illuminate simultaneously.

    *2: If the vehicle speed exceeds about 50 km/h (31.1 mph) while in TRC OFF mode, TRC automatically turns on, and the TRC OFF indicator light turns off.

  2. SYSTEM CONTROL

    Control Outline
    Anti-lock Brake System (ABS) The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking on a slippery surface.
    Electronic Brake Force Distribution (EBD) The EBD control utilizes ABS, achieving proper brake force distribution between the front and rear wheels in accordance with the driving conditions.
    Brake Assist

    • The primary purpose of brake assist is to provide an auxiliary brake force to assist a driver who cannot generate a large brake force during emergency braking, thus helping ensure the vehicle's braking performance.

    • If the skid control ECU judges that the brake pedal force applied by the driver is not sufficient to ensure adequate braking force, brake assist is used to enhance the braking force.
    Traction Control (TRC) The TRC helps restrain the slippage of the drive wheels if the driver depresses the accelerator pedal excessively when starting off or while accelerating on a slippery surface.
    Limited Slip Differential (LSD) Function The LSD function detects a difference in rotation speeds between the left and right drive wheels. If there is a difference in rotation speeds between them, this function applies brake to the drive wheel that rotates faster than the other using pressurization function of the VSC to minimize the difference.
    Vehicle Stability Control (VSC) The VSC helps restrain sideways slippage of the vehicle during a strong front wheel skid or strong rear wheel skid, which may occur while cornering.

    1. Anti-lock Brake System (ABS)


      1. The ABS prevents the wheels from locking during sudden braking or braking on a slippery surface. This provides the proper braking force when the vehicle slips, thus ensuring vehicle stability and excellent braking performance.

        B0082M4E04
        Text in Illustration (Illustration Provides Conceptual Image:)
        *A Models with ABS *B Models without ABS
        *a Brake Operation - -

    2. Electronic Brake Force Distribution (EBD)


      1. This function controls the brake force that acts on the rear wheels in accordance with the changes in the vehicle conditions such as load factors or deceleration, in order to ensure excellent braking performance.

        B0082MLE01

      2. During cornering braking, this function controls the brake force that acts on the left and right wheels in accordance with the vehicle conditions. This ensures vehicle stability and excellent braking performance.

        B0082LS
        Text in Illustration
        B0082JM Control Moment B0082MO Brake Force

    3. Brake Assist


      1. During the brake assist, the skid control ECU calculates the speed and the amount of the brake pedal application based on the signals from the master cylinder pressure sensor and then determines the intention of the driver to make an emergency brake application. If the skid control ECU determines that the driver intends to make an emergency brake application, this function activates the brake actuator to increase the brake fluid pressure, which increases the brake force.

        B0082K0E02

    4. Traction Control (TRC)


      1. The TRC helps prevent the drive wheels from slipping if the driver depresses the accelerator pedal excessively when starting off or accelerating on a slippery surface. Simultaneously with the hydraulic brake control of the drive wheels, the skid control ECU makes a request to the ECM to effect engine output control. This produces the drive force that suits the driving conditions, in order to ensure the proper start-off acceleration.

        B0082IRE02
        Text in Illustration (Driving on Road with Differing Surface Friction Characteristics:)
        *A Models without TRC *B Models with TRC
        *1

        ECM

        - Engine Output Control

        		 *2

        Brake Actuator Assembly

        - Hydraulic Brake Control
        *a Brake Slipping Drive Wheel - -
        B0082J7 Slippery Surface - -

    5. Limited Slip Differential (LSD) Function


      1. The LSD function detects a difference in rotation speeds between the left and right drive wheels. If there is a difference in rotation speeds between them, this function applies brake to the drive wheel that rotates faster than the other using pressurization function of the VSC* to minimize the difference.

      2. This function makes it possible to start and accelerate the vehicle stably.

        Tech Tips

        *:This function always activates regardless of ON/OFF of the VSC mode.

    6. Vehicle Stability Control (VSC)


      1. The following are 2 examples that can be considered circumstances in which the tires exceed their lateral grip limit. The VSC is designed to help control the vehicle behavior by controlling the engine output and the brakes of each wheel when the vehicle is under one of the conditions indicated below:

        B0082JFE01
        Text in Illustration
        *a

        Front Wheel Skid Tendency (Understeer)

        - When the front wheels lose grip in relation to the rear wheel

        		 *b

        Rear Wheel Skid Tendency (Oversteer)

        - When the rear wheels lose grip in relation to the front wheels

      2. The vehicle's sideways skid tendency is determined by the skid control computer based on the target yaw rate and actual vehicle yaw rate values.

      3. Whether or not the vehicle is experiencing a front wheel skid is determined by the difference between the target yaw rate and the vehicle's actual yaw rate. When the vehicle's actual yaw rate is smaller than the target yaw rate (which is determined based on the vehicle speed and steering angle) that should be generated when the driver operates the steering wheel, it means the vehicle is making a turn at a greater angle than the target locus of travel. Thus, the skid control ECU determines that there is a large front wheel skid tendency.

        B0082KPE01
        Text in Illustration
        *a Actual Locus of Travel (Actual Yaw Rate) *b Locus of Travel Based on Target Yaw Rate

      4. Whether or not the vehicle is experiencing a rear wheel skid is determined by the values of the vehicle's slip angle and the vehicle's slip angular velocity (time-dependent changes in the vehicle's slip angle). When the vehicle's slip angle is large, and the slip angular velocity is also large, the skid control ECU determines that the vehicle has a large rear wheel skid tendency.

        B0082MME01
        Text in Illustration
        *a Travel Direction of Vehicle's Center of Gravity *b Movement of Vehicle
        B0082JM Slip Angle - -

      5. When the skid control ECU determines that the vehicle is exhibiting a tendency to experience a front wheel skid or a rear wheel skid, it decreases the engine output and applies the brakes of each wheel to control the vehicle's yaw moment. The basic operation of the VSC is described below. However, the control method differs depending on the vehicle's characteristics and driving conditions.

      6. When the skid control ECU determines that there is a front wheel skid tendency, it applies the brake on the rear wheel on the inside of the turn in accordance with the extent of the skid tendency in order to help restrain the front wheel from skidding.

        B0082IJ
        Text in Illustration
        B0082JM Control Moment B0082MO Brake Force

      7. When the skid control ECU determines that there is a large rear wheel skid tendency, it takes countermeasures in accordance with the extent of that tendency. It applies the brakes of the front wheel of the outer circle of the turn, and generates an outward moment of inertia in the vehicle, in order to restrain the rear wheel skid tendency. Along with the reduction in the vehicle speed caused by the braking force, excellent vehicle stability is ensured. In some cases, the skid control ECU applies the brake of the rear wheels, as necessary.

        B0082KQ
        Text in Illustration
        B0082JM Control Moment B0082MO Brake Force

  3. FUNCTION


    1. VSC OFF Switch (Pattern Select Switch Assembly)


      1. The operation of the VSC and TRC functions can be stopped by the VSC OFF switch (pattern select switch assembly). While the vehicle is running off the shoulder of the road or running on a dirt road, the engine output control is stopped to maintain drive torque.

        B0082LKE02
        Text in Illustration
        *1 VSC OFF Indicator Light *2 TRC OFF Indicator Light
        *3 VSC OFF Switch (Pattern Select Switch Assembly) - -

      2. The VSC OFF switch (pattern select switch assembly) can select 3 modes (Normal mode, TRC OFF mode, and VSC OFF mode).

      3. Briefly pressing the VSC OFF switch (pattern select switch assembly) in Normal mode selects TRC OFF mode.

      4. Pressing and holding the VSC OFF switch (pattern select switch assembly) for 3 seconds or more will disable the VSC and TRC functions.

      5. Briefly pressing the VSC OFF switch (pattern select switch assembly) in TRC OFF mode or VSC OFF mode or turning the ignition switch off returns to the Normal mode.

        B0082JYE06
        Text in Illustration
        *a Normal Mode *b TRC OFF Mode
        *c VSC OFF Mode and TRC OFF Mode - -
        B0082MO VSC OFF Switch (Pattern Select Switch Assembly) Operation (Press and Hold for 3 Seconds or More) B0082JM VSC OFF Switch (Pattern Select Switch Assembly) Operation (Brief)

      6. The operations of the brake control functions in each mode are as follows:

        Mode Brake Control Function Combination Meter Assembly
        TRC VSC Slip Indicator Light TRC OFF Indicator Light VSC OFF Indicator Light
        Normal Mode Controllable Controllable - - -
        TRC OFF Mode Not Controllable Controllable - (Blinks)*1 Illuminates -
        VSC/TRC OFF Mode Not Controllable Not Controllable*2 - Illuminates Illuminates

        Tech Tips

        *1: When VSC is active

        *2: If there is a major variance between the left and right driving wheels, the brakes might be applied.

    2. VSC SPORT Switch (Pattern Select Switch Assembly)


      1. Use this VSC SPORT switch (pattern select switch assembly) to allow the skid control computer to switch VSC control between Normal Mode and SPORT Mode.

      2. Press the VSC SPORT switch (pattern select switch assembly) to switch VSC to SPORT Mode. When this happens, the driver will be informed that the vehicle is in VSC SPORT Mode by the illumination of the VSC SPORT indicator light and VSC OFF indicator light in the combination meter assembly.

      3. In VSC SPORT mode, the VSC function is set to operate at a timing suitable for sporty driving, and only brake control is performed (engine output control is not performed).

        B0082K1E03
        Text in Illustration
        *1 VSC SPORT Indicator Light *2 VSC SPORT Switch (Pattern Select Switch Assembly)

  4. CONSTRUCTION


    1. Steering Sensor


      1. The steering sensor detects the steering direction and angle, and sends this information to the skid control ECU.

        B0082IQE03
        Text in Illustration
        *1 Steering Sensor *2 Detection Gear
        *a Front - -

    2. Speed Sensor


      1. An active type speed sensor is used. This sensor contains a Hall IC.

      2. The sensor rotor, which consists of N and S poles that are arranged in a circle, is integrated with the hub bearing inner race.

      3. An active type speed sensor uses a Hall IC to detect magnetic field changes caused when the sensor rotor rotates, and the sensor outputs the detected information to the skid control ECU as digital pulses.

      4. To detect the vehicle speed, the frequency of the output pulses is used. Because the active sensor outputs vehicle speed pulses, the speed of the vehicle can be detected at speeds of 1.35 km/h (0.84 mph) or higher.

        B0082MCE18

    3. Brake Actuator Assembly


      1. The brake actuator assembly consists of the brake actuator portion and skid control ECU.

        B0082J1E02
        Text in Illustration
        *1 Brake Actuator Portion *2 Skid Control ECU
        *3 Right Rear Brake Pipe *4 Left Front Brake Pipe
        *5 Right Front Brake Pipe *6 Left Rear Brake Pipe
        *7 Master Cylinder Pipe (Primary Side) *8 Master Cylinder Pipe (Secondary Side)

      2. The actuator portion consists of 2 master cylinder cut solenoid valves, 2 reservoir cut solenoid valves, 4 pressure holding solenoid valves, 4 pressure reduction solenoid valves, 2 pumps, 2 reservoirs, and a master cylinder pressure sensor.

        B0082IUE02
        Text in Illustration
        *1 Brake Master Cylinder Sub-assembly *2 Brake Actuator Assembly
        *3 Master Cylinder Pressure Sensor *4 Master Cylinder Cut Solenoid Valve
        *5 Reservoir Cut Solenoid Valve *6 Pressure Holding Solenoid Valve
        *7 Pressure Reduction Solenoid Valve *8 Pump
        *9 Reservoir *10 Rear Brake Caliper (Right Side)
        *11 Front Brake Caliper (Left Side) *12 Front Brake Caliper (Right Side)
        *13 Rear Brake Caliper (Left Side) - -

  5. OPERATION


    1. ABS and EBD


      1. Based on the signals received from the 4 speed sensors, the skid control ECU calculates the speed of each wheel, and checks the wheel slipping conditions. In accordance with the slipping condition, the skid control ECU controls each solenoid valve in the brake actuator in order to adjust the fluid pressure of each wheel cylinder in the following 3 modes: pressure increase, pressure holding, and pressure reduction modes.

        B0082LXE03
        Text in Illustration
        *1 Pressure Holding Solenoid Valve *2 Pressure Reduction Solenoid Valve
        *3 Port A *4 Port B
        *a Pressure Increase Mode *b Pressure Holding Mode
        *c Pressure Reduction Mode *d to Wheel Cylinder
        *e from Wheel Cylinder - -
        Brake Actuator Operation in ABS and EBD
        Pressure Mode Increase Mode Holding Mode Reduction Mode
        Pressure Holding Solenoid Valve (Port A) Off (Open) On (Closed) On (Closed)
        Pressure Reduction Solenoid Valve (Port B) Off (Closed) Off (Closed) On (Open)
        Wheel Cylinder Pressure Increases Holds Reduces

    2. Brake Assist


      1. In the event of emergency braking, the skid control ECU determines the driver's intention based on the speed of the pressure increase in the master cylinder determined by the master cylinder pressure sensor signal. If the skid control ECU judges the need for additional brake assist, pressure is generated by the pump in the brake actuator and directed to the wheel cylinder to apply a large amount of fluid pressure.

        B0082LNE02
        B0082JAE02
        Text in Illustration (Brake Assist Operation:)
        *1 Brake Master Cylinder Sub-assembly *2 Brake Actuator Assembly
        *3 Master Cylinder Pressure Sensor *4 Pump
        *5 Reservoir *6 Rear Brake Caliper (Right Side)
        *7 Front Brake Caliper (Left Side) *8 Front Brake Caliper (Right Side)
        *9 Rear Brake Caliper (Left Side) - -

      2. Each valve operates as shown below:

        Item Port Brake Assist Not Activated Brake Assist Activated
        Master Cylinder Cut Solenoid Valves (1), (4) (A), (D) OFF (Open) ON*
        Reservoir Cut Solenoid Valve (2), (3) (B), (C) OFF (Closed) ON (Open)
        Front Brakes Pressure Holding Solenoid Valves (6), (7) (F), (G) OFF (Open) OFF (Open)
        Pressure Reduction Solenoid Valves (10), (11) (J), (K) OFF (Closed) OFF (Closed)
        Rear Brakes Pressure Holding Solenoid Valves (5), (8) (E), (H) OFF (Open) OFF (Open)
        Pressure Reduction Solenoid Valves (9), (12) (I), (L) OFF (Closed) OFF (Closed)
        Pump OFF ON

        Tech Tips

        *: The solenoid valve switches the hydraulic pressure between "open" and "closed" in accordance with the operating conditions by adjusting continually.

    3. TRC


      1. The fluid pressure generated by the pump is regulated by the master cylinder cut solenoid valve to the required pressure. Thus, the wheel cylinders of the drive wheels are controlled in the following 3 modes: pressure increase, pressure holding, and pressure reduction modes to control the slippage of the drive wheels.

        B0082LVE03
        B0082K5E02
        Text in Illustration (TRC Operation:)
        *1 Brake Master Cylinder Sub-assembly *2 Brake Actuator Assembly
        *3 Master Cylinder Pressure Sensor *4 Pump
        *5 Reservoir *6 Rear Brake Caliper (Right Side)
        *7 Front Brake Caliper (Left Side) *8 Front Brake Caliper (Right Side)
        *9 Rear Brake Caliper (Left Side) - -

      2. Each valve operates as shown below:

        Item Port TRC Not Activated TRC Activated
        Increase Mode Holding Mode Reduction Mode
        Master Cylinder Cut Solenoid Valve (1), (4) (A), (D) OFF (Open) ON* ON* ON*
        Reservoir Cut Solenoid Valve (2), (3) (B), (C) OFF (Closed) ON (Open) ON (Open) ON (Open)
        Front Brakes Pressure Holding Solenoid Valve (6), (7) (F), (G) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        Pressure Reduction Solenoid Valve (10), (11) (J), (K) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        Brake Wheel Cylinder Pressure - - - - - -
        Rear Brakes Pressure Holding Solenoid Valve (5), (8) (E), (H) OFF (Open) OFF (Open) ON (Closed) ON (Closed)
        Pressure Reduction Solenoid Valve (9), (12) (I), (L) OFF (Closed) OFF (Closed) OFF (Closed) ON (Open)
        Brake Wheel Cylinder Pressure - - - Increased Held Reduced
        Pump OFF ON ON ON

        Tech Tips

        *: The solenoid valve switches the hydraulic pressure between "open" and "closed" in accordance with the operating conditions by adjusting continually.

    4. VSC


      1. The VSC, by way of solenoid valves, controls the fluid pressure generated by the pump and applies it to the brake wheel cylinder of each wheel in the following 3 modes: pressure increase, pressure holding, and pressure reduction modes. As a result, the tendency to front wheel skid or rear wheel skid is controlled.

        B0082MHE04

      2. During front wheel skid restraining control, the brake for the right rear wheel on the inside of the turn will be applied. Brakes for all wheels may also be activated if necessary. The diagram below indicates hydraulic pressure pathways in pressure increase mode for controlling front wheel skid when the vehicle makes a right-hand turn. In other modes, the pressure holding valve and pressure reduction valve may be turned on or off as required by ABS and EBD activation patterns.

        B0082KUE02
        Text in Illustration (VSC Operation (Front Wheel Skid Restraining):)
        *1 Brake Master Cylinder Sub-assembly *2 Brake Actuator Assembly
        *3 Master Cylinder Pressure Sensor *4 Pump
        *5 Reservoir *6 Rear Brake Caliper (Right Side)
        *7 Front Brake Caliper (Left Side) *8 Front Brake Caliper (Right Side)
        *9 Rear Brake Caliper (Left Side) - -

      3. Each valve operates as shown below:

        Item Port VSC Not Activated VSC Activated
        Increase Mode Holding Mode Reduction Mode
        Master Cylinder Cut Solenoid Valve (1) (A) OFF (Open) ON* ON (Closed) ON*
        (4) (D) OFF (Open) OFF (Open) OFF (Open) OFF (Open)
        Reservoir Cut Solenoid Valve (2) (B) OFF (Closed) ON (Open) ON (Open) ON (Open)
        (3) (C) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        Front Brakes Pressure Holding Solenoid Valve (6) (F) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        (7) (G) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        Pressure Reduction Solenoid Valve (10) (J) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        (11) (K) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        Brake Wheel Cylinder Pressure Right - - - Increased Held Reduced
        Left - - - - - -
        Rear Brakes Pressure Holding Solenoid Valve (5) (E) OFF (Open) OFF (Open) ON (Closed) ON (Closed)
        (8) (H) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        Pressure Reduction Solenoid Valve (9) (I) OFF (Closed) OFF (Closed) OFF (Closed) ON (Open)
        (12) (L) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        Brake Wheel Cylinder Pressure Right - - - Increased Held Reduced
        Left - - - - - -
        Pump OFF ON ON ON

        Tech Tips

        *: The solenoid valve switches the hydraulic pressure between "open" and "closed" in accordance with the operating conditions by adjusting continually.

      4. During rear wheel skid restraining control, the brake for the front wheel on the outside of the turn will be applied. The diagram below indicates hydraulic pressure pathways in pressure increase mode for controlling rear wheel skid when the vehicle makes a right-hand turn. In other modes, the pressure holding valve and pressure reduction valve may be turned on or off as required by ABS and EBD activation patterns.

        B0082M0E02
        Text in Illustration (VSC Operation (Rear Wheel Skid Restraining):)
        *1 Brake Master Cylinder Sub-assembly *2 Brake Actuator Assembly
        *3 Master Cylinder Pressure Sensor *4 Pump
        *5 Reservoir *6 Rear Brake Caliper (Right Side)
        *7 Front Brake Caliper (Left Side) *8 Front Brake Caliper (Right Side)
        *9 Rear Brake Caliper (Left Side) - -

      5. Each valve operates as shown below:

        Item Port VSC Not Activated VSC Activated
        Increase Mode Holding Mode Reduction Mode
        Master Cylinder Cut Solenoid Valve (1), (4) (A), (D) OFF (Open) ON* ON (Closed) ON*
        Reservoir Cut Solenoid Valve (2), (3) (B), (C) OFF (Closed) ON (Open) ON (Open) ON (Open)
        Front Brakes Pressure Holding Solenoid Valve (6) (F) OFF (Open) OFF (Open) ON (Closed) ON (Closed)
        (7) (G) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        Pressure Reduction Solenoid Valve (10) (J) OFF (Closed) OFF (Closed) OFF (Closed) ON (Open)
        (11) (K) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        Brake Wheel Cylinder Pressure Right - - - - - -
        Left - - - Increased Held Reduced
        Rear Brakes Pressure Holding Solenoid Valve (5) (E) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        (8) (H) OFF (Open) ON (Closed) ON (Closed) ON (Closed)
        Pressure Reduction Solenoid Valve (9) (I) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        (12) (L) OFF (Closed) OFF (Closed) OFF (Closed) OFF (Closed)
        Brake Wheel Cylinder Pressure Right - - - - - -
        Left - - - - - -
        Pump OFF ON ON ON

        Tech Tips

        *: The solenoid valve switches the hydraulic pressure between "open" and "closed" in accordance with the operating conditions by adjusting continually.

  6. FAIL-SAFE


    1. If a failure occurs in the skid control ECU, sensors, or brake actuator assembly, the system continues performing brake control by excluding the failed area and using only the areas that are operating normally.

  7. DIAGNOSIS


    1. If the skid control ECU detects a malfunction in the brake control system, the warning lights or indicator light illuminate. At the same time, a Diagnostic Trouble Code (DTC) is stored in the memory of the skid control ECU.

    2. This system has a sensor signal check (test mode) function.

    3. For details of DTCs and the check function, refer to the Repair Manual.