Lexus ES300 (2002 year). Manual — part 107
CHASSIS – BRAKE
CH-63
170CH07
Braking
Force
Braking
Force
Making a Right Turn
Oversteering
Control Moment
2) Dampening a Strong Oversteer
When the skid control ECU determines that
the vehicle exhibits a strong tendency to
oversteer, depending on the extent of that
tendency, it controls the engine output and
applies the brakes of the front and rear wheels
of the outside of the turn, thus generating an
inertial moment in the vehicle’s outward
direction, which helps dampen its tendency to
oversteer.
CHASSIS – BRAKE
CH-64
211CH31
TRAC OFF Indicator Light
VSC Warning Light
Slip Indicator Light
ABS Warning
Light
Brake System
Warning Light
Steering Angle Sensor
TRAC OFF Switch
VSC Warning Buzzer
Skid Control ECU
Brake Actuator
Front Speed Sensor
Yaw Rate & Deceleration Sensor
Rear Speed Sensors
Stop Light Switch
Front Speed Sensor
Solenoid Relay
Motor Relay
6. Layout of Component
CHASSIS – BRAKE
CH-65
Brake Actuator
7. Function of Component
Component
Function
ABS Warning Light
Lights up to alert the driver when the skid control ECU detects the
malfunction in the ABS or Brake Assist system.
VSC Warning Light
Lights up to alert the driver when the skid control ECU detects the
malfunction in the VSC system.
Combination
Slip Indicator Light
Blinks to inform the driver when the TRAC system or the VSC
system is operated.
Combination
Meter
TRAC OFF
Indicator Light
Lights up to inform the driver when the TRAC system is turned
OFF by the TRAC OFF switch.
Lights up to inform the driver when the skid control ECU
detects the malfunction in the TRAC or VSC system.
Brake System
Warning Light
Lights up together with the ABS warning light to alert the driver
when the skid control ECU detects the malfunction in the EBD
control.
ECM
Sends the throttle valve opening angle signal, crankshaft
position sensor, intake air temp. sensor, etc., to the skid control
ECU.
Receive the signal of throttle valve opening request from the
skid control ECU.
Speed Sensors
Detects the wheel speed of each four wheels.
Charges the fluid path based on the signals from the skid control
ECU during the operation of the ABS with EBD & Brake Assist
& TRAC & VSC system, in order to control the fluid pressure that
is applied to the wheel cylinders.
Master Cylinder
Pressure Sensor
Assembled in the brake actuator and detects the master cylinder
pressure.
Skid Control ECU
Judges the vehicle driving condition based on signals from each
sensor, and sends brake control signal to the brake actuator.
Brake Fluid Level Warning Switch
Detects the brake fluid level.
Stop Light Switch
Detects the brake pedal depressing signal.
TRAC OFF Switch
Turns the TRAC system inoperative.
VSC Warning Buzzer
Emits an intermittent sound to inform the driver that the skid
control ECU detects the strong understeer tendency or strong
oversteer tendency.
Yaw Rate
&
Deceleration Sensor
Detects the vehicle’s yaw rate.
Detects the vehicle’s acceleration in the forward, rearward,
lateral.
Steering Angle Sensor
Detects the steering direction and angle of the steering wheel.
Motor Relay
Supply power to the pump motor in the brake actuator.
Solenoid Relay
Supply power to the solenoid valves in the brake actuator.
CHASSIS – BRAKE
CH-53
208CH22
Speed Sensors
Speed Sensors
Brake Fluid Level
Warning Switch
Stop Light Switch
Brake
Actuator
Skid
Control
ECU
DLC3
Speedometer
ABS Warning Light
Brake System
Warning Light
Combination Meter
ABS with EBD System
1. General
The primary purpose of the ABS has been to help the vehicle’s behavior during braking.
The EBD control utilizes ABS, realizing the proper brake force distribution between front and rear wheels
in accordance with the driving conditions.
In addition, during cornering braking, it also controls the brake forces of right and left wheels, helping to
maintain the vehicle behavior.
2. System Diagram
3. Outline of EBD Control
General
The distribution of the brake force, which was performed mechanically in the past, is now performed under
electrical control of the skid control ECU, which precisely controls the braking force in accordance with
the vehicle’s driving conditions.
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