SYSTEM DESCRIPTION
1. FUNCTION DESCRIPTION
(a) ABS (Anti-lock Brake System)
(1) The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking on a slippery surface.
(b) EBD (Electronic Brake force Distribution)
(1) The EBD control utilizes ABS, and performs proper brake force distribution between the front and rear wheels in accordance with driving conditions. When braking while cornering, it also controls the brake forces of the right and left wheels, helping to maintain vehicle stability.
(c) BA (Brake Assist)
(1) The primary purpose of the brake assist system is to provide auxiliary brake force to assist the driver if the driver cannot generate a large enough brake force during emergency braking, thus helping to maximize the brake performance of the vehicle.
(d) TRAC (Traction Control)
(1) The TRAC system helps prevent the drive wheels from slipping when the driver depresses the accelerator pedal excessively when starting off or accelerating on a slippery surface.
(e) VSC (Vehicle Stability Control)
(1) The VSC system helps prevent the vehicle from slipping sideways as a result of strong front or rear wheel skid during cornering.
(f) AUTO-LSD (Auto Limited Slip Differential)
When the vehicle is in H2 (2WD) mode, the AUTO LSD will operate with the VSC OFF switch on (TRAC OFF mode (AUTO LSD control)) and the accelerator pedal depressed.
The AUTO LSD system is used to apply brake pressure and limit differential slippage, thus transmitting drive torque to the other drive wheel to ensure traction when starting under the following conditions:
HINT:
The AUTO LSD system operates when H2 (2WD) mode is selected.
(g) Hill-start Assist Control
(1) When starting uphill, this control maintains the brake hydraulic pressure to the 4 wheels, in order to momentarily help to prevent the vehicle from descending backward.
(h) Trailer Sway Control
(1) If the vehicle is towing a trailer with an inappropriate hitch load, trailer sway could be caused by crosswinds, imbalance caused by the load, or the driver's steering. Trailer sway control reduces trailer sway by controlling the engine output and the braking of each wheel.
2. FUNCTION OF COMPONENTS
Component |
Function |
|
---|---|---|
Brake Actuator Assembly |
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 assembly. |
Master Cylinder Pressure Sensor |
Assembled in the brake actuator assembly, detects the master cylinder pressure. |
|
Pump Motor |
Drives the pumps inside the brake actuator assembly. |
|
Solenoid Valves |
|
|
Skid Control ECU |
Motor Relay |
Supplies power to the pump motor. |
Solenoid Relay |
Supplies power to the solenoid valves. |
|
Speed Sensor |
Detects the wheel speed of each of the 4 wheels. |
|
VSC OFF Switch |
Switches off the TRAC and VSC operation. |
|
Stop Light Switch Assembly |
Detects the brake pedal depressing signal. |
|
ECM |
|
|
Airbag Sensor Assembly |
Yaw Rate and Acceleration Sensor |
|
Spiral cable with sensor sub-assembly |
Steering Angle Sensor |
Detects the steering direction and angle of the steering wheel. |
Combination Meter Assembly |
ABS Warning Light |
|
Brake Warning Light |
|
|
TRAC OFF indicator light |
|
|
VSC OFF Indicator Light |
|
|
Slip Indicator Light |
|
|
AUTO LSD indicator light |
Illuminates to inform the driver that AUTO LSD is ready to operate. |
|
VSC Warning Buzzer |
|
|
Brake Master Cylinder Reservoir Assembly |
Brake Fluid Level Warning Switch |
Detects the brake fluid level. |
Millimeter Wave Radar Sensor Assembly |
Sends brake request signals to the skid control ECU. |
Acceleration Sensor Stuck Malfunction (C1232,C1243,C1245,C1279)
DESCRIPTION
The skid control ECU (master cylinder solenoid) receives signals from the yaw
rate and acceleration (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and
detects the vehicle's condition using 2 ...
Fail-safe Chart
FAIL-SAFE CHART
1. PULSE FAILURE OR DISPLACEMENT OF NON-DETECTION RANGE TO THE OPENING DIRECTION
(a) If the pulse sensor built into the power window regulator motor malfunctions,
the power window control system enters fail-safe mode.
Power Window Regulator Master Switch Assembly, Front Power Wi ...
Brake Warning Light does not Come ON
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination
meter assembly via CAN communication.
WIRING DIAGRAM
Refer to Brake Warning Light Remains ON (See page
).
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly) ...