SsangYong Korando III (2010 year). Manual — part 546
11-4
ABS / ESP
CBS
Circuit diagram of wheel speed sensor
▶
11-5
4890-00
1. SYSTEM OVERVIEW
1) What is ABS?
When braking suddenly or braking on slippery roads, the vehicle keeps moving forward but the wheels
are locking and not rotating. If these happen, the vehicle may lose stability or rotate resulting in an
accident. ABS helps to maintain directional stability and control of the vehicle. ABS is designed to
secure more safety and increase the control of steering wheel during emergency braking situation. But,
ABS does not guarantee perfect safety beyond its physical limit. ABS in this vehicle contains EBD
function. In normal driving conditions, the brake system operates without ABS function.
2) What is EBD (Electronic Brake-force Distribution)?
EBD is an automobile brake technology that automatically varies the amount of force applied to each of a
vehicle's brakes, based on road conditions, speed, loading, etc. Always coupled with anti-lock braking
systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping
power whilst maintaining vehicular control. EBD does not operate when ABS is working.
ABS effect according to braking conditions
▶
Braking on split road
Maneuvering while braking
11-6
3. G-sensor (for 4WD)
Located on the floor under
parking brake bracket in center
console.
4. Rear wheel speed sensor
(for 2WD)
Located on knuckle. The
appearance is different from that
for 4WD.
4. Wheel speed sensor
(for 4WD)
Located on knuckle. The
appearance of front sensor is
same with rear sensor.
2. ABS warning lamp
EBD warning lamp (ABS warning lamp +
Brake warning lamp)
1. ABS hydraulic device and control unit
Located under the power steering fluid reservoir and
contains the pressure sensor.
2. COMPONENT
11-7
4890-00
4WD - Front/Rear wheel speed
sensor
2WD - Front wheel speed sensor
2WD - Rear wheel speed sensor
ECU (Electronic Control Unit)
1.
ECU calculates the wheel speed, acceleration and
deceleration with the information from wheel
speed sensor, and determines the wheel slip to
control the valve and motor.
HU (Hydraulic Unit)
2.
The hydraulic circuit contains the primary circuit
and secondary circuit for ABS operation. This unit
controls the hydraulic pressure to each wheel. If
the system needs ABS operation, the valves in
the unit operate to control HOLD, RISE and
DUMP according to ECU control logic.
Motor
3.
The motor is operated when ABS is activated. The
cam-shaped output shaft of the motor enables the
brake system to receive and supply the brake fluid
during the motor operation.
Wheel speed sensor
▶
Wheel speed sensor sends the data detected by
tone wheel to HECU.
HECU
▶
Rear wheel speed sensor in 2WD vehicle is
different from that in 4WD vehicle.
Location of rear tone wheel (A) and wheel
sensor (B) in 2WD vehicle
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