SsangYong Rodius (2013 year). Manual - part 163

09-5

4891-01

2. FUNCTION

1) Term Definition

ABS: Anti-Lock Brake System

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When the brake pedal is abruptly depressed, the HECU calculates the slip ratio of each wheel based 

on information received from the wheel speed sensors and controls the hydraulic module data quickly 

and precisely in order to maintain the friction between the road surface and tire optimal (static friction). 

Therefore, by keeping the friction between the road surface and tire optimal, it is possible to obtain 

following effects: Enhanced steering stability, improved direction stability, reduced stopping distance 

and etc.

EBD: Electronic brake-Force Distribution

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This is to detect the tire speed from the wheel speed sensor in order to supply the braking pressure to 

the rear tires individually. In other words, the HECU measures the tire deceleration speed continuously 

and controls the rear inlet valve on the hydraulic modulator to obtain optimal braking force as much as 

possible. Thereby, stopping distance, braking effect and straight stability are improved.

ESP: Electronic Stability Program 

▶

This is used to make the vehicle stabilized to recognize the emergency driving conditions, and to 

control the brake for each wheels and the engine power when the brake system or acceleration will not 

work any more in dangerous circumstances. 

TCS: Traction Control System 

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When the wheel is slipping due to an excessive engine torque while starting off or driving, this controls 

the driving force (braking force + engine torque) in order to prevent the wheel from slipping through the 

engine or brake control. 

AYC: Active Yaw Control

▶

This has been developed to help a driver avoid danger of losing control of the vehicle stability due to 

understeer or oversteer during cornering, which is a part of the ESP function. 

HBA: Hydraulic Brake Assistant

▶

Developed based on the fact that elderly drivers depress the brake pedal too soft even when hard 

braking is necessary, this an assist system to operate the HECU drive motor immediately and apply 

high braking force to the wheels when the brake pedal is depressed softly and the vehicle should be 

braked in emergency.

ARP: Active Rollover Protection

▶

This is a supplementary device for safety in ESP system and can help minimize the rollover accidents 

by detecting a potential rollover situation through the brake and engine control when making sudden 

lane change or turning sharply by adding only the software, without any separate device or switch.

09-6

2) Component Overview By System

Function

Vehicle with ABS

Vehicle with ESP

ABS

Yes

Yes

EBD

Yes

TCS

No

AYC

HBA

ARP

3) Part Overview By System

Part

Vehicle with ABS

Vehicle with ESP

HECU

Yes

Yes

Front wheel speed sensor

Rear wheel speed sensor

ABS warning lamp

EBD indicator lamp

G sensor (integrated in HECU)

4WD: Yes, 2WD: No

No

Sensor cluster (Yaw rate sensor + 

lateral sensor+ G sensor)

No

Yes

ESP operation indicator lamp and 

warning lamp

ESP OFF switch and indicator

Steering wheel angle sensor

09-7

4891-01

3. PRECAUTIONS

The warning lamp flashes and warning beep sounds when the ESP is operating

When the ESP operates during vehicle movement, the ESP warning lamp on the instrument 

panel flashes and beep comes on every 0.1 second. The ESP system is only a supplementary 

device for comfortable driving. When the vehicle exceeds its physical limits, it cannot be 

controlled.

Do not rely on the system. Keep on the safe driving.

Feeling when ESP is working

When the ESP system activates, the feeling can be different depending on vehicle driving 

conditions.

For example, you will feel differently when the ESP system is activated during the ABS is 

operating with the brakes applied and when the brakes are not applied on a curve.

If the ESP system operates when the brake is applied, the brake pressure will be increased on 

the corresponding wheel which already has braking pressure for the ESP controls.

Noise and vibration that driver feels when ESP system is operating

The ESP system may transfer noise and vibration to the driver due to the pressure changes 

caused by the motor and valve operations in a very short period of time. And, keep in mind that 

the output and vehicle speed could be decreased without rpm increase due to the ASR function 

that controls the engine power.

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ARP Operation

During the ARP operation, vehicle safety (rollover prevention) takes the first priority and thus, 

stronger engine control is in effect. Consequently, the vehicle speed decreases rapidly, so the 

driver must take caution for the vehicle may drift away from the lane.

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09-8

Steering wheel angle sensor

Appearance change due to changed multifunction switch

4. CHANGES IN ESP

Steering wheel angle sensor changed

▶

Wheel speed sensor changed

▶

Wheel speed sensor

Front

Rear

Front

Rear

Connector's appearance and length changed

Sensor cluster changed

▶

Sensor cluster

Appearance and its connector (6-pin → 4-pin) changed