SsangYong Korando III (2010 year). Manual — part 241

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2) EBD (Electronic Brake-force Distribution) Warning Lamp (Brake
Warning Lamp)

EBD warning lamp when the system perform the self diagnosis and when it detects the malfunction of

EBD system. However, the brake warning lamp comes on regardless of EBD when the parking brake is

applied.

EBD warning lamp ON:

When turning the ignition switch to ON position, ABS warning lamp and the brake warning lamp

comes on for 3 seconds for self diagnosis and goes off if the system is OK (initialization mode).

When applying the parking brake, the brake warning lamp comes on.

When the brake fluid is not sufficient, the brake warning lamp comes on.

When the self-diagnosis is performing, the warning lamp comes on.

When the HECU connector is disconnected, the warning lamp comes on.

When the system is defective, ABS warning lamp and the brake warning lamp come on

simultaneously.

1.

2.

3.

4.

5.

6.

When the solenoid valve is defective

When one or more wheel sensors are defective

When ABS HECU is defective

When the voltage is abnormal

When valve relay is defective

a.

b.

c.

d.

e.

When the communication between warning lamp CAN module in meter cluster, the warning lamp

comes on.

7.

3) ESP OFF Indicator

ESP OFF indicator ON:

When turning the ignition switch to ON position, ESP warning lamp comes on for 3 seconds for self

diagnosis and goes off if the system is OK (initialization mode).

When the ESP OFF switch is pressed to turn off ESP function, ESP OFF indicator comes on.

1.

2.

4) ESP Warning Lamp

ESP warning lamp ON:

When turning the ignition switch to ON position, ESP warning lamp comes on for 3 seconds for self

diagnosis and goes off if the system is OK (initialization mode).

When the system is defective, the warning lamp comes on.

When the ESP function is activated, ESP warning lamp blinks with the interval of 2 Hz.

When the communication between warning lamp CAN module in meter cluster, the warning lamp

comes on.

1.

2.

3.

4.

5.

5) ESP OFF Switch

If ESP OFF switch is pressed, ESP function is deactivated and the ESP OFF indicator in the instrument

cluster comes on.

To resume the ESP function, press the switch again. At this time, ESP OFF indicator goes out.

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5. SYSTEM DESCRIPTION

1) Block Diagram of ESP HECU

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2) Operation of ESP System

The ESP (Electronic Stability Program) has been developed to help a driver avoid danger of losing

control of the vehicle stability due to understeer or oversteer during cornering. The yaw rate sensor,

lateral sensor and longitudinal sensor in the sensor cluster and the steering wheel angle sensor under

the steering column detect the vehicle conditions when the inner or outer wheels are spinning during

oversteer, understeer or cornering. The ESP ECU controls against oversteer or understeer during

cornering by controlling the vehicle stability using input values from these sensors and applying the

braking force to the corresponding wheels independently. The system also controls the engine power

right before the wheel spin synchronized with the ASR function to decelerate the vehicle automatically in

order to maintain the vehicle stable during cornering.

(1) Under steering

What is understeering?

▶

Understeer is a term for a condition in which the steering wheel is steered to a certain angle during driving

and the front tires slip toward the reverse direction of the desired direction. Generally, vehicles are

designed to have understeer. It is because that the vehicle can return back to inside of cornering line

when the steering wheel is steered toward the inside even when the front wheels are slipped outward.

As the centrifugal force increases, the tires can easily lose the traction and the vehicle tends to slip

outward when the curve angle gets bigger and the speed increases.

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ESP controls during understeer

▶

The ESP system recognizes the directional angle with the steering wheel angle sensor and senses the

slipping route that occurs reversely against the vehicle cornering direction during understeer with the yaw

rate sensor and lateral sensor. Then, the ESP system applies the braking force to the rear inner wheel to

compensate the yaw moment value. In this way, the vehicle does not lose its driving direction and the

driver can steer the vehicle as intended.

(2) Over steering

What is oversteering?

▶

Oversteer is a term of a condition in which the steering wheel is steered to a certain angle during driving

and the rear tires slip outward losing traction.

Compared to understeering vehicles, it is hard to control the vehicle during cornering and the vehicle can

spin due to rear wheel moment when the rear tires lose traction and the vehicle speed increases.

ESP controls during oversteer

▶

The ESP system recognizes the directional angle with the steering wheel angle sensor and senses the

slipping route that occurs towards the vehicle cornering direction during oversteer with the yaw rate

sensor and lateral sensor. Then the ESP system applies the braking force to the front outer wheel to

compensate the yaw moment value. In this way, the vehicle does not lose its driving direction and the

driver can steer the vehicle as intended.