SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 416

ABS/ESP SYSTEM

STAVIC - 2004.09

47

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

Installation position

• Tuning forks vertical

• Required accuracy of position: max. ± 3° tolerance to

maintain full comfort

• Failure to maintain the specified installation position will

result in asymmetrical control

These sensors sense the lateral/longitudinal acceleration of
the vehicle and located in sensor cluster. For 4WD vehicle,
the longitudinal sensor is located in sensor cluster and the
functions are same only except the direction. The lateral ac-
celeration sensor detects the movement of lateral direction
and the longitudinal acceleration sensor detects the move-
ment of longitudinal direction (driving direction).

Between two electrically charged stationary plates having the
same polarity, an electrically charged silicon element having
the opposite polarity is attached to the end of a cantilever
arm. Between these three plates, two electric fields are gen-
erated by the capacitors C1 and C2. The capacitances of C1
and C2 change in response to lateral acceleration. This change
can be used to calculate the direction and amount of lateral/
longitudinal acceleration acting on the vehicle. For 0 g lateral
acceleration, the sensor produces an output signal with a volt-
age of 2.5 V.

Lateral/Longitudinal Acceleration
Sensor

The signal of the lateral acceleration sensor alone cannot trig-
ger an ESP intervention.

The ESP sensor cluster can be considered as one module.
The measured value by lateral/longitudinal and yaw rate sen-
sors is transmitted to ESP unit via two CAN lines.

When a sensor is faulty, the sensor cluster produces an out-
put signal of 0 V (fail safe function).

ABS/ESP SYSTEM

STAVIC - 2004.09

48

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

Pressure Sensor

1. Master cylinder

2. Primary pressure sensor

3. Second pressure sensor

4. Inside of pressure sensor

5. Connector

Location

Pressure Sensor Circuit

Specifications

Power

Ground

Signal output

<Primary pressure sensor>

Power

Ground

Signal output

<Secondary pressure sensor>

<ESP unit>

• HBA operating conditions with output value from

pressure sensor:

 - pressure: 20 bar

 - pressure deviation: over 1500 bar/sec

 - vehicle speed: over 7 km/h

Specifications

4.75 ~ 5.25 V

0.25 ~ 4.75 V

2.5 V

Descriptions

Supplying voltage

Output range

Output voltage when stop

ABS/ESP SYSTEM

STAVIC - 2004.09

49

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

Brake not
applied

Brake
applied

d. When brake pressure is applied from the master cylinder,

the ceramic disk moves towards the fixed ceramic disk
and the electric charge volume changes accordingly.

c. The pressure sensors operate on the principle of changing

capacitance (a).

The distance (s) between the disks and, thus, the
capacitance changes when pressure is applied to the
movable disk by a braking intervention.

b. The sensor consists of two ceramic disks, one of which

is stationary and the other movable. The distance
between these disks changes when pressure is applied.

a. The pressure sensor senses the driver’s braking

intentions (braking while an ESP intervention is in
progress) and detects the precharging pressure.

Description

ABS/ESP SYSTEM

STAVIC - 2004.09

50

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

If two signals from pressure sensor deviates from the specified value, HECU determines the sensor is faulty. The sensor
output is analog signal that is proportional to voltage and the HECU recognized the pressure value as signal value
against supplying voltage.

Maximum measurable pressure: 170 bar

Linear changes of about 0.5 volts when the brake is not operating and 4.75 volts when the brake is operating.