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SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 414

ABS/ESP SYSTEM

STAVIC - 2004.09

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

6. COMPONENTS DESCRIPTION

HECU (Hydraulic and Electronic Control Unit)

HECU Installed in a Vehicle

HECU consists of motor pump, solenoid valve and ECU.

ECU connector has 47 pins and the number of valves in valve body is 12 when equipped with ESP(6 valve for ABS/EBD),
and they cannot be disassembled.

Comparison between ESP HECU and ABS/EBD HECU

RL: Rear left

RR: Rear right

FL: Front left

FR: Front right

Secondary

Primary

ABS/EBD HECU (2 ports 3 chnnels)

ESP HECU (2 ports 4 chnnels)

ABS/ESP SYSTEM

STAVIC - 2004.09

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

ECU (Electronic Control Unit)

The electronic control unit performs the following functions:

- controlling the ABS and ESP

- cotinuous monitoring of all electrical components

In the integrated control unit, the coils of the solenoid valves
are integrated into the control unit housing. The necessary
relays are mounted on the circuit board of the electronic con-
trol unit.

- yaw rate

- G sensor

- lateral/longitudinal acceleration

- pressure in hydraulic system

- wheel speed

- reference speed

- deceleration

- slip

# ABS control

If during braking, one wheel speed deviates from the reference
speed, the ABS control unit attempts to correct that wheel by
modulating the brake pressure until it again matches the ref-
erence speed. When all four wheels tend to lock, all four wheels
speeds suddenly deviate from the previously determined ref-
erence speed. In that case, the control cycle is initiated again
in order to again correct the wheel speed by modulating the
brake pressure.

Hydraulic Control Unit

The pump and the valve body are grouped together in one
housing, forming one compact unit with the electric motor.

Four pairs of valves (4 inlet valves, 4 outlet valves) are provided
for modulating the pressure at the wheels plus two isolating
valves and two electrically operated shuttle valves.

Mote pump

Valve body

Brake pressure

Reference speed

Vehicle speed

Wheel speed

ABS/ESP SYSTEM

STAVIC - 2004.09

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

Connector

ABS ECU

O
O

-
-
-

O
O

-
-
-

-
-
-
-

-
-
-
-
-

-
-
-

O
O

-
-
-

O
O
O
O

O
O
O

Voltage Range

0 ~ 18 V
0 ~ 18 V

0 ~18 V

0 ~ 18 V

0 V

0 ~ 18 V
0 ~ 18 V

-
-
-

0 ~ 18 V

-
-
-

0 ~ 18 V

0 V

5 V
0 V

5 V
0 V
5 V
5 V

0 ~ 18 V

-
-

1.3 ~ 4.1 V

0 ~ 18 V

1.3 ~ 4.1 V

0 V

0 ~ 18 V

0 V

0 ~ 18 V

0 V

-
-

0 ~ 18 V

0 V

0 ~ 18 V
0 ~ 18 V

0 ~ 18 V

0 V
0 V

Name

Battery (B+)
Self diagnosis (K-Line)
Steering wheel angle sensor (STN)

IGN1
Steering wheel angle sensor ground
Sensor cluster power
Steering wheel angle sensor power

-
-
-

CAN (High)

-
-
-

CAN (Low)
Ground

Pressure sensor (No.1) power
Pressure sensor (No.1) ground

Pressure sensor (No.1) signal
Pressure sensor (No.2) ground
Pressure sensor (No.2) power
Pressure sensor (No.2) signal

Sensor cluster CAN (Low)

-
-

Steering wheel angle sensor (ST2)

Sensor cluster CAN (HIGH)
Steering wheel angle sensor (ST1)
Sensor cluster ground
Battery (B+)

Wheel speed sensor ground (FR)
Wheel speed sensor ground signal (FR)

Wheel speed sensor ground signal (RL)
Wheel speed sensor ground ground (RL)

-
-

ESP OFF switch

Stop lamp switch
Wheel speed sensor ground ground (RR)
Wheel speed sensor ground signal (RR)
ABS warning lamp
Wheel speed sensor ground signal (FL)
Wheel speed sensor ground ground (FL)

Ground

Pin no.

1
2
3

4
5
6
7

8
9

12
13
14
15
16

17
18
19

20
21
22
23

24
25
26
27
28

29
30
31
32

33
34
35
36
37

38
39
40

41
42
43
44

45
46
47

Current Tange

Max. 30 A

Max.100 mA

Max. 10 mA

Max. 200 mA
Max. 100 mA
Max. 250 mA

Max. 10 mA

-
-
-

Max. 100 mA

-
-
-

Max. 100 mA

Max. 20 A

Max. 20 mA
Max. 20 mA

Max. 10 mA
Max. 20 mA
Max. 20 mA
Max. 10 mA

Max. 10 mA

-
-

Max. 10 mA

Max. 10 mA
Max. 10 mA

Max. 250 mA

Max. 20 A

3 ~ 45 mA
3 ~ 45 mA

-
-

Max. 10 mA

3 ~ 45 mA
3 ~ 45 mA

Max. 20 mA

3 ~ 45 mA
3 ~ 45 mA

Max. 30 A

ABS/ESP SYSTEM

STAVIC - 2004.09

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

Wheel Speed Sensor

Active Wheel Sensor

- Measuring bridge with four resisters

- Measuring the current

- Supplying the voltage (12 V)

- Amplifier/comparison measuring device

Function of Active Sensor System

The basic tone wheel and the magnetized encoder wheel to
activate the sensor. When the vehicle is moving, the sine wave
signal is changed in the magnetic field of wheatstone bridge
due to the rotation of tone wheel. This can be done directly by
ABS control unit.

Active Sensor Element of Encoder Wheel

This sensor has the measuring bridge integrated plastic hous-
ing and is fixed to small permanent magnet. Four lead wires
that receive electrical output value are connected to the IC
integrated plastic housing. Two connecting pins are used for
signal output and voltage supply.

Specifications

DC 12 V

Front: 0.335 ~ 0.945 mm

Rear: 0.309 ~ 0.958 mm

7 mA (Lo) ~ 14 mA (Hi) +20 % / -16 %

Front: 19 ~ 25 Nm

Rear: 6 ~ 10 Nm

Reference

Cannot measure the air gap

7.5 ~ 20 V

Description

Supplying voltage

Air gap

Output current

(vehicle speed at 2.75 Km/h)

Tightening torque

Permanent
magnet

Sensor filament

Specifications

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