SsangYong Stavic / SsangYong Rodius (2005 year). Service manual — part 414
ABS/ESP SYSTEM
STAVIC - 2004.09
39
4K
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
40
4K
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
41
4K
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Connector
ABS ECU
O
O
-
O
-
-
-
-
-
-
O
-
-
-
O
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 ~ 18 V
0 V
-
-
0 ~ 18 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
10
11
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
-
3 ~ 45 mA
3 ~ 45 mA
-
-
Max. 10 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
42
4K
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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