SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 408

ABS/ESP SYSTEM

STAVIC - 2004.09

15

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

(Pumping)

When the cam pushes the left plunger during motor operation,
the system pressure is generated in the left cylinder. At this
time, the right plunger is expanded by spring force and the
expanded volume of the right cylinder draws the brake fluid.

ECU (Including Solenoid Valves –
ESP Equipped Model)

HECU controls the hydraulic valves by supplying or cutting off
the voltage to solenoid valves depending on the wheel speed
and other information from wheel speed sensors.

The figure shown in left side is for ESP ECU. There are two
channels for front wheels and one channel for rear wheels.
Each channel has one inlet and one outlet valve, therefore,
there are six solenoid valves.

(ECU lower cover)

The electrical components are weak to moisture. To protect
ECU, GoreTex-based  plate is used at ECU lower cover. The
vent hall (arrow) allows air to ventilate but does not allow mois-
ture to penetrate.

ABS/ESP SYSTEM

STAVIC - 2004.09

16

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

Active Wheel Speed Sensor

Function of Active Wheel Sensor

The speed sensor used in traditional ABS is made of permanent magnet and transmits the output voltage that changes
as the wheel rotor rotates to the HECU system. New wheel speed sensor detects the wheel speed through the current
value that depends on the resistance that changes according to the magnetic field by using four resisters and supplying
the 12 V power supply to the sensor.

Active type wheel speed sensor generate square wave insteal of sine wave

<Wheatstone bridge>

< Front wheel speed sensor >

< Rear wheel speed sensor >

< Active type >

Specifications

DC 12V

Front: 0.335 ~ 0.945 mm

Rear: 0.309 ~ 0.958 mm

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

Front: 19 ~ 25 Nm

Rear: 6 ~ 10 Nm

Reference

Cannot measure the air gap

   7.5 ~ 20 V

 Item

Supplying voltage

Air gap

 Output current (vehicle speed: at 2.75 km/h)

 Tightening torque

Specifications

ABS/ESP SYSTEM

STAVIC - 2004.09

17

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

7. REMOVAL AND INSTALLATION

HECU Assembly

Preceding Work: Disassemble the battery negative

cable.

1. Unscrew battery mounting bracket bolts (12 mm - 2EA)

and remove battery assembly.

2. Unscrew preheating relay mounting bracket bolts (12 mm

- 2EA) and battery tray mounting bolts (12 mm - 4EA).

3. Disconnect the control unit connector.

ABS/ESP SYSTEM

STAVIC - 2004.09

18

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

4. Disconnect the primary and secondary master cylinder

pipes from HECU.

5. Disconnect the front and rear wheel brake pipes.

 [Notice]

Be careful not to damage the HECU pipe and nut thread when reinstall.

7. Install in the reverse order of removal.

8. After reinstallation, add some oil and perform the brake

air bleeding.

6. Unscrew the HECU mounting nuts (2EA), and remove it.

Secondary

Primary

FL: Front Left

FR: Front Right

Tightening torque

15 ~ 19 Nm

[Notice]

When you install a new HECU to the vehicle, Coding is excuted automatically.

Tightening torque

15 ~ 19 Nm

Front Rear RH/LH

[Notice]

Do not attempt to disassemble the HECU assembly.

Wrap the end of pipes and HECU to prevent comtaminating.