Ford Galaxy / Ford S-MAX. Manual — part 87

Anti-Lock Control - Stability Assist - Anti-
Lock Control - Stability Assist

S-MAX/Galaxy 2006.5 (02/2006-)

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Description and Operation

Description

Yaw rate sensor and accelerometer

Steering wheel rotation sensor

Hydraulic control unit (HCU) and stability assist module assembly

The stability assist module adds a further function known as electronic stability program
(ESP) to the anti-lock brake system (ABS) and includes a traction control function. Whereas
the ABS prevented wheel lock up during braking, the traction control function controls
wheel slip during acceleration (longitudinal dynamics) and the ESP stabilizes the vehicle
about its vertical axis.

Sensors measure the position of the steering wheel, the pressure in the brake master
cylinder, the yaw velocity (yaw rate) and the acceleration transverse to the vehicle (lateral
acceleration). This makes it possible to compare the driver's intention with the momentary
vehicle behaviour so that in the event of the vehicle becoming unstable, ESP can initiate the
appropriate corrective action.

The ESP recognizes critical driving conditions, such as panic reactions in dangerous
situations, and stabilizes the vehicle, within the physical limits, by individually braking each
wheel and giving engine control intervention without need for the driver to actuate the
brake or the accelerator pedal.

Stability assist components

The ESP uses the same components as the ABS program with the addition of the following:

* Stability assist module: This is attached to the HCU and is fitted instead of the ABS
module. The stability assist module carries out the same function as the ABS module.

* Yaw rate sensor and accelerometer: This sensor cluster combines the yaw rate and the
lateral acceleration sensors in a single component. The sensor is attached the floor
crossmember.

* Steering wheel rotation sensor: This sensor measures the rotation of the steering wheel.

Item

1

2

3

Part Number

-

-

-

It is attached to the clockspring and is located on the steering column.

Anti-Lock Control - Stability Assist -
Stability Assist Module

S-MAX/Galaxy 2006.5 (02/2006-)

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Removal and Installation

Materials

General Equipment

Removal

Installation

Name

Specification

Spoiler Adhesive Kit 2 Component WSK-M5B401-A1 / 2U7J-M2G376-AA

Pneumatic vacuum gun
Worldwide Diagnostic System (WDS)

1. Remove the hydraulic control unit (HCU).

Refer to:

Hydraulic Control Unit (HCU)

(206-09A

Anti-Lock Control, Removal and Installation).

2.

3. Clean the HCU contact surface.

Material:

Spoiler Adhesive Kit 2 Component

(WSK-M5B401-A1 / 2U7J-M2G376-AA)

4. Remove all traces of the cleaner and foreign

material.

General Equipment:

Pneumatic vacuum gun

1.

WARNINGS:

Make sure that the module is correctly

located on the hydraulic control unit (HCU).

A new seal is required again once the

seal has touched the mating faces and the
component is then removed and installed
again.

CAUTIONS:

If accidentally dropped or knocked install

a new module.

Take extra care not to damage the seal.

NOTE: Make sure that the seal is correctly
located.

Torque:

0.5 Nm
1.0 Nm
1.5 Nm
2.0 Nm
2.5 Nm

Stage 1:
Stage 2:
Stage 3:
Stage 4:
Stage 5:

2. Install the HCU.

Refer to:

Hydraulic Control Unit (HCU)

(206-09A

Anti-Lock Control, Removal and Installation).

3. Configure the stability assist program.

General Equipment:

Worldwide Diagnostic

System (WDS)

4. Carry out the stability assist program Function

Test.

General Equipment:

Worldwide Diagnostic

System (WDS)

5. Carry out a road test.

Refer to:

Road/Roller Testing

(100-00 General

Information, Description and Operation).