Ford Falcon. Manual - part 78

206-09-1 

Anti Lock Control 

206-09-1

SECTION : 206-09 Anti Lock Control

VEHICLE APPLICATION : 2003.0 BA Falcon
CONTENTS  

PAGE

DESCRIPTION AND OPERATION

  Anti Lock Control  ....................................................................................................................206-09-2

 Applicable 

Models 

 

................................................................................................................206-09-2

 General 

Description 

 

.............................................................................................................206-09-2

 Operation 

 

.............................................................................................................................206-09-4

 Operating 

Modes 

..................................................................................................................206-09-6

DIAGNOSIS AND TESTING

  Anti Lock Control  ..................................................................................................................206-09-14

  Principles of Operation  .......................................................................................................206-09-14

  Inspection and Verification  .................................................................................................206-09-14

  Diagnostic Trouble Code (DTC) Chart  ...............................................................................206-09-18

  Connector Circuit Reference  ..............................................................................................206-09-19

 Pinpoint 

Tests 

 

....................................................................................................................206-09-21

REMOVAL AND INSTALLATION

  Rear ABS sensor — IRS  .....................................................................................................206-09-27

  ABS Wheel Speed Sensor — Rear (Beam Axle)  ................................................................206-09-28

  Front ABS Wheel Sensors  ...................................................................................................206-09-29

  Rear Tone Wheel  .................................................................................................................206-09-29

  Front Tone Wheel  ................................................................................................................206-09-29

  ABS Modulator Assembly  ....................................................................................................206-09-29

206-09-2 

Anti Lock Control 

206-09-2

DESCRIPTION AND OPERATION

(ABS) or with the 4 channel Anti-lock Braking System

Anti Lock Control

with Traction Control (TCS).

Applicable Models

Throughout this section, the presence of [square

brackets] indicates that the information contained in

The material in this section applies both to vehicles

the brackets applies only to vehicles fitted with TCS

fitted with the 3 channel Anti-lock Braking System

(Traction Control).

General Description

ABS System Layout (3 Channel ABS)

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206-09-3 

Anti Lock Control 

206-09-3

DESCRIPTION AND OPERATION (Continued)

System Layout (4 Channel TCS)

The system is the Bosch ABS/TCS 5.3 system, and is system. The TCS system includes additional hydraulic

basically designed to be an add-on system to the

lines and components to provide traction control as an

existing master cylinder and booster assembly. The

additional feature.

system comprises of the following major components. The main difference is that the rear wheels are

hydraulic modulator / ECU assembly

controlled as a pair with the 3 channel system whilst

the 4 channel system controls them individually. The

wheel speed sensors

individual control of the rear (driven) wheels allows

hydraulic and electrical connectors

the system’s capabilities to be expanded to

[electrical communication with the EEC]

incorporate Traction Control.

The 3 channel Anti-lock Braking System and 4

channel Anti-lock Braking System with Traction

Control are quite similar in concept. Essentially, the

same wheel speed sensors and a similar

ECU/Hydraulic Modulator Assembly are used in each

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206-09-4 

Anti Lock Control 

206-09-4

DESCRIPTION AND OPERATION (Continued)

are switched to pressure hold, in order to prevent a

Anti-lock Braking (ABS and TCS)

further increase in pressure at the rear brakes, thus

Anti-lock braking systems are a significant safety

electronically reproducing a pressure-proportioning

feature designed to prevent wheel “lock-up” during

function at the rear brakes.

hard brake applications. This results in improved

vehicle stability, steerability and usually, shorter

Operation

stopping distances.

Anti-lock Braking (ABS and TCS)

The ABS system uses wheel sensors to detect the

approaching lock-up of a wheel. When detected, the

The rotational speed of each wheel is determined by

system will automatically control the fluid pressure in

inductive wheel speed sensors. When the brakes are

the corresponding brake circuit. The pressure is firstly applied, the change in rotational speed is used by the

maintained (pressure hold) or if the tendency to lock is processor in the ABS - ECU to determine the

still present, reduced. As the wheel is re-accelerated

deceleration, acceleration and the slip of the wheels.

the fluid pressure is increased, thus systematically

The front wheels are individually controlled with the

slowing the vehicle.

rear wheels being controlled together. If one side of

The increase/hold/decrease of fluid pressure will

the road surface is slippery, the rear wheel braking on

continue to occur until either the road surface

this surface determines the braking pressure of both

changes, the brake pedal is released or brake pedal

rear wheels. While this may cause slightly reduced

force reduced, or the vehicle stops.

rear braking, it substantially increases rear end

stability.

Traction Control (TCS only)

 WARNING: Despite this improvement to the

Traction Control, or Automatic Spin Reduction

braking system, you should continue to exercise

systems are a significant safety feature designed to

caution in all hazardous driving situations,

prevent wheel spin during acceleration. This results in

especially when driving on extreme road surfaces.

improved vehicle stability and steerability. If wheel

The ABS system will assist in improved vehicle

spin is desired (this may be so in some sandy

stability and steerability under severe braking,

conditions to avoid becoming bogged) the driver can

usually reducing the braking distance, but may

disable the traction control by pressing the button on

not prevent an accident from occurring.

the dash. The traction control can be enabled again

by pressing the same switch again or by cycling the

Traction Control (TCS only)

ignition.

The addition of a priming valve and a switching valve

The TCS uses wheel speed sensors to detect the

allow the brake pressure at the rear wheels to be

spinning of one, or both, of the drive wheels. When

applied independently of each other and of the driver.

detected the system will automatically apply brake

pressure to the spinning wheel(s), and will reduce

The rotational speed of each wheel is determined by

engine torque. The brake pressure in the spinning

inductive wheel speed sensors. Any change in

wheel(s) is built up in small steps, so as not to

rotational speed is used by the processor in the TCS

over-brake the wheel(s), and will equalise the

ECU to determine the deceleration, acceleration, and

available torque between the two drive wheels

the slip of the wheels.

according to the surfaces the wheels are on. The

If one side of the road surface is slippery and the

engine torque is reduced via the engine management wheel on that surface spins, that rear wheel is

system (EEC). The EEC will cut fuel injection and

controlled by brake pressure being applied, with

ignition to one or more cylinders depending on how

perhaps some engine power reduction. If both wheels

much torque reduction is required.

are on a slippery surface and spin, the wheels may be

The brake and engine intervention will continue to

slightly braked but most of the control is through

occur until the wheel(s) are no longer spinning.

reduction of engine power.

During traction control operation the traction control

Use of brake intervention is limited when the vehicle

warning lamp will flash to inform the driver that the

speed is above 40km/h to prevent excessive brake

vehicle is under traction control. This continues until

temperatures being generated at the rear wheels.

traction control is finished.

 WARNING: Despite this improvement to the

Electronic Brake-Force Distribution (EBD)

power-train system, drivers should continue to

exercise caution in all hazardous driving

Electronic Brake-Force Distribution (EBD) is a system

situations, especially when driving on extreme

where by the amount of master cylinder Brake-Force

road surfaces. The TCS will assist in improved

pressure applied to the rear wheels is controlled

vehicle stability and steerability during severe

electronically as opposed to mechanically.

acceleration, usually improving the vehicle

EBD ensures that the rear wheels are sensitively

acceleration, but may not prevent loss of vehicle

monitored for slip with respect to the front wheels. If

control from occurring.

slip is detected, the inlet valves for the rear wheels

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