Land Rover Anti Lock Control Traction Control Rover Manual

COMPONENT LOCATIONS - SHEET 1 OF 2
Hydraulic control unit with attached ABS module1
Stoplamp switch2
Right rear wheel speed sensor3
Left rear wheel speed sensor4
Anti-Lock Control - Traction ControlLesson 2 – Chassis
135Technical Training (G421079) 

Yaw rate and lateral acceleration sensor5
HDC relay (non-serviceable, integrated into
Central Junction Box (CJB))
6
Steering angle sensor7
Left front wheel speed sensor8
Right front wheel speed sensor9
(G421079) Technical Training136
Lesson 2 – ChassisAnti-Lock Control - Traction Control 

COMPONENT LOCATIONS - SHEET 2 OF 2
Brake warning indicator (NAS only)1
ABS warning indicator2
Brake warning indicator (all except NAS)3
DSC switch4
Anti-Lock Control - Traction ControlLesson 2 – Chassis
137Technical Training (G421079) 

HDC switch5
HDC warning indicator (low line instrument
cluster only)
6
HDC information indicator7
DSC warning indicator8
GENERAL
The anti-lock control - traction control system is based
on the 4 channel Bosch 8.0 system and provides the
following brake functions:
•Anti-lock Braking System (ABS).
•Corner Brake Control (CBC).
•Dynamic Stability Control (DSC).
•Electronic Brake-force Distribution (EBD).
•Electronic Traction Control (ETC).
•Emergency Brake Assist (EBA).
•Engine Drag-torque Control (EDC)....

Even if DSC is deselected, driving manoeuvres with
extreme yaw or lateral acceleration may trigger DSC
activity to assist vehicle stability.
HDC SWITCH
The HDC switch controls the selection of the HDC
function.
The HDC switch is a non-latching switch installed on
the center console, to the rear of the gear shift lever.
Pressing and releasing the HDC switch momentarily
connects an ignition power feed to the ABS module.
With the first press and release of the HDC switch, the
ABS module enables operation of...

Halfshaft3
Wheel speed sensor4
Screw5
An active wheel speed sensor is installed in each wheel
hub to provide the ABS module with a rotational speed
signal from each road wheel. The head of each wheel
speed sensor is positioned close to a 48 tooth sensor
ring on the outer diameter of the constant velocity joint
of the halfshaft. A flying lead connects each sensor to
the vehicle wiring.
The wheel speed sensors each have a power supply
connection and a signal connection with the ABS
module. When the...

STEERING ANGLE SENSOR
Gear wheel1
Electrical connector2
The steering angle sensor measures the steering wheel
angle and the rate of change of the steering wheel angle
(known as the steering wheel angle speed). These
measurements are output on the high speed CAN bus,
together with a quality factor signal, and used by the
ABS module for CBC and DSC operation.
The steering angle sensor is fixed to the pivot bracket
of the steering column by three screws. A gear wheel
in the steering angle sensor engages...

Steering Angle Sensor Harness Connector C0862 Pin Details
Input/OutputDescriptionPin No.
-Not used1 to 4
InputIgnition power supply5
Input/OutputHigh speed CAN bus high6
Input/OutputHigh speed CAN bus low7
-Ground8
WARNING INDICATORS
The following anti-lock control - traction control
indicators are installed in the instrument cluster:
ABS Warning Indicator
The ABS warning indicator is an amber colored
indicator located between the coolant temperature gage
and the fuel level gage.
The ABS warning...

continuously illuminated. If DSC has been selected off,
vehicles with the high line instrument cluster also
display a message, advising that DSC is switched off.
Operation of the DSC warning indicator is controlled
by a high speed CAN bus message from the ABS
module to the instrument cluster.
When the ignition switch is first turned to position II,
the DSC warning indicator illuminates for approximately
3 seconds as a bulb check. If a fault during the previous
ignition cycle caused the DSC warning...

Each of the circuits in the HCU contain the following
components to control the supply of hydraulic pressure
to the brakes:
•A normally open, solenoid operated, pilot valve, to
enable active braking.
•A normally closed, solenoid operated, priming valve,
to connect the brake fluid reservoir to the return
pump during active braking.
•A return pump, to generate hydraulic pressure for
active braking and return brake fluid to the reservoir.
•Normally open, solenoid operated, inlet valves and
normally closed,...