Land Rover Discovery: Anti-lock Control - Traction Control / Description and Operation
COMPONENT LOCATION - SHEET1 OF 2
NOTE:
Right Hand Drive (RHD) illustration shown, Left Hand Drive (LHD)
illustration similar
- Rear right wheel speed sensor
- Rear left wheel speed sensor
- Front right wheel speed sensor
- Front left wheel speed sensor
- Integrated Anti-lock Brake System (ABS) control module and Hydraulic
Control
Unit (HCU)
COMPONENT LOCATION - SHEET 2 OF 2
NOTE:
Right Hand Drive (RHD) illustration shown, Left Hand Drive (LHD)
illustration similar
- Anti-lock Brake System (ABS) warning indicator
- Hill Descent Control (HDC) active indicator
- Brake amber warning indicator
- Brake red warning indicator
- Dynamic Stability Control (DSC) 'OFF' warning indicator
- DSC warning indicator
- Clockspring (CLKSPG)
- Brake pedal switch
- DSC switch
- HDC switch
- Restraints Control Module (RCM) - contains the yaw rate lateral
acceleration sensor
OVERVIEW
The anti-lock control - traction control system features an Anti-lock Brake
System (ABS) control module attached to a 4-channel Hydraulic Control Unit
(HCU). The integrated ABS control module and HCU is located in the rear
left side of the engine compartment, and is installed in the brake hydraulic
circuit between the brake master cylinder and the four brake calipers.
The ABS control module is connected to the High Speed (HS) Controller
Area Network (CAN) chassis bus, HS CAN powertrain bus, and actively
interacts with other vehicle system control modules and associated sensors
to receive and transmit current vehicle operating information.
When required, the ABS control module will actively intervene and operate
the HCU during braking or vehicle maneuvers to correct the vehicle
attitude, stability, traction or speed. During severe incidents of vehicle
correction, the ABS control module will also request the Engine Control
Module (ECM) to reduce engine power in order to further stabilize and
correct the vehicle.
To provide full system functionality, the anti-lock control and traction
control
system includes the following components:
- Dynamic Stability Control (DSC) switch.
- Hill Descent Control (HDC) switch.
- HDC / All Terrain Progress Control (ATPC) switch.
- Four wheel speed sensors.
- Yaw rate lateral acceleration sensor.
- Steering angle sensor.
- Instrument Cluster (IC) warning indicators.
- Integrated ABS control module and HCU.
The anti-lock control and traction control system also provides the following
brake functions that are designed to assist the vehicle or aid the driver:
- Anti-lock Brake 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).
- HDC, with gradient release control.
- ATPC, with gradient release control.
- Hill Start Assist (HSA).
- Yaw Stability Control (YSC).
- Terrain Response.
- Trailer brake control module.
- Intelligent Emergency Braking (IEB).
READ NEXT:
DESCRIPTION
The Dynamic Stability Control (DSC) switch is a non-latching switch installed
in the floor console, forward of the selector lever (for manual transmission
vehicles) or Transmission Contr
Retaining screw
Wheel speed sensor
Bearing seal and magnetic encoder ring
Wheel bearing
Wheel hub
An active wheel speed sensor is installed in each wheel knuckle, and
provides the Anti-lock B
The steering angle sensor is integrated into the clockspring.
The clockspring is mounted to the upper steering column with two screws,
and receives an electrical supply from the main harness via a
SEE MORE:
REMOVAL
CAUTION:
Use a suitable trim tool
NOTES:
When a new instrument cluster is to be installed, the Land Rover
approved diagnostic system must be connected to the vehicle and
the instrument cluster renewal procedure followed. This will allow
vehicle coding data and current service interval d
REMOVAL
NOTES:
Some variation in the illustrations may occur, but the essential
information is always correct.
Some components shown removed for clarity.
Removal steps in this procedure may contain installation details.
Refer to: Floor Console Upper Section (501-12 Instrument Panel
and Console