Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Anti-lock Control - Traction Control / Description and Operation

Land Rover Discovery (2009–2016) Service Manual / Chassis / Chassis-Brake-System / 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

Anti-lock control - traction control description and operation

  1. Rear right wheel speed sensor
  2. Rear left wheel speed sensor
  3. Front right wheel speed sensor
  4. Front left wheel speed sensor
  5. 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

COMPONENT LOCATION - SHEET 2 OF 2

  1. Anti-lock Brake System (ABS) warning indicator
  2. Hill Descent Control (HDC) active indicator
  3. Brake amber warning indicator
  4. Brake red warning indicator
  5. Dynamic Stability Control (DSC) 'OFF' warning indicator
  6. DSC warning indicator
  7. Clockspring (CLKSPG)
  8. Brake pedal switch
  9. DSC switch
  10. HDC switch
  11. 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).

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