Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Clutch Pedal Position Sensor (Manual Ransmission Vehicles Only)

Clutch pedal position sensor (manual ransmission vehicles only)

The clutch pedal position sensor provides the ABS control module with a continuous measure of clutch pedal position.

The clutch pedal position sensor is attached to the clutch master cylinder.

The sensor is a permanent magnet linear contactless displacement type sensor.

The signal from the clutch pedal position sensor is transmitted on a hardwired connection to the Engine Control Module (ECM), which then transmits it to the ABS control module on the HS CAN powertrain systems bus.

To check the plausibility of the input from the sensor, the ABS control module uses the inputs from the bottom of travel switch in the clutch system.

For additional information, refer to: Clutch Controls (308-02 Clutch Controls - Vehicles With: M66 6-Speed Manual Transmission AWD, Description and Operation).

INTEGRATED ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE AND HYDRAULIC CONTROL UNIT (HCU)

INTEGRATED ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE AND HYDRAULIC CONTROL UNIT (HCU)

  1. Right rear brake
  2. Left front brake
  3. Right front brake
  4. Left rear brake
  5. Primary circuit inlet port
  6. Secondary circuit inlet port

The ABS control module controls the two EPB actuators separately. A longitudinal accelerometer sensor is integrated into the Restraints Control Module (RCM) which communicates with ABS control module on the HS CAN chassis systems bus. The longitudinal accelerometer in combination with the wheel speed sensors allows the ABS control module to determine the longitudinal attitude of the vehicle and to monitor vehicle deceleration.

Four hardwired connections with the EPB switch provide the ABS control module with park brake apply and release inputs. As the EBP is integrated into ABS control module, wheel speed sensors are also hard wired. Inputs from other components are received on the HS CAN, as follows:

  • Accelerator Pedal Position (APP) sensor, from the ECM
  • Stop lamp switch, from the ECM
  • Clutch pedal position sensor, from the ECM
  • Reverse gear switch, from the Central Junction Box (CJB) (manual transmission vehicles only)
  • Gear position, from the Transmission Control Module (TCM) (automatic transmission vehicles only)
  • 1st gear switch, from the ECM (manual transmission vehicles only)

In addition to the hardwired outputs to the EPB actuators, the ABS control module outputs status and fault signals on the HS CAN to operate the warning indicators and advise other systems if there is a fault with the EPB system.

Warning indicators

Warning indicators

  1. Park brake indicator (ROW and NAS variants shown)
  2. Brake warning indicator
  3. Message center

The ABS control module operates the park brake warning indicators using HS CAN powertrain messages to the IC. When the park brake is applied in the static mode, the park brake indicator is permanently illuminated red while the ignition is on, and for 30 seconds after the ignition is goes off. All faults are indicated by the brake warning indicators below the speedometer.

The brake warning indicator will flash red if the EPB is in an unknown position, for example if it was not possible to complete an actuation. All warning indications are accompanied by a related message displayed in the message center and a warning chime.

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