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Diesel Engine Cruise Control Device (Discovery 3)

 
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Contents: Location of cruise control system…⇩ Cruise control system block diagram ⇩ Control switches ⇩

Location of cruise control system components


Location of cruise control system components


Item nameSpare part catalog numberDescription
1ECM (engine control module)
2Instrument panel
3Cruise control system switches
4APP sensor (accelerator pedal position)
5Brake light switch
6ABS control module (anti-lock braking system)
7-Electronic throttle
8-Transfer Case Control Module

Cruise control system block diagram


NOTE: A = Wired, D = CAN Bus (local area network of controllers)

NOTE: A = Wired, D = CAN Bus (local area network of controllers)


Item nameSpare part catalog numberDescription
1Transfer Case Control Module
2ECM (engine control module)
3Cruise control system switches
4Movable contact group
5APP (accelerator pedal position)
6Electronic throttle
7-Brake light switch
8-Diagnostic connector
9-Instrument panel
10-TCM (transmission control module)
11-ABS control module (anti-lock braking system)



The cruise control system is integrated with the engine management system and uses priority fuel delivery to automatically maintain a set vehicle speed. Once activated, the cruise control system can increase vehicle speed without using the accelerator pedal. The cruise control system includes the following components:
  • Pause/Resume Switch
  • Switch "+" ("set/acceleration") and "-" ("deceleration")
  • Movable contact group
  • Cruise control system indicator light (on the instrument panel)
The cruise control system also uses input signals from the brake light switch, APP sensor (accelerator pedal position), ECM (engine control module) and ABS control module (anti-lock braking system).

The driver controls the cruise control system using the steering wheel switches only. When the cruise control system is on, the ECM (engine control module) regulates PWM signals (pulse width modulation), transmitted to the fuel injectors to regulate the fuel supply as required to maintain a given speed.

Control switches


Control switches


Item nameSpare part catalog numberDescription
1-Pause/Resume Switch
2-Acceleration/Deceleration Switches (+/-)
3-Adaptive Cruise Control Time Break Switches (if any)
4-Movable contact group
5-Steering column wiper control switch



The cruise control switches are located on the LH (left) side of the steering wheel. The switches are connected via wires directly to the movable contact group. All cruise control switches are push-button rocker switches. The minimum set speed is 30 km/h. Cruise control is automatically suspended if the vehicle speed drops below 24 km/h.
The cruise control switches are resistive multi-link type switches. The cruise control system includes three switches, two of which are related to adaptive cruise control (if any). The switches change the resistance of the voltage signal sent to the ECM. (engine control module). A reference voltage of 5 V is supplied to the switches, which changes depending on the pressing of the switches.

Pause/Resume Switch


The Suspend/Resume switch controls the cruise control mode selection. When the ignition key is in position II, pressing the Suspend switch engages the Suspend mode, which temporarily disengages the cruise control system but retains the previously set speed in the ECM memory.

Resume switch


If the cruise control system has been suspended by pressing the suspend switch or pressing the brake pedal, pressing the resume switch restores the previously set speed.

Acceleration/Deceleration Switches (+/-)


If the cruise control system is enabled, pressing the " + " switch sets the current vehicle speed as the speed supported by the cruise control system. Each time the switch is pressed briefly, the set speed increases by 1 km/h. If the switch is held down, the driving speed increases continuously until the switch is released. Each time the "-" switch is briefly pressed, the set speed decreases by 1 km/h. If the switch is held down, the driving speed continuously decreases until the switch is released.


This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Article review: Saveliy Ushakov


 

Previous articles
Accelerator Pedal Specifications
The device and technical description of the accelerator 4.0L
The device and technical description of the accelerator 4.4L
The device and technical description of the accelerator 2.7L
Removal and installation the accelerator pedal
Cruise control device for gasoline engine

Current article
Diesel Engine Cruise Control Device

 
 

Similar articles from Land Rover repair manuals:
• Diesel Engine Control System — EDC Freelander 1 (1997-2006)
• Cruise control system switches Freelander 2 (2006-2014)
• TD V6 Diesel Engine Range Rover 3 (2001-2012)
• Code Engine Control Module (PCM) malfunctions Defender 2007+ (2007-2016)

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Discovery 3 
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Discovery 1 
  • General information
  • Technical specifications
  • Introduction to manual
  • Troubleshooting
  • Power unit
  • Diesel engine Tdi
  • Petrol engine V8i (3.9 l)
  • Petrol engine V8i (4.0 l)
  • Petrol engine Mpi
  • Reducing harmful emissions
  • Fuel system Tdi
  • Fuel system MFi
  • Fuel system SFi
  • Fuel system MPi (MEMS)
  • Cruise control
  • Cooling system (Tdi)
  • Cooling system (V8i)
  • Cooling system (MPi)
  • Exhaust system
  • Transmission
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  • Manual gearbox R380
  • Manual gearbox LT 77
  • Transfer case LT230T
  • Automatic gearbox
  • Cardan shaft
  • Rear axle
  • Front axle
  • Chassis
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  • Front suspension
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  • Brake system
  • Wheels and tires
  • Body and interior
  • Passive safety
  • Doors, locks and windows
  • Exterior body parts
  • Interior trim details
  • Seats
  • Electrical equipment
  • Heating and ventilation
  • Air conditioning
  • Windscreen wipers
  • Starting and charging system
  • Equipment and devices
  • Lighting and headlights


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