Land Rover Anti Lock Control Traction Control Rover Manual
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Air Dryer The air dryer is an integral part of the air supply unit. The air dryer contains a desiccant which absorbs moisture. Pressurised air is passed through the air dryer which removes any moisture in the compressed air before it is passed to the reservoir and/or the system When the air is exhausted from the system, the returning air is passed through the air dryer, regenerating the air dryer by removing moisture from the desiccant and expelling it to atmosphere via the exhaust. The air dryer is an essential component in the system ensuring that only dry air is present in the system. If moist air is present in the system, freezing can occur, resulting in poor system operation or component malfunction/failure. AIR RESERVOIR Front bracket1 Reservoir2 Air hose connection to reservoir valve block3 Rear bracket4 The reservoir is an air storage vessel which provides fast air suspension lift times by the immediate availability of pressurised air into the system. The reservoir is a steel fabrication and is located on the outside of the left hand chassis rail, in front of the air supply unit. The reservoir has a bracket at each end which attach to the body mounting brackets on the chassis. The rearward end of the reservoir has a Voss air fitting which provides for the connection of the air hose between the reservoir and the reservoir valve block. The reservoir has a capacity of 550 in3 (9 liters). The nominal working pressure of the reservoir is 243.6 lbf/in2 (16.8 bar gage), with a maximum pressure of 333.5 lbf/in2 (23 bar gage). Vehicle Dynamic SuspensionLesson 2 – Chassis 73Technical Training (G421053)
HEIGHT SENSORS Front Height Sensor Sensor body1 Drop link2 Lever arm3 Electrical connector4 Rear Height Sensor Drop link1 Electrical connector2 Sensor body3 Lever arm4 (G421053) Technical Training74 Lesson 2 – ChassisVehicle Dynamic Suspension
A height sensor is fitted in each corner of the vehicle to monitor the ride height of the vehicle. The sensor bodies are attached with screws to brackets on the chassis rails. Each sensor comprises a sensor body which contains a single track rotary potentiometer, a lever arm and a drop link. The sensor lever arm has a drop link which provides the connection between the sensor and the suspension control arm. The drop link is a serviceable component and is a push fit to the lever arm and the suspension control arm. The sensors are connected via their harness connector to the air suspension control module which receives the signal output from each sensor and, using preprogrammed information, converts the signal to a height for each sensor position. The front and rear sensors are handed and are coloured coded for identification as follows: •Right hand front and rear - black coloured lever •Left hand front and rear - white coloured lever. Calibration A calibration routine is performed using T4 to read the position of each corner of the vehicle and record the settings in the ECU memory. Once set, the calibration is not required to be performed unless the air suspension control module is removed or replaced, a height sensor is removed or replaced or a suspension arm to which the sensor is connected is removed or replaced. If the removed height sensor is subsequently refitted, the calibration procedure will have to be performed to ensure the integrity of the system. If a replacement drop link is fitted, recalibration is not required providing the sensor body is not removed from its mounting bracket. AIR SILENCER AND INLET AIR FILTER Exhaust (to atmosphere)1 Inlet and exhaust silencer2 Air inlet filter3 Exhaust air from air supply unit4 Air inlet supply to air supply unit5 Vehicle Dynamic SuspensionLesson 2 – Chassis 75Technical Training (G421053)
The air silencer is required to limit any noise produced from the air supply unit during inflation or deflation of the air springs. The silencer comprises two plastic moulded cans, which are bonded together with a silencing foam filling the large internal chamber which forms the exhaust silencer. A pipe connection is moulded onto each end of the silencer and provide for the attachment of the exhaust air to atmosphere pipe and the exhaust air pipe from the air supply unit. A secondary chamber, located around the outside of the exhaust chamber forms the silencer for the inlet air. Pipe connections are moulded onto each end of the intake silencer and provide for the attachment of the air inlet pipe from the inlet air filter and the air inlet pipe to the air supply unit. The intake air silencer is a hollow chamber with no noise reduction foam filling. The air intake filter is connected via a pipe to the intake silencer chamber of the air silencer unit. The filter is located in the rear left hand corner of the body, away from possible sources of dirt and moisture. The filter contains a foam element which removes particulate matter from the inlet air before it reaches the silencer or the air supply unit. AIR HARNESS Front axle valve block1Pipe - Front axle valve block to front RH air spring damper module 2 (G421053) Technical Training76 Lesson 2 – ChassisVehicle Dynamic Suspension
Front RH air spring damper module3 Front LH air spring damper module4 Pipe - Reservoir valve block to front axle valve block 5 Pipe - Reservoir valve block to reservoir6 Pipe - Exhaust7 Rear RH air spring damper module8 Pipe - Rear axle valve block to rear RH air spring damper module 9 Air silencer assembly10 Air inlet filter11 Pipe - Main inlet12 Rear LH air spring damper module13 Rear axle valve block14 Pipe - Reservoir valve block to rear axle valve block 15 Pipe - Compressor inlet16 Pipe - Compressor exhaust17 Air supply unit18 Pipe - Air supply unit to reservoir valve block19 Reservoir valve block20 Reservoir21 Pipe - Front axle valve block to front LH air spring damper module 22 The air harness comprises ten separate nylon pipes which are connected between the system components with Voss connectors. The pipes have the following diameters: DiameterPipe 6 mmHigh pressure pipes 8 mmCompressor inlet pipe 8 mmInlet filter to silencer 10 mmCompressor exhaust pipe 19 mmSilencer exhaust pipe If a pipe becomes damaged, an in-line connector is available for repair purposes. The pipes are secured to the body and the chassis with a number of plastic clips. Vehicle Dynamic SuspensionLesson 2 – Chassis 77Technical Training (G421053)
CONTROL DIAGRAM Fuse 26E (20A)1Fusible link 11E (30A)2 (G421053) Technical Training78 Lesson 2 – ChassisVehicle Dynamic Suspension
Ignition switch3 Fuse 35P (5A)4 Fusible link 10E (60A)5 Air supply unit relay6 Fuse 3E (5A)7 Air supply unit8 Compressor temperature sensor9 Motor10 Motor temperature sensor11 Exhaust valve solenoid12 Air suspension control module13 Central junction box14 Reservoir control valve15 Air suspension switch16 Front control valve17 Rear control valve18 RH rear height sensor19 LH rear height sensor20 RH front height sensor21 LH front height sensor22 Vehicle Dynamic SuspensionLesson 2 – Chassis 79Technical Training (G421053)
GENERAL A number of alloy wheel and tire size combinations are available. A Tire Pressure Monitoring System (TPMS) is also available. This system monitors the pressure in each tire and informs the driver if the pressure is outside predetermined thresholds. WHEELS 7JX17A 8JX18 - Style 1B 8JX18 - Style 2C 8JX19D 5.5JX19 - Space saverE There are a number of different alloy wheel styles as follows: •7J X 17 - one style •8J X 18 - two styles •8J X 19 - one style The spare wheel fitted to all vehicles is a steel space saver wheel. The wheel size is 5.5J X 19 and uses a T175/80R19 tire. The space saver wheel is a standard fitment for all markets except Gulf states. A full size spare is offered as an optional fitment. TIRES Tires are available in a number of sizes and tread patterns dependent on the vehicle usage. Tire sizes are as follows: •235/70R17 •255/60R18 •255/55R19. The following tires are available; All Season (AS), All Terrain (AT) and All Terrain - Sport (AT-S). (G421048) Technical Training34 Lesson 2 – ChassisWheels and Tires
NOTE: Tires should be inflated to the recommended pressures (as given in the owners handbook) only when the tires are cold (ambient temperature). If the tires have been subjected to use or exposed to direct sunlight, move the vehicle into a shaded position and allow the tires to cool before checking and/or adjusting the pressures. Tire Changing Care must be taken when removing and refitting tires to ensure that the tire pressure sensor is not damaged. Tire valve and pressure sensor1 Tire fitting/removal tool initial start position2 High tire and bead tension area3 Low tire and bead tension area4 When removing the tire, the bead breaker must not be used within 90 degrees of the tire valve in each direction. When using the tire removal machine, the fitting arm start position must be positioned as shown in the tire changing illustration. The wheel can then be rotated through 180 degrees in a counterclockwise direction. This will relieve the high tension from the tire bead allowing the remaining 180 degrees of the tire to be manually pulled from the rim. When refitting the tire, position the fitting arm as shown. Rotate the tire and take care that the bead on the low tension side of the tire does not damage the sensor. Tread Act - NAS Only Vehicles supplied to the North American markets must comply with the legislation of the Transport Recall Enhancement, Accountability and Documentation (TREAD) act. Part of the requirement of the TREAD act is for the vehicle to display a label, positioned on Wheels and TiresLesson 2 – Chassis 35Technical Training (G421048)
the drivers side B-pillar, which defines the recommended tire inflation pressure, load limits and maximum load of passengers and luggage weight the vehicle can safely carry. This label will be specific to each individual vehicle and will be installed on the production line. This label must not be removed from the vehicle. The label information will only define the specification of the vehicle as it came off the production line. It will not include dealer or owner fitted accessory wheels and tires of differing size from the original fitment. NOTE: If tires and wheels of a non-standard size are fitted to the vehicle, the car configuration file must be updated using T4. If the label is damaged or removed for body repair, it must be replaced with a new label specific to that vehicle. A new label is requested from Land Rover parts and will be printed specifically for the supplied VIN of the vehicle. (G421048) Technical Training36 Lesson 2 – ChassisWheels and Tires