Land Rover Anti Lock Control Traction Control Rover Manual
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49CONTROL DIAGRAM.................................................................................................................................................. 51Vehicle Dynamic Suspension..................................................................................................................... 52GENERAL...................................................................................................................................................................... 54OPERATING MODES................................................................................................................................................... 56SPECIAL MODES......................................................................................................................................................... 58AIR SUSPENSION CONTROL MODULE................................................................................................................... 65AIR SUSPENSION SWITCH........................................................................................................................................ 66FRONT AND REAR AXLE VALVE BLOCKS........................................................................................................... 67RESERVOIR VALVE BLOCK..................................................................................................................................... 69AIR SUPPLY UNIT....................................................................................................................................................... 73AIR RESERVOIR........................................................................................................................................................... 74HEIGHT SENSORS....................................................................................................................................................... 75AIR SILENCER AND INLET AIR FILTER................................................................................................................. 76AIR HARNESS............................................................................................................................................................... 78CONTROL DIAGRAM.................................................................................................................................................. 80Ride and Handling Optimization.............................................................................................................. 81GENERAL...................................................................................................................................................................... 82TERRAIN RESPONSE ROTARY CONTROL AND MODULE................................................................................. 83TERRAIN RESPONSE OPERATION........................................................................................................................... 86DIAGNOSTICS.............................................................................................................................................................. 88Rear Drive Axle and Differential.............................................................................................................. 88GENERAL...................................................................................................................................................................... 90OPEN REAR DIFFERENTIAL ASSEMBLY............................................................................................................... 93SERVICE........................................................................................................................................................................ 94ELECTRONIC REAR DIFFERENTIAL ASSEMBLY................................................................................................. 101TERRAIN RESPONSE™.............................................................................................................................................. Technical Training4 Table of Contents
102SERVICE........................................................................................................................................................................ 102DIAGNOSTICS.............................................................................................................................................................. 103ELECTRONIC REAR DIFFERENTIAL CONTROL DIAGRAM............................................................................... 104Parking Brake............................................................................................................................................. 105GENERAL...................................................................................................................................................................... 105PARKING BRAKE SWITCH........................................................................................................................................ 106DRUM BRAKES............................................................................................................................................................ 108BRAKE CABLES........................................................................................................................................................... 110EMERGENCY RELEASE CABLE............................................................................................................................... 111CLUTCH PEDAL POSITION SENSOR (MANUAL TRANSMISSION MODELS ONLY)...................................... 112PARKING BRAKE INDICATORS............................................................................................................................... 112Amber Parking Brake Warning Indicator.............................................................................................................................................. 112Red Parking Brake Warning Indicator................................................................................................................................................... 112PARKING BRAKE MODULE...................................................................................................................................... 115PARKING BRAKE OPERATION................................................................................................................................. 118DAR Pre-arming.................................................................................................................................................................................... 120PARKING BRAKE CONTROL DIAGRAM................................................................................................................ 122Hydraulic Brake Actuation....................................................................................................................... 123GENERAL...................................................................................................................................................................... 123BRAKE PEDAL............................................................................................................................................................. 124BRAKE MASTER CYLINDER AND RESERVOIR.................................................................................................... 127BRAKE PIPES AND HOSES........................................................................................................................................ 128Brake Booster.............................................................................................................................................. 131GENERAL...................................................................................................................................................................... 131VACUUM PIPES........................................................................................................................................................... 131BRAKE BOOSTER........................................................................................................................................................ Table of Contents 5Technical Training
132VACUUM PUMP (4.0L AND 4.4L).............................................................................................................................. 133VACUUM PUMP (2.7L DIESEL)................................................................................................................................. 134VACUUM PUMP CONTROL DIAGRAM (4.0L AND 4.4L)...................................................................................... 135Anti-Lock Control - Traction Control...................................................................................................... 138GENERAL...................................................................................................................................................................... 138DSC SWITCH................................................................................................................................................................. 139HDC SWITCH................................................................................................................................................................ 139HDC RELAY.................................................................................................................................................................. 139STOPLAMP SWITCH................................................................................................................................................... 139WHEEL SPEED SENSORS........................................................................................................................................... 140YAW RATE AND LATERAL ACCELERATION SENSOR....................................................................................... 141STEERING ANGLE SENSOR...................................................................................................................................... 142WARNING INDICATORS............................................................................................................................................ 143HCU................................................................................................................................................................................ 146ABS MODULE............................................................................................................................................................... 148SYSTEM OPERATION................................................................................................................................................. 153ANTI-LOCK CONTROL DIAGRAM........................................................................................................................... 155Test questions.............................................................................................................................................. Technical Training6 Table of Contents
Front Suspension Component Layout NOTE: Air suspension version shown Flanged bolt (Upper control arm forward bush)1Bush - forward (Upper control arm)2 Front SuspensionLesson 2 – Chassis 11Technical Training (G421043)
Nut (Upper control arm forward bush)3 Flanged bolt (Upper control arm forward bush)4 Bush - rearward (Upper control arm)5 Nut (Upper control arm rearward bush)6 Nut (Anti-roll bar link to upper control arm)7 Upper control arm8 Ball joint (Upper control arm to swivel hub)9 Nut (Ball joint to swivel hub attachment)10 Nut (Lower control arm rearward bush)11 Flat washer12 Cam washer (Lower control arm rearward bush)13 Bush - rearward (lower control arm)14 Wheel knuckle15 Wheel hub and bearing assembly16 Steering rack attachment17 Wheel hub bolt (4 off)18 Nut (Damper assembly lower attachment)19 Ball joint (Lower control arm to swivel hub)20 Nut (Ball joint to swivel hub attachment)21 Lower control arm22 Bolt (Damper assembly lower attachment)23 Nut (Lower control arm forward bush)24 Flat washer25 Cam washer (Lower control arm forward bush)26 Lower control arm forward bush27 Bolt (Lower control arm forward bush)28 Bolt (Lower control arm rearward bush)29 Anti-roll bar link30 Anti-roll bar31 Anti-roll bar bush32 Nut (anti-roll bar bracket)33 Anti-roll bar bracket34 Nut (anti-roll bar link to anti-roll bar)35 Damper assembly (air)36 Damper assembly (coil spring)37 GENERAL The front suspension is a fully independent design which offers a reduction in unsprung weight over the beam axle design fitted to previous Land Rover models. The front suspension comprises an upper control arm, a lower control arm, a wheel knuckle and hub, an anti-roll bar and links assembly and a damper assembly. The damper can have a coil spring or air spring, both damper types use a similar design. The suspension components are common to both coil and air spring versions. The suspension control arms have been designed for maximum ground clearance and also allow for adjustment of the camber and castor using cam adjusters. (G421043) Technical Training12 Lesson 2 – ChassisFront Suspension
DAMPER MODULE - AIR SUSPENSION Rebound washer*1 O-ring - damper rod (2 off)*2 Self-locking nut*3 Spacer - damper rod*4 Bump washer5 Spring aid*6 O-ring - air spring sleeve support (2 off)*7 Damper assembly*8 Voss air fitting9 Damper rod10 Self-locking nut (3 off)11 Top mount12 Bush13 Retaining pin - air spring assembly*14 Air spring assembly*15 NOTE: * shows service items The damper module comprises an air spring assembly, top mount and a damper assembly. The damper and air spring are only serviceable as complete assemblies. Damper The damper assembly is a twin tube design with the conventional coil spring replaced by the air spring. The lower end of the damper is fitted with a bush and is attached to the lower control arm with a bolt and nut. Front SuspensionLesson 2 – Chassis 13Technical Training (G421043)
The damper functions by restricting the flow of hydraulic fluid through internal galleries within the damper. The damper rod moves axially within the damper, its movement limited by the flow of fluid through the galleries, providing damping of undulations in the terrain. The damper rod is sealed at its exit point from the damper body to maintain the fluid within the unit and to prevent the ingress of dirt and moisture. The seal also incorporates a wiper to keep the rod clean. Air Spring The air spring comprises an aluminium restraining cylinder, top mount, spring aid, air sleeve and an inner support sleeve. The air sleeve is made from a flexible rubber material which allows the sleeve to roll up and down the air spring piston as the vehicle changes height. The air sleeve is attached to the restraining cylinder and support sleeve by crimp rings which provide an air tight seal. The support sleeve contains a seal carrier which has two O-rings sealing the support sleeve and two O-rings sealing to the damper body. The top of the air sleeve is crimped to the top mount which attaches to the body inner wing with 3 integral studs and self-locking nuts. A spring aid is fitted to the damper rod and prevents the top mount contacting the top of the damper during full suspension compression and assists the suspension tune. The lower end of the air spring is located over the damper body and seats on a fabricated seat on the damper body. The air sleeve is positively attached to the seat with a retaining pin. The damper rod is located through a central hole in the top mount. The rod is threaded at its outer end. A self-locking nut secures the air spring to the damper rod. The top mount is an integral part of the air spring and is fitted with a bush and rebound washer which are located between the top mount plate and the damper rod. The top mount is secured to the damper rod with a self-locking nut. The top mount attaches to a housing on the chassis with 3 integral studs and self-locking nuts. The top mount also incorporates a 6 mm Voss air fitting which allows for the attachment of the air harness. A gaitor is available as a dealer fit component. The gaitor is similar to the one fitted to the rear air damper module and is available if a customer experiences dirt and debris becoming trapped between the air sleeve and the restraining cylinder under certain terrain conditions. (G421043) Technical Training14 Lesson 2 – ChassisFront Suspension
DAMPER MODULE - COIL SPRING SUSPENSION Self locking nut1 Rebound washer2 Top mount assembly3 Spring spacer (selective)4 Spring isolator5 Bump washer6 Spring aid7 Dust tube8 Bump cup9 Coil spring10 Damper11 Damper rod12 Self locking nut (3 off)13 Bush14 The coil spring damper module comprises a damper, coil spring and top mount.Damper The damper assembly is a twin tube design with the conventional coil spring located on a welded spring seat on the damper tube. The lower end of the damper is fitted with a bush and is attached to the lower control arm with a bolt and nut. Front SuspensionLesson 2 – Chassis 15Technical Training (G421043)
The damper functions by restricting the flow of hydraulic fluid through internal galleries within the damper. The damper rod moves axially within the damper, its movement limited by the flow of fluid through the galleries, providing damping of undulations in the terrain. The damper rod is sealed at its exit point from the damper body to maintain the fluid within the unit and to prevent the ingress of dirt and moisture. The seal also incorporates a wiper to keep the rod clean. The damper rod is located through a central hole in the top mount. The rod is threaded at its outer end. A self-locking nut secures the top mount to the damper rod. A spring aid is fitted to the damper rod and prevents the top mount contacting the top of the damper during full suspension compression and also assists the suspension tune. Spring and Top Mount The coil spring fitted differs with vehicle specification. Each spring is colour coded to identify its rating and fitment requirements. The coil spring is located in a spring seat which is an integral part of the damper body. The design of the spring seat prevents the spring rotating. The opposite end of the coil spring is located in a spring isolator which is fitted in the top mount. The spring isolator is made from rubber and prevents any noise produced during damper and spring compression/extension from being transmitted to the vehicle body. The top mount is fitted with a bush and rebound washer which are located between the top mount plate and the damper rod, a self locking nut secures the damper rod to the top mount. The top mount attaches to a housing on the chassis with 3 integral studs and self-locking nuts. The spring is fitted with spring spacers which are located between the spring isolator and the top mount. The spring spacers control the length of the spring to maintain the correct trim height. The spring spacers are colour coded and are supplied with a replacement spring. (G421043) Technical Training16 Lesson 2 – ChassisFront Suspension
ANTI-ROLL BAR Nut - link to anti-roll bar (2 off)1 Link (2 off)2 Nut - link to upper control arm (2 off)3 RH upper control arm4 Nut (4 off)5 Bracket (2 off)6 Bush (2 off)7 LH upper control arm8 Anti-roll bar9 Front SuspensionLesson 2 – Chassis 17Technical Training (G421043)