1999 LAND ROVER DISCOVERY tow

STEERING
DESCRIPTION AND OPERATION 57-15
As the pump rotor rotates towards the pump inlet the volume between the roller vanes and the pump housing
increases, this action causes a depression in the chamber between the pump roller vanes and the housing. As the
rotation continues the chamber is opened to the pump inlet, and the depression in the chamber causes fluid to be
drawn in. The roller vanes continue past the inlet port, closing off the inlet port and trapping the fluid in the chamber
between the rollers and the pump housing.
The internal 'cam' shape of the pump housing causes the rollers to move closer together as the pump rotor rotates
towards the outlet port. The reduced volume of the chamber between the roller vanes causes the fluid to become
pressurised. When the chamber is opened to the outlet port of the pump the fluid escapes at high pressure. The roller
vanes continue turning and go past the outlet port, closing off the chamber between the two roller vanes.
As rotation continues the inlet sequence begins again. The inlet and pressurisation/outlet sequences continue as the
pump rotates, and is repeated between each two roller vanes. The pump is a positive displacement type and the
potential pump output increases with engine (drive pulley) speed. The pressure relief and flow control valve regulates
flow/pressure by diverting fluid back to the pump inlet through internal recirculation passages in the pump body.
Steering damper
The steering damper is located behind and just below the first cross member of the chassis. The ends of the steering
damper have steel 'eyes' welded on, rubber bushes are installed in each 'eye'. The steering damper is attached
between brackets on the chassis rail and the drag link. Each end of the steering damper is secured by a bolt and
locknut. The hydraulic damper absorbs shocks in the steering, caused by road wheel deflections when operating on
rough terrain.

FRONT SUSPENSION
60-40 REPAIRS
Accelerometer - ACE - upper
$% 60.60.02
CAUTION: The accelerometer is an extremely
delicate component and can easily be rendered
unserviceable. Never use an accelerometer
which has been dropped or subjected to
mistreatment of any type.
Remove
1.Remove front stowage pocket.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Stowage pocket - front.
2.Disconnect multiplug from accelerometer.
3.Use LRT-60-014A to release clip and remove
accelerometer.
Refit
1.Using LRT-60-014A, fit accelerometer fully into
clip.
2.Connect accelerometer multiplug.
3.Fit front stowage pocket.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Stowage pocket - front.
4.If a replacement accelerometer has been fitted,
use TestBook to calibrate ACE system.
Accelerometer - ACE - lower
$% 60.60.03
CAUTION: The accelerometer is an extremely
delicate component and can easily be rendered
unserviceable. Never use an accelerometer
which has been dropped or subjected to
mistreatment of any type.
Remove
1.Raise vehicle on a ramp.
2.Disconnect multiplug from accelerometer.
3.Use LRT-60-014A to release clip and remove
accelerometer.
Refit
1.Use LRT-60-014A, fit accelerometer fully into
clip.
2.Connect accelerometer multiplug.
3.Lower vehicle.
4.If a replacement accelerometer has been fitted,
use TestBook to calibrate ACE system.

REAR SUSPENSION
64-12 DESCRIPTION AND OPERATION
Description - SLS
General
The Self Levelling Suspension (SLS) system is an optional fitment and comprises an Electronic Control Unit (ECU),
air supply unit, two air springs and two height sensors. The SLS system only operates on the rear suspension and is
designed to keep the vehicle level to compensate for uneven loads or when towing. The system controls the gap
between the chassis and the rear axle to a tolerance of ± 0.5 mm (0.02 in). The ride height of the rear of the vehicle
can be controlled in three modes of operation; normal ride height, Off-Road Mode (ORM) and extended mode. A
transportation mode, initiated using TestBook, is also available for moving the vehicle on a trailer.
The system is controlled electronically by an ECU which is shared with the ABS system and known as the Self
Levelling and Anti-Lock Braking System (SLABS) ECU. The system operates by using an air supply unit to inflate or
deflate the air springs to maintain a constant ride height.
An accessory remote handset is available to remotely operate the SLS system to allow easier connection and
disconnection of trailers.
Two SLS system warning lamps are located in the instrument pack. The warning lamp in the bottom left corner of the
instrument pack is the SLS warning lamp. If a fault is detected in the system, the warning lamp will illuminate
continuously in an amber colour. The warning lamp also flashes in an amber colour when the remote handset is being
used. The second warning lamp, located in the top right of the instrument pack is the ORM warning lamp. When ORM
is selected the warning lamp is continuously illuminated in an amber colour. When the SLS is between standard ride
height and ORM or in extended mode, the warning lamp will flash. Standard ride height, measured between the tip of
the axle bump stop rubber and the axle, is 61.5 mm (2.42 in). ORM ride height, measured between the tip of axle
bump stop and the axle, is 100 mm (3.93 in).
A switch is located in the group of six switches on the fascia and is used to select the ORM. The switch is non-latching
and must be depressed for a minimum of 0.5 seconds to signal the ECU that ORM has been requested.

BRAKES
70-38 REPAIRS
Brake pads - front
$% 70.40.02
WARNING: Brake pads must be renewed in axle
sets only, otherwise braking efficiency may be
impaired.
Remove
1.Raise front of vehicle.
WARNING: Do not work on or under a
vehicle supported only by a jack. Always
support the vehicle on safety stands.
2.Remove road wheel(s).
3.Remove lower guide pin bolt from caliper and
pivot caliper housing upwards.
4.Remove 2 brake pads from caliper carrier.
Shims are part of the brake pads.Refit
1.Rotate disc by hand and scrape all scale and
rust from around edge of disc.
2.Scrape rust from pad locating surfaces on
caliper.
3.Clean dust from calipers using brake cleaning
fluid.
WARNING: Do not use compressed air to
clean brake components. Dust from friction
materials can be harmful if inhaled.
4.Using tool LRT-70-500, press caliper pistons
fully into bores. Ensure that displaced fluid
does not overflow from reservoir.
5.Fit brake pads with chamfer towards leading
edge of disc.
6.Lower caliper housing over pads.
7.Ensure flats on guide pins locate with lugs on
caliper housing. fit new pivot bolt and tighten to
30 Nm (22 lbf.ft).
8.Fit road wheel(s) and tighten nuts to 140 Nm
(103 lbf.ft).
9.Remove stand(s) and lower vehicle.
10.Depress brake several times to set pad to disc
clearance.
11.Check and top-up brake fluid.

INTERIOR TRIM COMPONENTS
REPAIRS 76-3-21
11.Remove access panel from front edge of front
stowage pocket.
12.Remove screw securing front stowage pocket
to headlining.
13.Remove lens from front interior lamp.
14.Remove 2 nuts securing front interior lamp to
headlining.
15.Disconnect multiplug from front interior lamp.
16.Remove front interior lamp.
17.Remove 10 screws securing front stowage
pocket to headlining.
18.Disconnect 3 multiplugs from sunroof switches.
19.Remove front stowage pocket.
20.Remove caps from sun visor clips.
21.Remove screws and release both sun visor
clips.
22.Remove tail door aperture upper trim casing.
23.Remove rear sunroof aperture trim. 24.Remove front sunroof aperture trim.
25.Release end caps from all grab handles.
26.Remove 2 bolts securing each grab handle to
roof.
27.Remove all 4 grab handles.
28. Models with volumetric alarm: Release front
volumetric sensor from headlining and
disconnect multiplug.
29. Models with rear A/C:
aRelease rear A/C control panel from
headlining.
bDisconnect 2 multiplugs and 2 Lucar
connectors from rear A/C control panel.
cRemove rear A/C control panel.
30.Release rear interior lamp from headlining and
disconnect multiplug.
31.Remove rear interior lamp.

INTERIOR TRIM COMPONENTS
76-3-22 REPAIRS
32.Remove 2 clips securing rear of headlining to
roof.
33.Release rear sunroof switch from headlining.
34.Disconnect multiplug and remove rear sunroof
switch.
35.Remove screw securing headlining to roof.
36.With assistance, remove headlining.
37. Models with rear A/C:
aRemove foam pads from air vents.
bRelease 2 rear air vents from headlining.
cRelease 3 central air vents from headlining.
38.Remove 7 nuts securing each stowage pocket
to headlining and collect mounting plates.
39.Remove both pockets from headlining.
40.Remove 8 screws securing rear console to
headlining and collect 3 mounting plates.
41.Remove rear console from headlining.
Refit
1.Fit rear console and mounting plates to
headlining.
2.Fit and tighten nuts securing rear console to
headlining.
3.Fit both stowage pockets and mounting plates
to headlining.
4.Fit and tighten nuts securing stowage pockets
to headlining.
5. Models with rear A/C:
aFit 3 central air vents to headlining.
bFit 2 rear air vents to headlining.
cFit foam pads to air vents.
6.With assistance, position headlining in vehicle.
7.Fit and tighten screw securing centre of
headlining to roof.
8.Connect multiplug to rear sunroof switch.
9.Fit rear sunroof switch to rear console.
10.Fit clips securing rear edge of headlining to
sunroof.

INTERIOR TRIM COMPONENTS
REPAIRS 76-3-23
11.Position rear interior lamp to headlining and
connect multiplug.
12.Fit rear interior lamp to headlining.
13. Models with rear A/C:
aPosition rear A/C control panel to headlining
and connect multiplugs and Lucar
connectors.
bFit rear A/C control panel to headlining.
14. Models with volumetric alarm: Connect
multiplug to front volumetric sensor and fit
sensor to headlining.
15.Fit grab handles to headlining and secure with
bolts.
16.Fit end caps to grab handles.
17.Fit front sunroof aperture trim.
18.Fit rear sunroof aperture trim.
19.Fit tail door aperture upper trim casing.
20.Fit sun visor clips to headlining and secure with
screws.
21.Fit caps to sun visor clips.
22.Position front stowage pocket to headlining and
connect multiplugs to sunroof switches.
23.Fit and tighten 10 screws securing front
stowage pocket to headlining.
24.Connect multiplug to front interior lamp.
25.Fit front interior lamp to headlining and secure
with nuts.
26.Fit lens to front interior lamp.
27.Fit and tighten screw securing front stowage
pocket to headlining.
28.Fit access panel to front edge of front stowage
pocket.
29.Position sun visor to headlining and secure to
clip.
30.Connect multiplug to sun visor.
31.Fit and tighten screws securing sun visor to
headlining.
32.Repeat process for second sun visor.
33. Models with premium ICE: Position both 'A'
post trim casings and connect multiplugs to
speakers.
34.Fit both trim casings to 'A' posts and secure
with clips.
35.Fit both 'B' post upper trim casings.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Trim casing - upper - 'B' post.
36.Fit both 'D' post trim casings.

+ INTERIOR TRIM COMPONENTS,
REPAIRS, Trim casing - 'D' post.

INTERIOR TRIM COMPONENTS
76-3-24 REPAIRS
Stowage pocket - front
$% 76.67.26
Remove
1.Remove access panel from front edge of front
stowage pocket.
2.Remove screw securing front stowage pocket
to headlining.
3.Remove lense from front interior lamp.
4.Remove 2 nuts securing front interior lamp to
headlining.
5.Disconnect multiplug from front interior lamp.
6.Remove front interior lamp.
7.Remove 10 screws securing front stowage
pocket to headlining.
8.Disconnect 3 multiplugs from sunroof
switches.
9.Remove front stowage pocket. 10.Release clips securing sunroof switch pack.
11.Remove switch pack.
Refit
1.Fit sunroof switch pack to front stowage pocket
and secure with clips.
2.Position front stowage pocket to headlining
and connect multiplugs to sunroof switches.
3.Fit and tighten 10 screws securing front
stowage pocket to headlining.
4.Connect multiplug to front interior lamp.
5.Fit front interior lamp to headlining and secure
with nuts.
6.Fit lense to front interior lamp.
7.Fit and tighten screw securing front of front
stowage pocket to headlining.
8.Fit access panel to front stowage pocket.