length LAND ROVER DISCOVERY 1995 Owner's Manual

MFI
1
DESCRIPTION AND OPERATION DESCRIPTION
Hot Wire Multiport Fuel Injection
The 'Hot Wire' Multiport fuel injection system derives
its name from the mass air flow sensor which uses
one cold wire and one electrically heated wire to
measure the volume of air entering the engine.
The function of the system is to supply the exact
amount of fuel directly into the intake manifold
according to the prevailing engine operating
conditions.
To monitor these conditions, various sensors are fitted
to the engine to measure engine parameters. Data
from the sensors is received by the Engine control
module (ECM), the ECM will then determine the exact
amount of fuel required at any condition.
The ECM having received data from the sensors
produces pulses, the length of which will determine
the simultaneous open time of each bank of injectors
in turn, which will govern the amount of fuel injected.
Engine control module - ECM
The Multiport fuel injection system is controlled by the
14 CUX Engine Control Module comprising of a
microprocessor with integrated circuits and
components mounted on printed circuit boards. The
ECM is connected to the main harness by a 40 pin
plug.
Injectors
The eight fuel injectors are fitted between the
pressurized fuel rail and inlet manifold. Each injector
comprises a solenoid operated needle valve with a
movable plunger rigidly attached to the nozzle valve.
When the solenoid is energized the plunger is
attracted off its seat and allows pressurized fuel into
the intake manifold.Engine coolant temperature sensor
The engine coolant temperature sensor is located in
the front of the thermostat housing. The sensor
provides engine coolant information to the ECM. The
ECM increases the injector opening time when cold to
provide improved driveability, and reduces the
opening time as the engine reaches normal operating
temperature.
Engine fuel temperature sensor
The engine fuel temperature sensor is located in the
rail on the RH side of the ram housing. The sensor
sends fuel temperature data to the ECM, the ECM on
receiving the data will adjust the injector open time
accordingly to produce good hot starting in high
ambient temperatures.
Idle air control valve
The idle air control valve is screwed into a housing
attached to the rear of the plenum chamber, between
the plenum chamber and bulkhead. The idle air
control valve has two windings which enable the
motor to be energised in both directions thus opening
or closing the air valve as required by the ECM.
The idle air control valve will open and allow extra air
into the plenum chamber to maintain engine idle
speed when the engine is under increased (Electrical
and Mechanical) loads.
The idle air control valve will control engine idle speed
when the vehicle is stationary.
Heated oxygen sensors (0
2sensors) - Catalyst
vehicles
The two heated oxygen sensors are located forward
of the catalysts mounted in the exhaust downpipes.
The sensors monitor the oxygen content of the
exhaust gases and provide feedback information of
the air/fuel ratio to the ECM. Each sensor is heated by
an electrical element to improve its response time
when the ignition is switched on.

19FUEL SYSTEM
2
DESCRIPTION AND OPERATION Fuel pressure regulator
The fuel pressure regulator is mounted in the fuel rail
at the rear of the plenum chamber. The regulator is a
mechanical device controlled by plenum chamber
vacuum, it ensures that fuel rail pressure is
maintained at a constant pressure difference of 2.5
bar above that of the manifold.
When pressure exceeds the regulator setting excess
fuel is returned to the fuel tank.
Fuel pump
The electric fuel pump is located in the fuel tank, and
is a self priming 'wet' pump, the motor is immersed in
the fuel within the tank.
Air flow sensor
The hot-wire air flow sensor is mounted on a bracket
attached to the left hand valance, rigidly connected to
the air cleaner and by hose to the plenum chamber
inlet neck.
The air flow sensor consists of a cast alloy body
through which air flows. A proportion of this air flows
through a bypass in which two wire elements are
situated: one is a sensing wire and the other is a
compensating wire. Under the control of an electronic
module which is mounted on the air flow sensor body,
a small current is passed through the sensing wire to
produce a heating effect. The compensating wire is
also connected to the module but is not heated, but
reacts to the temperature of the air taken in, as engine
intake air passes over the wires a cooling effect takes
place.
The electronic module monitors the reaction of the
wires in proportion to the air stream and provides
output signals in proportion to the air mass flow rate
which are compatible with the requirements of the
ECM.Throttle position sensor
The throttle position sensor is mounted on the side of
the plenum chamber inlet neck and is directly coupled
to the throttle butterfly shaft.
The throttle position sensor is a resistive device
supplied with a voltage from the ECM. Movement of
the accelerator pedal causes the throttle valve to
open, thus rotating the wiper arm within the throttle
position sensor which in turn varies the resistance in
proportion to the valve position. The ECM lengthens
the injector open time when it detects a change in
output voltage (rising) from the throttle position
sensor.
In addition the ECM will weaken the mixture when it
detects the throttle position sensor output voltage is
decreasing under deceleration and will shorten the
length of time the injectors are open.
When the throttle is fully open, the ECM will detect the
corresponding throttle position sensor voltage and will
apply full load enrichment. This is a fixed percentage
and is independent of temperature. Full load
enrichment is also achieved by adjusting the length of
the injector open time.
When the throttle is closed, overrun fuel cut off or idle
speed control may be facilitated dependant on other
inputs to the ECM.
The throttle position sensor is 'self adaptive', which
means that adjustment is not possible. It also means
the throttle position sensor setting is not lost, for
example, when throttle stop wear occurs.
CAUTION: Do not attempt to adjust throttle
position sensor.

SFI
11
DESCRIPTION AND OPERATION ADD: 09/95 Fuel Filler Neck Assembly
The filler neck consists of a stainless steel upper
section and a convolute nylon lower section. The
nylon lower is joined at one end to the tank and at the
other to the stainless upper section where both joints
utilise a short piece of rubber hose. The joint at the
fuel tank is secured using a spring assisted hose clip
which has a shear off cap.
NOTE: The spring assisted clip must never
be re-used, if removed a new clip of the
same type must be fitted.
Tank vent connections are achieved using serviceable
plastic quickfit connectors. The filler cap is tethered to
the body of the vehicle. Only a cap of this type must
be used as a replacement.Fuel Lines
The fuel lines consist of two coated steel lines fitted
along the length of the chassis from the fuel pump at
the rear of the vehicle to the connections at the fuel
rail on the engine, via a fuel filter on the feed line.
Connections at the pump are metal quickfits, while
those at the filter and fuel rail are threaded unions
utilising "O" rings for effective sealing.
NOTE: When the fuel filter is serviced or
the fuel rail joints are disconnected, new
"O" rings must always be fitted.
Connections at the fuel rail are made using "Saginaw"
screw thread type connectors with "O" rings as the
sealing medium. The fuel lines in the engine
compartment are made from a braided nylon material.
NOTE: This material must not be clamped
or kinked as this impairs its performance.

STEERING
1
ADJUSTMENT POWER STEERING BOX
Service repair no - 57.10.13
WARNING: Adjustments of steering box
should not be required while in warranty
period. If box is stiff or tight and within
warranty, it must be returned to manufacturer. No
attempt must be made to introduce backlash.
1.Apply park brake, select 'P' in automatic
transmission and chock wheels. Support chassis
front on axle stands.
2.Remove engine undertray.
3.Disconnect drag link from steering drop arm.
4.Check torque to turn.
See Fault diagnosis,
Stiff Steering Checklist
5.Centralise steering box.See Centralise
Steering Box
NOTE: Only check for no backlash when
steering box is in central position.
NOTE: If steering wheel is not straight, it
should be repositioned.
See Repair,
Steering Wheel
The adjustment of the steering box ensures
any preload or end float present on centre is
removed.
6.The adjustment is obtained by rocking the drop
arm about centre whilst an assistant slowly
tightens the steering box adjuster screw.
7.Tighten the locknut when all backlash has been
removed.
8.Repeat the check for backlash. If backlash exists
loosen locknut and repeat adjustment
procedure.
9.Turn steering wheel lock to lock and check no
tightness exists.
10.Ensure front wheels are aligned and in straight
ahead position.
See Front Wheel Alignment
11.Adjust drag link 924 mm between ball joint
centres.
12.Connect drag link. Tighten to
40 Nm.
13.Lower vehicle to ground level and remove
chocks.
14.Road test vehicle.
See Fault diagnosis, Road
Test Procedure
NOTE: If steering wheel is not in straight
ahead position when vehicle is travelling
in a straight line, drag link length is
incorrect and is pushing drop arm away from
central position.
Drag link adjust
15.Right hand drive vehicles - if steering wheel is to
right, drag link is too long. If steering wheel is to
left drag link is too short.
Left hand drive vehicles - if steering wheel is to
right, drag link is too short. If steering wheel is to
left drag link is too long.
16.Adjust drag link until steering wheel points
straight ahead when vehicle is travelling in a
straight line.
CENTRALISE STEERING BOX
1.To centralise the box, insert a suitable peg (hole
size 8.06 mm) into the rear of the drop arm and
into the steering box casing to enable rapid and
accurate setting on centre.

STEERING
3
ADJUSTMENT FRONT WHEEL ALIGNMENT
Service repair no - 57.65.01
Checking Toe-out dimensions
NOTE: No Adjustment is provided for
castor, camber or swivel pin inclinations.
1.Set vehicle on level ground with road wheels
positioned straight ahead.
2.Push vehicle back and forwards to settle linkage.
3.Measure toe-out at horizontal centre-line of
wheels.
4.Check tightness of clamp bolt fixings. Tighten to
14 Nm.
Adjust
5.Loosen adjuster sleeve clamp.
6.Rotate adjuster to lengthen or shorten track rod.
7.Check toe-out setting as instructions 1 to 4.
When toe-out is correct, tap steering linkage ball
joint, in directions of arrows shown, to maximum
of their travel. This ensures full unrestricted
working travel.
8.Tighten clamp bolts to
14 Nm.
POWER STEERING PUMP DRIVE BELT
Service repair no - 57.20.01
Adjust
NOTE: For details of drive belt adjust
procedure
See ENGINE, Repair, Drive
Belt

57STEERING
18
REPAIR TRACK ROD AND LINKAGE
Service repair no - 57.55.09
Remove track rod
1.Site vehicle on a ramp [hoist].
2.Disconnect steering damper at track rod.
3.Disconnect track rod at ball joints, using
extractor LRT-57-018.
4.Remove track rod.
Remove linkage
5.Loosen clamp bolts.
6.Unscrew ball joints.
7.Unscrew track rod adjuster. (left hand thread).
Refit linkage
8.Fit replacement parts. Loosely fit clamp pinch
bolts.
9.Screw in ball joint to full extent of threads.
10.Set adjuster to track rod distance to 9mm as
shown.
11.Set adjuster end ball joint distance to 28.5mm as
shown.
12.Track rod effective length of 1230.0mm is
subject to adjustment during wheel alignment
check.
Refit track rod
CAUTION: Fit a new track rod if existing is
damaged or bent. No attempt should be
made to repair it.
13.Fit track rod and tighten ball joint nuts to
40 Nm.
14.Check front wheel alignment.See Adjustment,
Front Wheel Alignment
15.Connect steering damper to track rod.
16.Remove vehicle from hoist, or axle stands.

STEERING
19
REPAIR DRAG LINK AND DRAG LINK ENDS
Service repair no - 57.55.17
Remove drag link
1.Check front wheel alignment.
See Adjustment,
Front Wheel Alignment
2.Ensure wheels are positioned straight ahead
during following procedure.
3.Place vehicle on a hoist, or support front axle on
axle stands.
4.Remove right front road wheel.
5.Disconnect drag link ball joint at swivel housing
arm, using extractor LRT-57-018.
6.Disconnect drag link ball joint at drop arm using
LRT-57-018.
7.Remove drag link.
Remove drag link ends
8.Loosen clamp bolts.
9.Unscrew ball joints.
10.Clean internal threads in drag link.Refit drag link ends
11.Fit replacement ends. Loosely fit clamp bolts.
12.Set ball joints to drag link distance to 28.5mm as
shown.
13.Adjust ball pin centres to nominal length of
924.0mm. this length is adjusted during refit.
14.Centralise steering box.
See Adjustment,
Centralise Steering Box
15.Align steering wheel, if necessary.See
Steering Wheel
Refit drag link
CAUTION: Fit new drag link if existing drag
link is damaged or bent. No attempt
should be made to repair it.
16.Fit drag link. Tighten ball-joint nuts to
40 Nm.
17.Check steering lock stops.See Adjustment,
Steering Lock Stops
18.Ensure full steering travel is obtained between
lock stops. Adjust drag link length to suit.
19.Tap ball joints in direction shown, so both pins
are in same angular plane.
20.Tighten clamp bolts to
14 Nm.
21.Reverse removal procedure. 3 and 4.
22.Road test vehicle.
23.If driving straight ahead and steering wheel is
offset by 0°to±5°in either direction. Remedy by
adjusting drag link length.
WARNING: To correct steering wheel
deviations greater than±5°. Remove and
reposition steering wheel.
See Steering
Wheel

76CHASSIS AND BODY
6
REPAIR ADJUSTMENT-FRONT DOOR LOCK AND HANDLE
ASSEMBLY
Service repair no - 76.37.47
Inside door release handle to lock
1.Refit the inside door release handle surround
before any adjustment is made, allowing the
handle to be set from the correct operating
position.
2.At the lock end of the interior handle connecting
rod, rotate the spring tensioned nyloc nut
clockwise or counter-clockwise, as necessary to
shorten or extend the operating length of the rod.Outside door release handle to lock
3.Disconnect the connecting rod from the plastic
ferrule at the rear of the outer door release
handle. Rotate the rod clockwise or
counter-clockwise to shorten or extend the
operating length as necessary.
NOTE: Door release should be effective
before the total handle movement is
exhausted to provide a small overthrow
movement.

CHASSIS AND BODY
9
REPAIR REAR SIDE DOOR LOCK, INSIDE AND OUTSIDE
RELEASE HANDLES
Service repair no - 76.37.13/32
Remove
1.Ensure that the window is in the fully closed
position.
2.Disconnect battery negative lead.
3.Remove the interior trim panel from the door.
See rear side door - trim panel.
4.Remove the plastic vapour barrier sheet.
5.Disconnect the inside release handle control rod
by pulling it from its location in the door lock.
6.Disconnect the sill locking control rod from the
lock by releasing the metal clip.
7.Disconnect the outside release handle control
rod by pulling it out of the plastic ferrule.
8.Remove the two countersunk screws from the
door edge and the single screw and shakeproof
washer from the inner door panel. Retrieve any
spacing washers which may be fitted between
the inner door panel and lock.
9.Withdraw the lock through the upper rear
opening in the inner door panel.
NOTE: If necessary the following items
can be removed.10.Remove the two nuts, shakeproof washers and
retaining bracket securing the outer release
handle which are accessible through the upper
rear cut-out on the inner door panel.
11.Carefully detach the handle from the outer door
panel.
12.Remove the two screws and plain washers
securing the inside release handle to the inner
door panel and withdraw the handle complete
with connecting rod.
13.Disconnect the sill button connecting rod from
the bellcrank and withdraw the rod complete with
sill button.
Sill locking bellcrank
14.Using a small screwdriver, or length of 3.175 mm
(1/8 in) diameter rod, press the plastic locking
pins through the respective square inserts in the
inner door panel.
15.Release the bellcranks from the inner door panel
and unhook the respective connecting rods.
16.Withdraw the bellcranks from inside the door
panels.
NOTE: When refitting the bellcranks the
locking pins are entered into the square
insert from outside and pressed in flush.

76CHASSIS AND BODY
10
REPAIR ADJUSTMENT-REAR SIDE DOOR LOCK AND
HANDLE
Service repair no - 76.37.47
Outside door release handle to lock
1.Disconnect the short off-set connecting rod at
the rear of the outer release handle, rotate the
rod clockwise or counter clockwise to shorten or
extend the operating length of the rod as
required.
NOTE: Door release should occur before
the total handle movement is achieved to
provide a small overthrow movement.
REAR SIDE DOOR GLASS AND REGULATOR
Service repair no - 76.31.45
Remove
1.Ensure that the window is in the fully closed
position and secure it with adhesive tape over
the top of the door to prevent the glass from
dropping down.
2.Disconnect battery negative lead.
3.Remove the door trim panel.
See rear side
door - trim panel.
4.Remove the plastic vapour barrier.
5.Where applicable remove the door actuator and
window lift motor.
See ELECTRICAL, Repair,
window lift motor - rear. See ELECTRICAL,
Repair, rear side door actuator units.
6.Remove the four window regulator securing
screws and shakeproof washers from the inner
door panel.
7.Carefully disengage the lifting arm stud from the
glass lifting channel and remove the window
regulator from the lower opening in the inner
door panel.
8.Remove the waist rail seal from the top of the
door panel.
9.Remove the single bolt, spring and plain
washers from inside the door, securing the
bottom of the short glass run channel.
10.Remove the two bolts, spring and plain washers
from the hinge face of the door.