LAND ROVER DISCOVERY 1995 Workshop Manual

19FUEL SYSTEM
8
REPAIR Refit
17.Clean fuel rail, temperature sensor and pressure
regulator mating surfaces.
18.Fit fuel temperature sensor. Tighten to
7Nm
19.Clean injectors and injector recesses in fuel rail
and inlet manifold.
20.Fit new 'O' ring(s) to inlet end of injector(s).
21.Fit injector(s) to fuel rail, fit and secure clip(s).
22.Fit new 'O' rings to outlet ends of injectors.
23.Align injectors to inlet manifold and push fuel rail
into position.
24.Fit fuel rail securing bolts. Tighten to
10 Nm
25.Connect injector multiplugs.
26.Remove plugs from fuel feed hose and fuel rail.
27.Fit new 'O' ring to fuel feed hose.
28.Connect fuel feed hose to fuel rail.
29.Fit stiffening bracket.
30.Tighten stiffening bracket and feed hose bolts.
31.Fit pressure regulator.
32.Fit inlet manifold chamber.THROTTLE HOUSING
Service repair no - 19.22.45
Remove
1.Loosen clip, disconnect hose from throttle
housing.
2.Disconnect multiplug from stepper motor.
3.Disconnect multiplug from throttle potentiometer.
4.Disconnect breather hose from throttle housing.
5.Loosen 2 nuts securing throttle cable to
abutment bracket and release cable.
6.Release throttle cable from cam.
7.Remove 4 nuts securing throttle housing to
flexible mounting.
8.Release throttle housing from studs.

Mpi
9
REPAIR
Refit
9.Examine flexible mounting for splits or damage;
renew as necessary.
10.Thoroughly clean throttle housing and mating
face of flexible mounting.
11.Connect breather hose to throttle housing.
12.Position throttle housing to mounting studs, fit
nuts. Tighten to
7 Nm.
13.Connect throttle cable to cam.
14.Adjust throttle cable.
15.Connect multiplug to stepper motor.
16.Connect multiplug to throttle potentiometer.
17.Connect hose to throttle housing, tighten clip.FUEL PRESSURE REGULATOR
Service repair no - 19.45.06
Remove
1.Disconnect battery negative lead.
2.Position absorbant cloth around fuel pipe to fuel
rail union. Loosen bolt to relieve pressure.
Re-tighten bolt.
3.Release clip and disconnect fuel hose from
pressure regulator.
CAUTION: Plug the connectors.
4.Disconnect intake air temperature sensor
multiplug.
5.Remove 4 bolts securing pressure regulator
steady bracket to fuel rail and manifold, remove
steady bracket.
6.Disconnect vacuum hose from pressure
regulator.
7.Manoeuvre pressure regulator from fuel rail.
8.Discard 'O' ring.

19FUEL SYSTEM
10
REPAIR
Refit
9.Clean pressure regulator and mating surfaces.
10.Fit new 'O' ring to pressure regulator.
11.Fit vacuum hose to pressure regulator.
12.Position pressure regulator.
13.Fit steady bracket.
14.Fit bolts and tighten.
15.Connect multiplug to air temperature sensor.
16.Remove plugs, fit fuel hose to regulator and
secure with clip.
17.Reconnect battery negative lead.OXYGEN SENSOR
Service repair no - 18.30.41 - L.H
Service repair no - 18.30.42 - R.H
Remove
1.Disconnect oxygen sensor multiplug.
2.Release multiplug from bracket.
3.Release harness lead from cable tie.
4.Remove oxygen sensor; recover sealing washer.
Refit
5.Fit sealing washer to oxygen sensor.
6.Fit oxygen sensor. Tighten to
55 Nm.
7.Secure multiplug to bracket, connect multiplug.
8.Secure harness lead with cable tie.

Mpi
11
REPAIR AIR CLEANER
Service repair no - 19.10.01
Remove
1.Release clip and remove intake hose from air
cleaner.
2.Ease air cleaner assembly bottom mounting
rubbers from body.
3.Ease air cleaner from inner wing [fender]
mounting rubber
4.Remove air cleaner.
Do not carry out further dismantling if component
is removed for access only.
5.Release 4 clips securing top cover.
6.Raise top cover.
7.Remove air cleaner element.
Refit
8.Clean assembly body and top cover.
9.Fit air cleaner element.
10.Position top cover and secure with clips.
11.Position air cleaner assembly to body ensuring
front spigots locate securely in wing [fender]
mounting rubbers and bottom mounting rubbers
are located in the body.
12.Fit intake hose and secure with clip.

CRUISE CONTROL
1
DESCRIPTION AND OPERATION CRUISE CONTROL COMPONENT LOCATIONS -
Tdi AUTO EDC
COMPONENT LOCATION
1. Cruise control unit Under LH dash...................................................
2. Engagement (on/off) switch Dash panel....................................
3. Cruise control switch Steering wheel...............................................
4. Rotary coupler Steering wheel.........................................................
5. Vacuum pump Box section under jack.........................................................
6. Brake/vent switch Brake pedal....................................................
7. Vehicle speed sensor Transfer box behind transmission brake..............................................
8. Neutral lock-out relay Behind RH lower 'A' post trim casing..............................................
9. Actuator RH engine compartment...................................................................

19FUEL SYSTEM
2
DESCRIPTION AND OPERATION CRUISE CONTROL SYSTEM - V8i/Tdi AUTO EDC
Description
The cruise control system consists of
electro-mechanical devices, and comprises of the
following components.
ELECTRONIC CONTROL UNIT (ECU)
The microprocessor based ECU evaluates the signals
provided by the driver controls, brake pedal switch,
clutch pedal switch on manual models, and the
vehicle speed sensor. The ECU activates the vacuum
pump as required. The ECU also has a memory
function for set speed storage.
Driver operated switches
The main cruise control switch is located in the
auxiliary switch panel and activates the cruise control
system. The steering wheel switches provide
'set/accelerate' and 'resume/decelerate' features.
These switches provide the interface between driver
and cruise control system.
Brake pedal switch
The brake pedal switch is located under the lower
dash attached to the brake pedal mounting bracket.
The switch provides for fast disengagement of the
cruise control system and rapid return of the throttle
levers to the idle position when the brake pedal is
applied.
Clutch pedal switch
The clutch pedal switch is located under the lower
dash attached to the clutch pedal mounting bracket.
The switch provides for fast disengagement of the
cruise control system and rapid return of the throttle
levers to the idle position when the clutch pedal is
applied.Vehicle speed sensor
The vehicle speed sensor is located on the side of the
transfer box adjacent to park brake. The sensor
provides road speed data to the ECU. The cruise
control system cannot be engaged until the road
speed exceeds 45 km/h, (28 mph) the system will
automatically disengage at a road speed of 42 km/h
(26 mph).
Vacuum pump
The vacuum pump is energised when the main cruise
control switch is operated, and is actuated by the
steering wheel and brake pedal switches. The pump
provides a vacuum source to the cruise control
actuator. A control valve in the pump provides for
steady increase of road speed or purge of the system
when the brake pedal is applied.
Actuator
The actuator provides the servo mechanism link
between the cruise control system and throttle linkage
and is operated by vacuum from the vacuum pump.
Neutral lockout relay - automatic vehicles
The relay module is located in the right hand side
footwell, accessible by removing the trim casing.
The function of the relay module is to disengage the
cruise control system if neutral, or park, is selected in
the main gearbox, when the system is engaged.
Engine speed trip ECU - Manual vehicles
This unit is located in the right hand side footwell,
accessible by removing the trim casing.
The function of the unit is to disengage cruise control
if engine speed exceeds 5000 rev/min.

CRUISE CONTROL
1
FAULT DIAGNOSIS ROAD TEST
CAUTION: Do not engage cruise control
when vehicle is being used in low transfer
gear or reverse.
WARNING: The use of cruise control is not
recommended on winding, snow covered
or slippery roads or in heavy traffic
conditions where a constant speed cannot be
maintained.
1.Start engine, depress main control switch to
actuate cruise control system. Accelerate to
approximately 50 km/h, (30 mph), operate
'set/acc'switch, immediately release switch,
remove foot from accelerator pedal. Vehicle
should maintain speed at which'set/acc'switch
was operated.
2.Operate'set/acc'switch and hold at that
position, vehicle should accelerate smoothly until
switch is released. Vehicle should now maintain
new speed at which'set/acc'switch was
released.
3.Momentarily touch and release'set/acc'switch,
vehicle speed should increase 1.6 km/h (1 mph)
for each touch. Note that five touches will
increase speed 8 km/h (5 mph).
4.Apply'res/decel'switch while vehicle is in cruise
control mode, cruise control should disengage.
Slow to approximately 55 km/h, (35 mph)
operate'res/decel'switch, immediately release
switch and remove foot from accelerator, vehicle
should smoothly accelerate to previously set
speed. Increase speed using accelerator pedal,
release pedal, vehicle should return to previously
set speed.
NOTE: The cruise control system fitted to
the diesel engine is not as responsive as
that fitted to the petrol engine, due to the
characteristics of diesel engines. Therefore, at
speeds below approx. 65 km/h (40 mph), the
vehicle speed may drop when cruise is selected
and then slowly regain the 'set' speed.5.Operate brake pedal, cruise control system
should immediately disengage returning vehicle
to driver control at accelerator pedal. Operate
'res/decel'switch, vehicle should accelerate to
previously set speed without driver operation of
accelerator pedal.
6.Operate'res/decel'switch and allow vehicle to
decelerate to below 42 km/h, (26 mph). Operate
'res/decel'switch, cruise control system should
remain disengaged.
7.Operate'set/acc'switch below 40 km/h, (28
mph), cruise control system should remain
disengaged. Accelerate, using accelerator pedal
to above 45 km/h, (28 mph), operate'res/decel'
switch, and remove foot from accelerator pedal,
vehicle should smoothly adjust to previously
memorised speed.
8. Automatic vehicles- select neutral, system
should disengage.Manual vehicles- depress
clutch, system should disengage.
9.Cruise at 80 km/h (50 mph), declutch, select
neutral, remove foot from clutch. Operate
'res/decel'switch. Engine should rev to 5000
rev/min, cruise control disengages, engine
returns to idle.
10.Engage forward gear. Operate'res/decel'
switch. Remove foot from accelerator. Speed
should accelerate to previous set speed.
11.Depress main control switch in control system
should immediately disengage and erase
previously set speed from ECU memory.
See
Electrical Trouble Shooting Manual.
ELECTRICAL TESTS
Electrical functionality can be checked using
TestBook.
CABLE SETTING - TDi AUTOMATIC MODELS
1.An incorrectly adjusted kickdown cable can
prevent correct operation of the cruise control
system.
See AUTOMATIC GEARBOX,
Adjustment, kickdown cable adjustment.

CRUISE CONTROL
1
REPAIR BRAKE AND CLUTCH PEDAL SWITCHES/VENT
VALVES
Service repair no - 19.75.34 - Clutch Switch
Service repair no - 19.75.35 - Brake Switch
Remove
1.Remove 3 studs securing driver's side fascia
closing panel.
2.Release and move closing panel aside.
3.Locate and release locking sleeve.
4.Release switch/vent valve from pedal bracket.
5.Disconnect vacuum hose and harness connector
from switch.
6.Remove switch.
Refit
7.Reverse removal procedure.
NOTE: Ensure locking sleeve is correctly
positioned.

19FUEL SYSTEM
2
REPAIR ENGAGEMENT (ON/OFF) SWITCH
Service repair no - 19.75.30
Switch Replacement
Remove
1.Disconnect battery negative lead.
2.Carefully release auxiliary switch panel from
fascia.
3.Disconnect multiplug from switch.
4.Depress retaining lugs on switch, remove switch
from panel.
Bulb replacement
5.Position switch to facilitate removal of bulb.
6.Rotate bulb holder 90°and withdraw it from
switch.CRUISE CONTROL SWITCH
Service repair no - 19.75.36
Remove
1.Disconnect battery negative lead.
2. Models fitted with airbags:Remove driver's
airbag module.
See SUPPLEMENTARY
RESTRAINT SYSTEM, Repair, Driver's
Airbag Module
3. Models without airbags:Turn steering wheel
through 90°. Remove 2 Torx screws securing
pad to steering wheel and remove steering
wheel pad.
4.Disconnect cruise control switch multiplug from
main harness.

CRUISE CONTROL
3
REPAIR
5.Disconnect 2 Lucars from horn contacts.
6.Remove 2 screws securing cruise control switch
to steering wheel.
7.Remove 3 bolts securing mounting bracket to
steering wheel and remove mounting bracket.
8.Remove cruise control switch from steering
wheel.
Refit
9.Reverse removal procedure. Ensuring wiring
harness is routed correctly.
10. Models fitted with airbags:Refit driver's airbag
module and follow all safety precautions.
See
SUPPLEMENTARY RESTRAINT SYSTEM,
Repair, Driver's Airbag Module
ROTARY COUPLER
Service repair no - 19.75.54
The rotary coupler is located behind the steering
wheel. Access is gained by removing the steering
wheel and steering column shroud.
NOTE: On vehicles fitted with airbags.See
SUPPLEMENTARY RESTRAINT SYSTEM,
Repair, Rotary Coupler
Remove
1.Disconnect battery negative lead.
2.Remove steering wheel.
See STEERING,
Repair, Steering Wheel
3.Release 2 turnbuckles securing lower dash
closing panel and lower.
4.Remove 3 screws securing lower half of shroud
to steering column.
5.Disconnect rotary coupler multiplug from
steering column harness.