1995 LAND ROVER DISCOVERY service

Tdi
17
REPAIR VEHICLE SPEED SENSOR
Service repair no - 18.30.22
Remove
NOTE: The following procedure is carried
out with the ramp still raised.
1.Disconnect battery negative lead.
2.Disconnect sensor multi-plug.
3.Remove sensor retaining screw.
4.Remove sensor retaining plate.
5.Remove sensor from transfer box.
Refit
6.Reverse removal procedure.CLUTCH PEDAL SWITCH
Service repair no - 18.30.67
Remove
1.Disconnect battery negative lead.
2.Disconnect switch wiring lucars.
3.Turn rear body of switch to release locknut
4.Remove locknut.
5.Remove switch from mounting bracket.
Refit
6.Reverse removal procedure.

19FUEL SYSTEM
18
REPAIR BRAKE PEDAL SWITCH
Service repair no - 18.30.66
Remove
1.Disconnect battery negative lead.
2.Disconnect switch wiring Lucars.
3.Loosen rear locknut.
4.Remove front locknut.
5.Remove switch from mounting bracket.
Refit
6.Reverse removal procedure.COOLANT TEMPERATURE SENSOR
Service repair no - 18.30.68
Remove
1.Disconnect battery negative lead.2.Disconnect sensor multi-plug.
3.Remove sensor.
4.Clean off water spillage from sensor area.
Refit
5.Fit a new copper washer.
6.Fit sensor and tighten securely.
7.Refill cooling system.
8.Run engine, check for water leaks around
sensor.

Tdi
19
REPAIR THROTTLE POSITION SENSOR
Service repair no - 18.30.17
NOTE: The throttle position sensor is not a
serviceable item, in the event of failure it
must be renewed.
Remove
1.Disconnect battery negative lead.
2.Disconnect multiplug from sensor.
3.Remove nut securing throttle pedal quadrant to
sensor. Remove throttle pedal quadrant.
4.Remove two screws securing sensor to pedal
box.
5.Remove sensor.
Refit
6.Reverse removal procedure.
CAUTION: DO NOT operate throttle
mechanism while sensor is loosely fitted,
damage may be caused to sensor wiper
track.ELECTRO-PNEUMATIC MODULATOR
Service repair no - 18.30.69
Remove
1.Disconnect battery negative lead.
2.Disconnect multi-plug from modulator.
3.Remove three vacuum pipes from modulator.
4.Remove nut securing modulator to inner wing.
5.Remove modulator.
Refit
6.Reverse removal procedure.

MFI
3
DESCRIPTION AND OPERATION Tune select resistor -
To suit individual market requirements a tune select
resistor is connected across pins 5 and 27 of the
ECM.
It is located adjacent to the ECM, and strapped to the
MFI cable assembly. The value of the resistor is
dependent on the market application:
Red wire, 180 ohms, Australia, Rest of world.
Green wire, 470 Ohms, UK and Europe - non catalyst.
Yellow wire 910 Ohms, Saudi non catalyst.
White wire, 3K9 Ohms, European catalyst
Condenser fans
It should be noted that under high coolant
temperatures, when the engine is switched off, the
condenser fans will be activated and will run for
approximately ten minutes.Vehicle speed sensor
The vehicle speed sensor is located on the side of the
Transfer box adjacent to the parking brake. The
sensor provides road speed data to the ECM. The
ECM in turn detects vehicle movement from the road
speed input and ensures that idle air control mode is
disengaged. Should the vehicle speed sensor fail in
service the ECM idle air control would become erratic.
The sensor also provides road speed data to the
electric speedometer and cruise control ECU.
Inertia fuel shutoff switch
The inertia fuel shutoff switch is a mechanically
operated switch, located on the bulkhead adjacent to
the washer reservoir under bonnet [hood].
The switch is normally closed and is in line with the
fuel pump. In the event of a sudden impact the switch
opens, and disconnects the electrical feed to the fuel
pump. The switch is reset by pressing down the
button.
WARNING: Check the integrity of the fuel
system before the inertia switch is reset.
Relay modules
The two multiport fuel injection relays are located in
the RH footwell area behind the 'A' post panel. The
main relay module is energized via the ECM when the
ignition is switched on and supplies current to the
multiport fuel injection system. The fuel pump relay
module is energized by the ECM which in turn
operates the fuel pump to pressurize the fuel system.

MFI
7
DESCRIPTION AND OPERATION MICRO PROCESSOR POWER CHECK
(Instrument binnacle - Service use only)
As part of the engine starting procedure, this symbol
will illuminate momentarily.
FUEL INJECTION SYSTEM
CAUTION: The fuel system incorporates
fine metering components that would be
affected by any dirt in the system;
therefore it is essential that working conditions
are scrupulously clean. If it is necessary to
disconnect any part of the fuel injection system,
the system MUST be depressurized. All openings
left open after the removal of any component from
the fuel system, MUST be sealed off to prevent
ingress of dirt.ENGINE SETTING PROCEDURE
If a major overhaul has been undertaken of the fuel
injection/engine system, the following check and
adjustments must be carried out before attempting to
start the engine.
1.Spark plug gaps.
See ENGINE TUNING DATA,
Information, Engine 3.9 V8i
2.Ignition timing.See ELECTRICAL,
Adjustment, Ignition Timing
CAUTION: Catalyst vehicle - if the engine
is misfiring, it should be immediately shut
down and the cause rectified. Failure to do
so will result in irreparable damage to the
catalysts.
NOTE: If the previous checks and
adjustments are satisfactory but the
engine will not start, the ignition and fuel
injection electrical circuits must be checked using
the appropriate recommended equipment.

MFI
3
FAULT DIAGNOSIS FUEL PRESSURE CHECK
In order to check the fuel pressure it is necessary to
first depressurise the fuel system as follows:
WARNING: Under normal operating
conditions the multiport fuel injection
system is pressurised by a high pressure
fuel pump, operating at up to 2.3 to 2.5 bar. When
engine is stationary pressure is maintained within
system. To prevent pressurised fuel escaping and
to avoid personal injury it is necessary to
depressurise multiport fuel injection system
before any service operations are carried out.
If vehicle has not been run there will be a small
amount of residual pressure in fuel line. The
depressurising procedure must still be carried out
before disconnecting any component within the
fuel system.
The spilling of fuel is unavoidable during this
operation. Ensure that all necessary precautions
are taken to prevent fire and explosion.
A Pressure gauge 18G1500
B Fuel tank and pump
C Fuel filter
D Fuel injectors x 8
E Regulator1.Remove fuel pump relay module.
See Repair,
Multiport Fuel Injection Relay
2.Start and run engine.
3.When sufficient fuel has been used to cause fuel
line pressure to drop, injectors will become
inoperative, resulting in engine stall. Switch off
ignition.
4.Disconnect battery negative lead. .
NOTE: Fuel at low pressure will remain in
system. To remove low pressure fuel,
place absorbent cloth around fuel pipe at
the filter during disconnection.
5.Connect the pressure gauge on the outlet from
the filter, located on the chassis under the right
rear wheel arch.
6.Reconnect the battery and turn the ignition to
position II while observing the pressure gauge.
Results
Expected reading 2,39-2,672 kgf/cm
2
Pressure drop-max 0.7 kgf/cm2in one minute.
If pressure is low check that filter is not blocked
and pump is operating satisfactorily. Then
recheck pressure. If pressure is still low renew
regulator.
See Repair, Fuel Pressure
Regulator

MFI
1
REPAIR AIR CLEANER ASSEMBLY
Service repair no - 19.10.01
Remove
3.9 V8 vehicle illustrated
1.Release 2 clips securing air cleaner to air flow
sensor.
2. 3.9 V8 only:Release clip and disconnect hose
from air cleaner.
4.0 V8 only:Release clip and disconnect
multiplug from intake air temperature sensor.
See FUEL SYSTEM SFI, Repair, Intake Air
Temperature Sensor
3.From below wheel arch, release 2 rubber
mountings securing bottom of air cleaner to
body.
4.Slide air cleaner backwards and release from
mounting bracket.
5.Remove air cleaner assembly.
Do not carry out
further dismantling if component is removed
for access only.
6.Release 4 clips securing top of air cleaner and
remove.
7.Withdraw air cleaner element and discard.
8. 4.0 V8 only:Remove intake air temperature
sensor from cover.
9.Remove rubber mountings.
Refit
10.Fit rubber mountings to new body.
11. 4.0 V8 only:Fit intake air temperature sensor to
new cover. Tighten to
8Nm.
12.Fit new air cleaner element and secure in
position.
13.Reverse removal procedure.
NOTE: Pull rubber mountings from below
to secure unit to wheel arch.AIR CLEANER ELEMENT
Service repair no - 19.10.08
Remove
1.Release four clips retaining air cleaner cover.
2.Release two clips to air flow meter.
3.Remove air cleaner cover, retain air flow meter
'O'ring.
4.Remove element.
Refit
5.Fit new element.
6.Fit O ring.
7.Position air cleaner cover, secure two clips to air
flow meter.
8.Secure four air cleaner cover clips.

19FUEL SYSTEM
2
REPAIR AIR FLOW SENSOR
Service repair no - 19.22.25
Remove
NOTE: The air flow sensor is not a
serviceable item. In event of failure or
damage the complete unit must be
replaced.
1.Disconnect battery negative lead.
2.Release intake hose clamp, disconnect from
sensor.
3.Disconnect multi-plug.
4.Release two clips securing air cleaner to air flow
sensor. Remove sensor from engine
compartment.
Refit
5.Reverse removal procedure. Ensure multi-plug is
firmly reconnected, and hose clamp at the rear
of sensor is securely tightened, to prevent
unmetered air entering engine.THROTTLE POSITION SENSOR
Service repair no - 19.22.49
Remove
1.Disconnect battery negative lead.
2.Disconnect multi-plug from harness.
3.Remove two screws securing sensor to plenum
chamber and carefully pull sensor off throttle
shaft.
4.Remove old gasket.
Refit
5.Fit new gasket.
6.Align sensor and shaft flats, slide sensor on to
throttle shaft. Secure sensor to plenum chamber.
CAUTION: DO NOT operate throttle
mechanism while throttle position sensor
is loosely fitted, damage may be caused to
throttle position sensor wiper track.