1995 LAND ROVER DISCOVERY ECU

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.

19FUEL SYSTEM
2
FAULT DIAGNOSIS BASE IDLE SPEED SETTING
NOTE: Base idle speed is set at factory. It
should not require further adjustment
unless plenum chamber is changed. The
adjustment screw is sealed with a plug to prevent
unauthorised alteration. Check ignition timing
before attempting following procedure, since this
will affect idle speed.
Equipment required
Two blanking hoses.these are manufactured using
a new air by-pass valve hose - Part No.ETC7874. Cut
two equal pieces 90mm long from hose and seal one
end of each, using 13mm diameter bar. Use a suitable
clamp to ensure an air tight seal.
Checking procedure
1.Drive vehicle at least two miles until engine and
transmission are hot. Switch off engine.
2.Check all electrical loads are OFF, including air
conditioning.
3.Remove air by-pass valve hose.
4.Fit blanking hoses to both plenum chamber and
air by-pass valve. Ensure hoses are securely
fitted to prevent air leaks. Note throttle cable and
cruise control actuator have been omitted from
illustration.5.Start engine and check idle speed is within
limits.
See ENGINE TUNING DATA,
Information, Engine 3.9 v8i
Adjusting base idle speed
6.Drill tamper proof plug and insert a self tapping
screw to enable plug to be extracted.
7.Start engine, adjust idle screw clockwise to
decrease or counter-clockwise to increase idle
speed.
8.Stop engine, remove blanking hoses. Reconnect
hose to plenum.
9.Fit new tamper proof plug.

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.

MFI
3
REPAIR IDLE AIR CONTROL VALVE
Service repair no - 19.22.54
Remove
1.Disconnect battery negative lead.
2.Disconnect multi-plug.
3.Unscrew valve from rear plenum chamber.
4.Remove washer.
Refit
5.FitNEWsealing washer.
NOTE: If same idle air control valve is
being refitted clean sealing compounds
from threads. Apply Loctite 241 to threads
of valve before reassembly.
6.Tighten valve to
20 Nm.
7.Reverse removal procedure.VEHICLE SPEED SENSOR
Service repair no - 88.30.14
The vehicle speed sensor is located in the LH side of
the transfer box.
Remove
1.Place vehicle on lift, apply parking brake.
2.Disconnect battery negative lead.
3.Raise lift, disconnect multiplug from vehicle
speed sensor.
4.Remove screw securing sensor to transfer box.
5.Remove vehicle speed sensor
Refit
6.Reverse removal procedure.

19FUEL SYSTEM
4
REPAIR MULTIPORT FUEL INJECTION RELAYS
Service repair no - 19.22.08
The two Multiport fuel injection relays are located in
the RH footwell area behind the 'A' post trim panel.
The fuel injection relays can be identified as follows:
A. Fuel pump relay - Blue base
B. Main relay - Black base
Remove
1.Release front door seal from 'A' post.
2.Remove lower 'A' post trim panel.
3.Pull relay from base.
Refit
4.Reverse removal procedure.ENGINE CONTROL MODULE (ECM)-14 CUX
Service repair no - 19.22.34
NOTE: The ECM is not serviceable, in
event of unit failure it must be replaced.
Remove
1.Remove the fascia right-hand closing panel.
2.Remove the right-hand footwell side panel trim.
3.Disconnect battery negative lead.
4.Release ECM plug retaining clip.
5.Maneouvre the front of the plug (in the direction
of the bold arrow) and detach the other end of
the plug from the retaining peg.
6.Release the two screws securing the ECM to the
right-hand footwell side panel.
7.Withdraw the ECM from the clip.
Refit
8.Refit the ECM securely in the clip and fit the two
screws.
9.Reconnect the ECM harness plug. Ensure that
the plug is pushed firmly into its location and that
the retaining clip secures the plug in position.
10.Reverse removal procedure.