service LAND ROVER DISCOVERY 1995 Workshop Manual

SFI
29
REPAIR ADD: 09/95 ANTI-TRICKLE FILL VALVE - ADVANCED EVAPS
Service repair no - 19.55.31
Remove
1.Remove the fuel filler neck.
See fuel filler neck
- advanced evaps
2.Release the cobra clip securing the hose to the
liquid/vapour separator and disconnect the hose.
3.Loosen the grub screw on the valve nut, two
complete turns.
4.Loosen the valve nut completely.
NOTE: The nut is held captive by the stub
pipe on the filler neck.
5.Carefully remove the valve and hose assembly
from the filler neckRefit
6.Fit a new 'O' ring to the recess in the stub pipe.
7.Fit the valve and hose assembly to the filler neck
stub pipe, ensuring that the 'O' ring is fitted
around the body of the valve as it is pushed into
the filler neck stub pipe.
8.Hand tighten the nut, then tighten to
3 Nm.
9.Tighten the grub screw to2 Nm.
10.Connect the hose to the liquid/vapour separator
and secure with the cobra clip.
11.Fit the fuel filler neck.
See fuel filler neck -
advanced evaps;refit

Mpi
1
DESCRIPTION AND OPERATION DESCRIPTION
The Mpi Modular Engine Management System
(MEMS) controls the fuel injection and programmed
ignition systems.
The main features are as follows:
·The Engine Control Module (ECM) controls
programmed ignition and fuel injection. The ECM
incorporates short circuit protection and can
store intermittent faults on certain inputs.
Testbook can interrogate the ECM for these
stored faults.
·The ECM uses the speed/density method of air
flow measurement to calculate fuel delivery. This
method measures the inlet air temperature and
inlet manifold pressure and assumes that the
engine is a calibrated vacuum pump with its
characteristics stored in the ECM
·If certain system inputs fail, the ECM implements
a back-up facility to enable the system to
continue functioning, although at a reduced level
of performance.
·A separate diagnostic connector allows engine
tuning or fault diagnosis to be carried out using
Testbook without disconnecting the ECM
harness connector.
·The ECM harness multiplug incorporates
specially plated pins to minimise oxidation and
give improved reliability.
·The throttle potentiometer requires no
adjustment in service. The following components
supply data for both fuelling and ignition:Ignition system
The ECM determines the optimum ignition timing
based on the signals it receives from the following
sensors:
1.Crankshaft sensor - Engine speed and
crankshaft position.
2.Manifold absolute pressure sensor - Engine load
3.Coolant temperature sensor - Engine
temperature.
4.Manifold absolute pressure sensor - Throttle
closed.
5.Knock sensor - Engine noise and vibration.
MEMS uses no centrifugal or vacuum advance, timing
being controlled by the ECM which is energised by the
main relay, within the relay module. Spark distribution
is achieved by 2 coils mounted at the rear of the
engine and controlled by the ECM.

Mpi
1
REPAIR KNOCK SENSOR
Service repair no - 18.30.18
Remove
1.Disconnect multiplug from knock sensor.
2.Remove knock sensor.
Refit
3.Clean mating face of cylinder block.
4.Fit knock sensor. Tighten to
15 Nm
5.Connect multiplug.IGNITION COILS
Service repair no - 18.20.40 - 1 & 4 Cylinders
Service repair no - 18.20.41 - 2 & 3 Cylinders
Remove
1.Disconnect battery negative lead.
2.Disconnect 4 h.t. leads from coils.
NOTE: Mark the position of the h.t. leads
to ensure correct refitment.
3.Disconnect 2 multiplugs from coils.
4.Disconnect crankshaft sensor multiplug.
5.Remove screw securing crankshaft sensor
multiplug to coil bracket.
6.Remove 3 bolts securing coil bracket to bell
housing.
NOTE: Access to the rear bolts is from
under the vehicle.
7.Remove coil assembly.
Refit
8.Position coil assembly to bell housing.
9.Fit 3 bolts and tighten to the correct torque.
10.Secure crankshaft sensor multiplug to coil
bracket with screw.
11.Connect crankshaft sensor multiplug.
12.Connect multiplugs and h.t. leads to coils.
13.Reconnect battery negative lead.

19FUEL SYSTEM
2
REPAIR COOLANT TEMPERATURE SENSOR
Service repair no - 18.30.10
Remove
1.Position drain tin below coolant pump hose.
2.Disconnect sensor multiplug.
3.Release harness clip and harness.
4.Remove sensor.
Refit
5.Clean sensor.
6.Fit sensor and tighten to the correct torque.
7.Position harness and secure with clip.
8.Connect multiplug.
9.Top-up cooling system.CRANKSHAFT SENSOR
Service repair no - 18.30.12
Remove
1.Position vehicle on ramp [hoist].
2.Disconnect multiplug from crankshaft sensor
flylead.
3.Remove screw, release lead from bracket.
4.Raise ramp [hoist].
5.Remove 2 bolts securing crankshaft sensor.
6.Remove crankshaft sensor.
Refit
7.Clean crankshaft sensor and mating surface of
backplate.
8.Fit crankshaft sensor, fit bolts. Tighten to
7Nm
9.Lower vehicle.
10.Position lead to bracket, fit and tighten screw.
11.Connect multiplug

Mpi
3
REPAIR FUEL TEMPERATURE SENSOR
Service repair no - 18.30.08
Remove
1.Disconnect fuel temperature sensor multiplug.
2.Remove fuel temperature sensor.
3.Discard sealing washer.
Refit
4.Clean mating face of fuel rail.
5.Fit a new sealing washer to sensor.
6.Fit temperature sensor. Tighten to
7Nm
7.Connect fuel temperature sensor multiplug.MEMS ENGINE CONTROL MODULE (ECM)
Service repair no - 18.30.01
Remove
1.Remove 3 bolts securing ECM.
2.Disconnect 2 multiplugs from ECM.
3.Disconnect vacuum hose from ECM.
4.Remove ECM.
5.Collect ECM spacers (LHD only)
Refit
6.Position ECM and spacers to wing [fender].
7.Connect vacuum hose to ECM.
8.Connect multiplugs to ECM.
9.Position ECM to mounting.
10.Fit bolts and tighten.

19FUEL SYSTEM
4
REPAIR CHARCOAL CANISTER
Service repair no - 17.15.13
Remove
1.Disconnect multiplug from purge valve.
2.Release clip and disconnect hose from purge
valve.
3.Release clip and disconnect fuel tank hose from
charcoal canister.
4.Unscrew bolt to release securing strap and
remove charcoal canister.
Refit
5.Fit charcoal canister and secure strap.
6.Connect fuel tank hose to charcoal canister and
secure clip.
7.Connect hose to purge valve and secure clip.
8.Connect multiplug to purge valve.THROTTLE CABLE
Service repair no - 19.20.06
Remove
1.Loosen 2 nuts securing throttle cable to
abutment bracket.
2.Release throttle cable from throttle lever.
3.Remove footwell closing panel.
4.Release split [cotter] pin from throttle pedal
clevis pin.
5.Remove clevis pin and release cable from
throttle pedal.

Mpi
5
REPAIR 6.Remove nut securing throttle cable bracket to
brake servo and release cable.
7.Release grommet from bulkhead and withdraw
cable.
8.Locate cable in bulkhead.
9.Connect cable to throttle pedal.
10.Connect cable to cam.
11.Adjust throttle cable.THROTTLE POTENTIOMETER
Service repair no - 19.22.49
Remove
1.Disconnect throttle potentiometer multiplug.
2.Remove 2 screws securing throttle
potentiometer, remove potentiometer.
Refit
3.Clean mating faces of throttle potentiometer and
throttle housing.
4.Fit throttle potentiometer, fit and tighten screws.
CAUTION: Ensure throttle potentiometer is
correctly engaged with throttle cam and
that wiring outlet faces downwards.
5.Connect multiplug.
6.Check with diagnostic equipment.

19FUEL SYSTEM
6
REPAIR INTAKE AIR TEMPERATURE SENSOR
Service repair no - 18.30.09
Remove
1.Disconnect multiplug from temperature sensor.
2.Remove sensor from inlet manifold.
Refit
3.Clean sensor threads and mating face.
4.Fit sensor to inlet manifold. Tighten to
7Nm
5.Connect multiplug to sensor.PURGE CONTROL VALVE
Service repair no - 17.15.39
Remove
1.Disconnect multiplug from purge control valve.
2.Release clip and disconnect hose from valve.
3.Release valve from charcoal canister.
4.Remove valve.
5.Discard 'O' ring.
Refit
6.Clean valve and valve location.
7.Position and secure valve to charcoal canister.
8.Connect hose to purge valve and secure with
clip.
9.Connect multiplug to valve.

Mpi
7
REPAIR FUEL RAIL AND INJECTORS
Service repair no - 19.60.04 - Rail
Service repair no - 19.60.10 - Injectors
Remove
1.Remove inlet manifold chamber gasket.
See
MANIFOLD AND EXHAUST SYSTEM, Repair,
Manifold Chamber Gasket - Mpi
2.Remove pressure regulator.
3.Remove 4 bolts securing fuel feed hose flange
stiffening bracket, remove stiffening bracket.
4.Release fuel feed hose from fuel rail.
5.Discard 'O' ring.
6.Disconnect 4 injector multiplugs.
7.Move injector harness aside.
8.Remove 2 bolts securing fuel rail to inlet
manifold.
9.Release 4 injectors from inlet manifold.
10.Remove fuel rail complete with injectors.
11.Discard outlet 'O' rings from injectors.
12.Fix protective cap to each injector.
Do not carry out further dismantling if component
is removed for access only.
13.Remove clip(s) securing injector(s) to fuel rail.
14.Remove injector(s).
15.Discard inlet 'O' ring(s) from injector(s).
16.Remove fuel temperature sensor.

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.