1996 LAND ROVER DEFENDER turn signal

19FUEL SYSTEM
10
DESCRIPTION AND OPERATION Under varying engine speed and load condition the
control unit sends a signal to open the vacuum
modulator which allows a vacuum to be applied above
the EGR diaphragm. The vacuum supply is taken from
a 'T' connector in the brake servo hose. This process
is controlled by an engine speed/load map stored in
the EGR control unit memory.
Engine speed is measured by monitoring the
waveform present on one phase of the generator.
Throttle position is measured via a sensor mounted on
the fuel injection pump throttle lever. Closed loop
control is achieved by allowing the control unit (ECU)
to continually monitor EGR valve lift via the sensor
mounted on the valve; this valve lift is compared with
the actual valve lift required on the control unit map
and adjusted, if necessary.
With coolant temperature between 20°C and 100°C,
the engine having just returned to idle, EGR will shut
off after 25-30 seconds idling.

19FUEL SYSTEM
2
REPAIR
13.Remove banjo bolts securing spill return, main
fuel and boost signal pipes, refit banjo bolts after
disconnecting pipes.
14.Remove 2 bolts securing rear of pump to
mounting bracket.
15.Remove 3 pump securing nuts at flange and
withdraw pump and gasket.
16.Fit suitable caps to pipe connections to prevent
ingress of dirt.
Refit
17.Clean mating faces of pump and front cover and
fit new gasket into position over pump mounting
studs.
18.Remove pump blanking plugs.
19.Slacken the 3 bolts, securing injection pump
mounting bracket to cylinder block, sufficiently
enough to allow bracket to move.
20.Fit pump to cover and secure with 3 nuts.
Tighten to
25 Nm (18 lbf/ft).
21.Loosely attach pump to mounting bracket with
nuts and bolts, then tighten bolts securing
bracket to cylinder block and bolts securing
pump to bracket, finger tight only.
22.To ensure correct fitting and alignment of
injection pump, first tighten the 2 bolts securing
pump to mounting bracket to
25 Nm (18 lbf/ft).
Then tighten the 3 bolts securing mounting
bracket to cylinder block, also to
25 Nm (18
lbf/ft).
23.Connect spill return and main fuel pipes and
secure with banjo bolts. Tighten to
25 Nm (18
lbf/ft).
24.Connect boost signal pipe and secure with banjo
bolt. Tighten to
10 Nm (7 lbf/ft).
25.Connect fuel cut-off solenoid lead and throttle
position sensor multi-plug, if fitted.
26.Connect throttle cable and where applicable,
hand throttle cable.
27.Remove pump gear retaining toolLRT-12-045.
28.Carefully turn the pump hub nut in a clockwise
direction, sufficiently enough to enable timing
tool pin to be inserted into injection pump.
29.Fit gear retaining plate and secure with 3 bolts.
Tighten to
25 Nm (18 lbf/ft).
30.Remove timing pin.
31.Ensure flywheel timing pin is disengaged from
slot in flywheel.
32.Turn crankshaft two complete revolutions, check
timing pin fromRT-12-045can be fully and
easily inserted into the pump. At the same time
check flywheel timing pinLRT-12-044can also
be inserted in the flywheel slot.
33.If, with the flywheel timing pin located, the timing
pin cannot be inserted cleanly into the injection
pump, carry out the following:
a.Ensure flywheel timing pin is disengaged from
slot in flywheel.
b.Slacken the 3 pump gear retaining bolts.
c.Turn the pump hub nut in a clockwise
direction, sufficiently to enable timing tool pin to
be easily inserted into the injection pump.
d.Keeping the tension on the hub nut, check
that flywheel timing pin locates with slot in
flywheel.
e.Tighten the 3 pump gear retaining bolts to
25
Nm (18 lbf/ft).
f.Remove timing pins from pump and flywheel
housing.
34.Using a suitable anti-seize compound, fit the
blanking plug to flywheel housing. Tighten to
12
Nm (9 lbf/ft).
35.Fit access plate with gasket to front cover plate.
Tighten bolts to
25 Nm (18 lbf/ft).
36.Refit injector pipes.
37.Reconnect battery.

86ELECTRICAL
2
DESCRIPTION AND OPERATION VEHICLE IMMOBILISATION AND ALARM SYSTEM
A sophisticated engine immobilisation and anti-theft
alarm system is offered on the Land Rover Defender
300 Tdi vehicle range, which incorporates the
following features:
Perimeter protection
This part of the alarm system protects side doors,
bonnet and rear door against unauthorised entry -
alarm sounding if any one of these apertures is
opened without alarm first being disarmed.
Interior protection
Also known as volumetric protection, this part of the
system protects space inside the vehicle. Once
armed, the alarm will sound if a door is opened, or if
movement is detected inside the vehicle.
Engine immobilisation
The engine is immobilised electronically whenever the
alarm system is armed. Even if the alarm has not
been armed, engine immobilisation will occur
automatically thirty seconds after the driver's door is
opened, or five minutes after the starter switch is
turned to position '0'.
ALARM SYSTEM COMPONENTS
Electronic control unit (ECU)
The ECU is the alarm system brain and controls all
vehicle immobilisation and alarm functions. It
responds to the inputs received, by supplying suitable
outputs to indicate status of the alarm system or
activating relevant warning devices. unit is located
under fascia behind instrument binnacle.
Handset and key
The handset is the primary source of control for the
alarm system i.e. it arms and disarms the alarm
components. The key can be used to override engine
immoblisation if the handset is lost or fails to operate,
seeEngine immobilisation override.The handset battery should last for approximately
three years dependent upon use. The following
symptoms will be noticed when the battery requires
replacement:
1.The handset will only work every other operation
while disarming.
2.The direction indicator lamps will not flash when
the alarm is disarmed.
For battery replacement procedure, seeHandset
Battery.
Passive coil
The passive coil is fitted on the starter switch and
activates a receiving coil in the handset, causing it to
automatically transmit a remobilisation signal to the
ECU.
Aerial
The aerial is integral within the alarm system harness
and supplies the ECU with the signal received from
handset.
Immobilisation spider
The immobilisation spider provides an interface
between ECU and immobilised areas of the vehicle.
This is installed in a sealed (safe) box inside the
vehicle battery box.
Digital diesel shut-off valve - 97 MY
When fitted, the digital diesel shut-off valve
immobilises the fuel injection pump by preventing
power reaching the fuel shut-off solenoid,
See
Immobilisation and alarm system circuit diagram -
with DDS
.