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2
OPERATION
No
MA.IE.
144-00
: Chtiractcristics
o/
the
e 1,-Jc,tror,ic
H clcctroltic
fire1
injc
ctiwt
systettt.
((L-JETRONIC,,
The H L-Jetronic
1) system
is'an
intermittent
low-pressure
injection
system which
injects
petrol
into the inlet
manifold.
The system
measures
the quantity
of air drawn
in by the engine.
which
is the main parameter
for calculating
the amount
of fuel. to be injected.
The metering
of the fuel is carried
out by electro-magnetically
triggered
injectors.
These
are under constant
fuel pressure.
The quantity
of fuel injected
is proportional
to the duration
of injection.
which
in turn is optimally
determined
for any given
engin&
operating
condition
by an electronic
control
unit ( E.C.U.
) from information
supplied
by several
electric
sensors.
One of the principal
contributions
of the H L-Jetronic
H system
is the reduction
in the level
of pollution
of the
exhaust
emissions.
The
(( L-Jetronic
v system
is made
up of the
following
components
:
1
: Electric
fuel pump
2 : Fuel
filter
3 : Thermal
switch
4 :, Double
relay
5 : Electronic
control
unit ( E.C.U.
)
6 : Supplementary
air control
7 : Pressure
regulator
8 : Injectors
9 : Cold-start
injector
10. Idling
speed
adjustment
screw
11
: Air-flow
sensor
( with
incorporated
air temperature
sensor
)
12
: Switch
on throttle
butterfly
spindle
13 : Additional
resistors
for the injectors
(8)
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