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24
ELECTRONIC FUEL INJECTION - AFC
Throttle Switch
Th
is switch
provides
the control unit
information for
mixture
cond itions.
It is not necessary to adjust this switch
Problem
condition:
Low
engine
power
Troubleshooting:
Disconnect the
wires from
Slowly
open the throttle
Ignition Distributor
The
ignition
distributor provides
engine
(rpm)
and
sequence
Operation
In add it
ion
to delivering
th
e
contact
breaker points
th
e
con
t
ro
l
unit.
Each
a square wave (2) within
square
wave impulses are then presented to a
wh ich provides a single pu
sequ
ence
of
four
input
of two
revo
lutions
of
is,
f
ollowi ng each
revo
four
fuel
injectors
have
impulse
(5).
Thus the fuel injectors
amount of fuel
independent
the
air
sensor
flap.
The
of
the amount necessary for the correct fuel
mix
ture.
Since the crank
cycle, two injector sequences are put
thus
each cylinder receives
for each f iring
stroke.
with necessary
enrichment
and full load
.
the switch and connect an ohm meter between contacts 3
valve.
The resistance must
the control
for
activating the fuel
impulses to
the
ignition
also
supply impu lses
impulse (1) is
converted
the
control
unit.
These
Ise
output for each
pu Ises wh ich are the resu
the
motor crank shaft.
lu
tion
of th
e
crank
shaft
received an activat
ing
inject
a defin
from the position of
injected fuel is always
shaft turns
tw ice for each
into
operation
the
full
amount
of fuel
change
from
00
unit w ith
information
injectors.
coil,
Zyl.
t
o
Zyl.4
to
Zyl.
Zyl.2
gate (3)
1
break
er
impulses
It
-
- - t
Th
at
2
im
pulse
all
shaper
ite
3
frequency
d ivider
half
4
air flow
sensor
flap
position
(pot
entiometer)
'5 injection impul
(duration
of
injecti
on)
- - -
suction
compression
ignition
exhaust
8
and
to
0
concern ing
the
speed
o
360
1
3
- ,
:
18.
of
th
e
o
crankshaft angle
7
20
·
I
control unit
(electronic)
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