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FUEL SYSTEM - Actuatol'$
14-11
ACTUATORS
IGNITION COIL
oontrol unit
When power transistor A is turned on by the
signal irom the engine
control
unit. primary
current
flows in ignition coil A.
When power
transistor A is turned oft primary current is
cut off,
high voltage is generated
in
the
secondary coil A
and spark plugs for No. 1 and No.4 cylinders
Sp;.!r'.
On the other hand, when power transistor
B is turned off and
prim~ry
current to ignition coil
B
is
cut off, spark plugs for No.2 and No. 5
cylinders spark.
In
addition, when power
transistor C
is
turned off. sp;.!r' plugs for No.3 and
No.6 cylinders spark.
7fU01U
When
NO.
1
cylillder
is
in
its compression
stroke
lat this time
No.
4 cylinder is in its exhaust slro'el.
power transistor A is turned oif; when
No. 2
cylinder
is in its
compression stroke (at this time
No.
5 cylinder
is
in
its exhaust stroke!.
power
tranSistor
B
is
turned off: again when No. 3
cylinder
is in its compression
stroke (at this time
No.6 cylinder is
in
its
exhaust stroke), power
transistor C is turned off.
In
this
way, sparking
cylillder and ignition timing are controlled
by
the
selective control of power transistors
A.
B alld C.
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