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14-18
FUEL SYSTEM - Control
of
Ignition Timin5il
Current Flow Time
11 determines
the
ignCtion cylinder basad on the
TDC
sensor signa'-
calculates
ign
ition timing
based on
the
crank angle sensor signal arid sends
an
ignition
coil primary current interrupt sigosl to
th
e
power transistor.
If
a
TDC
sensor
signal (High)
is
input
when
the
crank angle sensor SigMI changes from Low
to
High,
it
i
~
jlJdged that there is
compression in
cylinder
No.2
lor cylinder No.5), turns power
transistor B off for
igilion
in
cylinder No_ 2 land
cylirJdef No
_
51.
When
the
crank Mgle sensor signal changes from
Low
\0 High,
a
TOC
sensor
signal
(Low) is
input
and then, when the crank angle sensor signal
Cr.
ok
O"ll'"
,
.
""or
.
igMi;
,
~
"
TOC sensor signal
Cran'-
ang!<l
"8I10or
signol:
"~,
Ignition
cylinder
changes from
High
to
Low,
it
ju~es
that thera
is
compressioo in cylinder No.3 lor cylinder No.6) if
the TOC sensor signal (High) is
input,
and
turns
power
t",nsistor
C
off for
ignition in
~ylinder
No_ 3
(or cylinder No.6).
Furthermore.
when the
crank
angle sensor sig",,1
charJges from
Low
10 High. a TDC sensor signal
(Low)
is
input and
then.
when the crank angle
sensor signal changes from High to Low.
it
judges
that
the
re
is
compression
in
cylinder
No.
1 (or
cylinder No.4) if TOC sensor signal (Low) is
input
and turns power
transistor A
off for
i
~
nition
of
cylinder NO.1 (or cylinder No.4).
"
,
-
"
,
2
and
5
3and5
"""
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