3
. DIS (DIRECT IGNITION SYSTEM)
ESA - Ignition
Circuitr
y
Similar to DLI, DIS is the system to distribute the high voltage directly to the spark plugs from ignition coils
without using a distributor
. There are various types of current DIS systems, including those in which an igni-
tion coil is provided for each cylinder and those in which an ignition coil is provided for every two cylinders
(See Step 2, Vol
. 3, "Ignition System")
. The electrical circuitry shown here is for the type in which an igni-
tion coil is provided for each cylinder
.
Igniter
Engine ECU
Constant
voltage
circui
t
Ignition
switc
h
Battery
I
i
i
Spark Ignition
plugs coils
U
U
a)
>
~
G
T
GT
IGT
z
GT
o
Lock
prevention
circui
t
Constan
current
control
circuit
Dwell angle
control
Circui
t
Ignition
delecting
circuit
F-•I
TACH, lGF
signal outpu
circuit
O
•TAC
H
2JZ-GTE ENGINE (May, 1993)
Control by the Engine ECU is basically the sam
e
as that of an ordinary ESA
. The difference is tha
t
the Engine ECU has the same number
of IGT IGT,
ON
OFF ~
signals as the number of ignition coils
. IGT signals O
N
are then sent to the igniter according to the igni-
IGT5
OF
F
tion sequence
.
IGT
3
IGT
6
IGT
2
IGT4
ON
OF
F
ON
OF
F
ON
OFF
ON
OF
F
IGF* ON
OFF
0
m
m
m
U
0
a
N
E
Sensor
s
l
*The IGF signals in DIS is normally HI (ON)
,
and turns to LO (OFF) during ignition
.
IG
F
88
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