Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 100

3 . DIS (DIRECT IGNITION SYSTEM)
ESA - Ignition Circuitry
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
circuit
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 .
IGF
88