EFI - Fuel Syste
m
7
. INJECTOR
DRIVE METHOD
S
There are two injector drive methods
. One is the
voltage control method, and the other is the
current control method
.
High-resistance
injectors
(Most engines
)
Voltage
contro
l
Injector
drive
method
Low-resistance
injectors
(Some engines)
VOLTAGE CONTROL
METHOD FOR LOW-
RESISTANCE
INJECTOR
S
The electrical circuitry for this type of injector,
as well as its operation, are basically the same
as for the high-resistance injector, but since a
low-resistance injector is used, a solenoid
resistor is connected between the ignition
switch and the injectors
.
The electrical circuitry for simultaneous injection
(See page 66) is shown below
.
Ignition switc
h
Current
control
Low-resistance injectors
(No longer in use
)
VOLTAGE CONTROL
METHOD FOR HIGH-
RESISTANCE INJECTOR
S
Battery voltage is applied to the injectors
directly via the ignition switch
.
When the transistor (Tr) in the Engine ECU goes
on, current flows from terminals No
. 10 and No
.
20 to E01 and E02
. While the Tr is on, current
flows through the injectors and fuel is injected
.
The electrical circuitry for simultaneous injection
(See page 66) is shown below
.
Ignition switch
OHP 49
OHP 49
60
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