EFI - Fuel Syste
m
FUEL SYSTE
M
Fuel pumped out of the fuel tank by the fuel
pump passes through the fuel filter, then is sent
to the injectors
. The fuel pressure at the
injectors is maintained at a constant high level
(285 kPa [2
.9 kgf/cm2
; 41
.2 psi] or 250 kPa [2
.55
kgf/cmz
; 35
.5 psi], depending on the engine
model), which is greater than the intake
manifold pressure
. When fuel is injected, the
fuel pressure in the fuel line changes slightly
.
Some engines are equipped with a pulsation
damper to prevent this from occurring
. One
injector is mounted in front of each cylinde
r
Injector
s
------
»
--------
T
r-REFERENC
E
1
. Multi-point Injectio
n
Each cylinder has its own injector, and
fuel is injected in front of the intake ports
near the cylinders
. This is the method
used in most EFI engines
.
Xb
Solenoid
resistor*
(except in the case of the single-point injector
for the 1S-i engine), and the amount of fuel
injected is controlled by the length of time
current is sent to the injectors
.
A single cold start injector is also mounted in the
intake chamber to improve startability in cold
weather
. (This system is not included in some
engines
.
)
The injection duration of the cold start injector is
controlled by a start injector time switch
. (In
some engines, it is controlled by both the ECU
and the start injector time switch
.
)
lC
Pressure
regulato
r
Cold sta
rt
injector
*
2
. Single-point Injection
(
Central Injection)
The single injector is mounted in the
throttle body and fuel is injected at this
point into the intake air stream
. This
method is used in the 1S-i engine only
.
53
To Next Page
Loading...
Need help?
General
