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1-3
FEATURES
GEN
INFO
Illustration is for reference only.
6 Throttle position sen-
sor
7 Intake air pressure
sensor
8 ECU
9 Atmospheric pressure
sensor
10 Coolant temperature
sensor
11 Cylinder identification
sensor
12 Crankshaft position
sensor
A Fuel system
B Air system
C Control system
1 Fuel pump
2 Pressure regulator
3 Fuel injector
4 Throttle body
5 Intake temperature
sensor
EAS00897
FI SYSTEM
The fuel pump delivers fuel to the injector via the fuel filter. The pressure regulator maintains the fuel
pressure that is applied to the injector at only 284 kPa (2.84 kg/cm
2
) higher than the intake manifold
pressure. Accordingly, when the energizing signal from the ECU energizes the injector, the fuel pas-
sage opens, causing the fuel to be injected into the intake manifold only during the time the passage
remains open. Therefore, the longer the length of time the injector is energized (injection duration), the
greater the volume of fuel that is supplied. Conversely, the shorter the length of time the injector is ener-
gized (injection duration), the lesser the volume of fuel that is supplied.
The injection duration and the injection timing are controlled by the ECU. Signals that are input from the
throttle position sensor, crankshaft position sensor, intake air pressure sensor, atmospheric pressure
sensor, intake temperature sensor and coolant temperature sensor enable the ECU to determine the
injection duration. The injection timing is determined through the signals from the crankshaft position
sensor and the cylinder identification sensor. As a result, the volume of fuel that is required by the en-
gine can be supplied at all times in accordance with the driving conditions.