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GEN
INFO
FEATURES
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
, 40.4 psi) higher than the
intake manifold pressure. Accordingly, when the energizing signal from the ECU energizes the
injector, the fuel passage 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 energized (injection duration), the lesser the volume of fuel that is sup-
plied.
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 engine can be supplied at all times in accordance with the driving conditions.
1
Fuel pump
2
Pressure regulator
3
Fuel injector
4
Throttle body
5
Intake temperature
sensor
6
Throttle position sensor
7
Intake air pressure
sensor
8
ECU
9
Atmospheric pressure
sensor
0
Coolant temperature
sensor
A
Cylinder identification
sensor
B
Crankshaft position
sensor
È
Fuel system
É
Air system
Ê
Control system
Illustration is for reference only.