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EAS15B1003
FI SYSTEM
The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regulator (in the fuel
pump) maintains the fuel pressure that is applied to the fuel injector at 240 – 260 kPa (2.40 – 2.60 kg/cm
34.1 – 37.0 psi) higher than the intake manifold pressure. Accordingly, when the energizing signal from
the ECU (engine) energizes the fuel 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 fuel injector is energized (injection duration), the greater the volume of fuel that is
supplied. Conversely, the shorter the length of time the fuel injector is energized (injection duration),
the lesser the volume of fuel that is supplied.
The injection duration and the injection timing are controlled by the ECU (engine). Signals that are input
from the throttle position sensor, crankshaft position sensor, intake air pressure sensor, intake air tem-
perature sensor, coolant temperature sensor, and O
injection duration. The injection timing is determined through the signals from the crankshaft position
sensor. As a result, the volume of fuel that is required by the engine can be supplied at all times in ac-
cordance with the driving conditions.
1. Fuel pump
2. Fuel injector
3. Ignition coil
4. ECU (engine)
5. Catalyst
6. O
sensor
2
7. Coolant temperature sensor
8. Crankshaft position sensor
9. Intake air pressure sensor
10. Throttle body
11. Intake air temperature sensor
12. Air filter case
13. Throttle position sensor
sensor enable the ECU (engine) to determine the
2
A. Fuel system
B. Air system
C. Control system
1-3
FEATURES
2
,
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