Fi System - Yamaha YZF-R6T Supplementary Service Manual

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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
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.
Illustration is for reference only.
Fuel pump
1
Pressure regulator
2
Fuel injector
3
Throttle body
4
Intake temperature
5
sensor
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Throttle position sen-
6
sor
Intake air pressure
7
sensor
ECU
8
Atmospheric pressure
9
sensor
1-3
FEATURES
2
) higher than the intake manifold
Coolant temperature
10
sensor
Cylinder identification
11
sensor
Crankshaft position
12
sensor
GEN
INFO
A Fuel system
B Air system
C Control system