1 - 3
GEN
INFO
FEATURES
EAS00897
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
2
, 34.1 ~ 37.0 psi) higher than the intake manifold pressure. Accordingly, when the ener-
gizing 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. There-
fore, 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 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 (engine). Signals that are
input from the throttle position sensor, crankshaft position sensor, intake air pressure sensor, intake
air temperature sensor, coolant temperature sensor, and O
2
sensor enable the ECU (engine) to
determine the 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 sup-
plied at all times in accordance with the driving conditions.
1
Fuel pump
2
Fuel injector
3
Ignition coil
4
ECU (engine)
5
Catalyst
6
O
2
sensor
7
Coolant temperature sensor
8
Crankshaft position sensor
9
Intake air pressure sensor
0
Throttle body
A
Intake air temperature sensor
B
Air filter case
C
Throttle position sensor
È
Fuel system
É
Air system
Ê
Control system
2
3
4
6
7
8
9
0
A
B
1
5
È
É
Ê
C
Illustration is for reference only.
Summary of Contents for XP500
Page 1: ...2005 XP500 XP500A5VU5 AE1 SERVICE MANUAL...
Page 2: ......
Page 8: ......
Page 9: ...GEN INFO 1...
Page 11: ...GEN INFO...
Page 38: ...SPEC 2...
Page 40: ...SPEC...
Page 68: ...2 28 SPEC OIL FLOW DIAGRAMS 1 Oil strainer 2 Crankshaft...
Page 69: ...2 29 SPEC OIL FLOW DIAGRAMS 1 Clutch 2 Right main journal bearing 3 Main gallery plug...
Page 118: ......
Page 119: ...CHK ADJ 3...
Page 193: ......
Page 194: ...CHAS 4...
Page 198: ...CHAS...
Page 292: ...4 94 CHAS ANTI LOCK BRAKE SYSTEM XP500A...
Page 326: ......
Page 327: ...ENG 5...
Page 331: ...ENG...
Page 424: ...COOL 6...
Page 426: ...COOL...
Page 442: ......
Page 443: ...FI 7...
Page 445: ...FI...
Page 476: ...ELEC 8...
Page 544: ......
Page 545: ...TRBL SHTG 9...
Page 553: ......
Page 556: ......
Page 557: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN...