Yamaha FJR1300R Service Manual page 38

Fuel control during normal driving
In synchronous injection during normal driving, fuel is injected on a cylinder-by-cylinder basis when
all of the conditions below are met:
1 Other than the stop mode
2 Cylinder identification completed
3 Other than overrun
To determine the injection timing, the ECU calculates the injection timing through the use of the 3D
control map provided in the ECU, which is based on the throttle position and the engine speed.
The injection duration is based on the basic injection duration (obtained through the throttle position,
intake air pressure, and engine speed) to which injection duration compensation (based on the sig-
nals from various sensors such as the intake temperature sensor, atmospheric pressure sensor,
and O sensor) is added to determine the final injection duration. As a result, fuel is supplied to the
2
cylinders.
• Normal synchronous injection
1 Injector #1
2 Injector #2
3 Injector #3
• Fuel injection control during normal driving
È #1 cylinder fuel injec-
tion timing
#2 #4 #3
4 Injector #4
È Cylinder identification
signal
É Basic injection dura-
tion
1 - 20
FEATURES
#1 #2 #4 #3
É Crankshaft identifica-
tion signal
Ê Injection
Ê Various types of fuel
injection duration com-
pensations
GEN
INFO
#1
Ë Stop
Ë Synchronous injection
duration (final injec-
tion duration)