Yamaha XV1700P Service Manual page 23

• Ignition control
The ignition timing control uses the signals from the throttle position sensor (to detect the angle of
the throttle), and the crankshaft position sensor (to detect the speed of the engine) and the speed
sensor. This control establishes an ignition timing that suits the operating condition of the engine
through compensations made to the basic ignition timing control map. The ignition energizing
duration control establishes the energizing duration to suit the operating conditions by calculating
the energizing duration in accordance with the signal received from the crankshaft position sensor
and the battery voltage.
• Fuel control
The fuel control function of the ECU controls the injection timing and injection duration. The injec-
tion timing control controls the injection timing during the starting of the engine and the injection
timing during the normal operation of the engine, based on the signals received from the crank-
shaft position sensor and the cylinder identification sensor. The injection duration control deter-
mines the duration of injection based on the signals received from the atmospheric pressure
sensors, temperature sensors, and the position sensors, to which compensations are made to suit
various conditions such as the weather, atmospheric pressure, starting, acceleration, and deceler-
ation.
• Load control
The ECU effects load control in the following manner:
1. Stopping the fuel pump and injectors when the motorcycle overturns
The ECU turns OFF the fuel injection system relay when the lean angle cut-off switch is tripped.
2. Operating the headlight illumination relay
The ECU controls the headlight relay in accordance with the engine speed as required by the
daytime illumination specification.
3. Operating the liner control valve
The ECU controls the liner control valve to increase the intake air volume for starting the engine
under cold conditions.
4. Operating the automatic decompression solenoid valve
The ECU controls the operation of the automatic decompression solenoid valve when the
engine is started.
FEATURES
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