First Idle Control System; Basic Operation - Yamaha XV1700PCRC Service Manual

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FIRST IDLE CONTROL SYSTEM

This system temporarily increases the fuel injection volume of the injectors when starting a cold

engine and until the engine is warm. The system improves startability and stabilizes engine speed

during engine warm up.

The ECU receives a signal from the engine temperature sensor and determines the temperature of

the engine with the collected data. Based on this data, the ECU regulates the linear control valve.

The linear control valve sends air from the silencer air filter case to the intake manifold to increase

the intake air volume. When the engine is started and during engine warm up, the fuel injection vol-

ume is increased to compensate the increase in the air volume.

A signal from the ECU and the temperature of the engine immediately after starting, determine the

air volume introduced by the linear control valve. When the engine is running, the engine oil temper-

ature controls the linear control valve. If the temperature is low, the intake air volume increases. If

the temperature is high, the intake air volume decreases. Furthermore, if the temperature reaches

80 °C or higher, the valve fully closes to stop the intake air volume from increasing.

1 Liner control valve

È From silencer air filter case

É To intake manifold - cylinder #2

Ê To intake manifold - cylinder #1