Yamaha XV1700PCR Road Star Warrior, Service Manual

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GEN
INFO
FEATURES
• Deceleration control
Deceleration control is effected in accordance with the signals from the throttle position sensor. As
the rider operates the accelerator to decelerate the motorcycle that is in motion, the throttle position
sensor actuates in unison with the accelerator. When the engine speed is greater than a prescribed
value with the throttle fully closed (thus applying engine braking), the ECU executes a deceleration
fuel cut-off. The injection of fuel to all the cylinders is stopped when fuel cut-off control is executed,
thus improving fuel economy.
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Engine speed
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Duration
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Fuel cut-off control (stopping fuel injection)
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Basic injection duration
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Basic injection duration
• Over-revolution control
The over-revolution control of the ECU operates the ignition control and fuel cut-off control when the
engine speed becomes greater than the specified value. The over-revolution control first operates
the ignition control to reduce the ignition of each cylinder to keep the engine speed from rising. If the
engine speed increases after the ignition control is activated, the fuel cut-off control is activated. The
fuel cut-off control is first activated in cylinder #1, then in cylinder #2 as the engine speed increases
further.
In addition, specified engine speeds are set at each gear position, therefore, over-revolution control
can be achieved more accurately.
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É
Ê
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