Yamaha YZF-R1(B) 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

FEATURES1-4EAS14B1076YCC-T (Yamaha Chip Controlled Throttle) YCC-I (Yamaha Chip Controlled Intake)Mechanism characteristicsYamaha developed the YCC-T and YCC-I system employing the most advanced electronic controltechnologies. Electronic control throttle systems have been used on automobiles, but Yamaha hasdeveloped a faster, more compact system specifically for the needs of a sports motorcycle. TheYamaha-developed system has a high-speed calculating capacity that produces computations ofrunning conditions every 1/1000th of a second.The YCC-T system is designed to respond to the throttle action of the rider by having the ECUinstantaneously calculate the ideal throttle valve opening and generate signals to operate the motor-driven throttle valves and thus actively control the intake air volume.The ECU contains three CPUs with a capacity about five times that of conventional units, making itpossible for the system to respond extremely quickly to the slightest adjustments made by the rider.In particular, optimized control of the throttle valve opening provides the optimum volume of intakeair for easy-to-use torque, even in a high-revving engine.The YCC-I system calculates the value from the engine speed and throttle opening rate, activatesthe intake air funnel with the electronic control motor drive to control the intake pipe length in orderto gain the high power output in all revolution ranges from low speeds to high speeds.Aims and advantages of using YCC-T system• Increased engine powerBy shortening the air intake path, higher engine speed is possible → Increased engine power.• Improved driveabilityAir intake volume is controlled according to the operating conditions → Improved throttle responseto meet engine requirement.Driving force is controlled at the optimal level according to the transmission gear position andengine speed → Improved throttle control.• Engine braking controlDue to the throttle control, optimal engine braking is made possible.• Simplified idle speed control (ISC) mechanismThe bypass mechanism and ISC actuator are eliminated → A simple mechanism is used to main-tain a steady idle speed.• Reduced weightCompared to using a sub-throttle mechanism, weight is reduced.1. Throttle servo motor2. Accelerator position sensor3. Throttle cable pulley with linkage guard4. Throttle valves5. Throttle position sensorA. To throttle grip