Yamaha YZF-R1(B) 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

FEATURES1-9TCS (Traction control system) block diagramThe signals from the front and rear speed sensors are sent to the ECU, and the ECU calculates theamount of slip according to the difference between the detected front and rear wheel speeds.If the amount of slip exceeds the preset value, the ECU controls the ignition timing, fuel cut-off, andthrottle valve opening of the YCC-T system so that the amount of slip is less than the preset value.The traction control system indicator/warning light in the meter assembly flashes when the tractioncontrol system has activated.TCS (Traction control system) functionThe traction control system helps maintain traction when accelerating. If sensors detect that the rearwheel is starting to slip (uncontrolled spinning), the traction control system assists by regulatingengine power as needed until traction is restored. The traction control system indicator/warning lightflashes to let the rider know that traction control has engaged.WARNINGEWA23P1039The traction control system is not a substitute for riding appropriately for the conditions.Traction control cannot prevent loss of traction due to excessive speed when entering turns,when accelerating hard at a sharp lean angle, or while braking, and cannot prevent frontwheel slipping. As with any motorcycle, approach surfaces that may be slippery with cautionand avoid especially slippery surfaces.TIP• The traction control may engage when the vehicle travels over a bump.• The rider may notice slight changes in engine and exhaust sounds when the traction control sys-tem is engaged.1. Front speed sensor2. Rear speed sensor3. Traction control system switch4. ECU (engine control unit)A. Slip amount calculationB. Exceeds preset valueC. Actuator controlD. Fuel cut-offE. Ignition timing (retarded)F. Traction control system indicator/warninglight (flashes)G. YCC-T motor throttle valve opening(decreased)