Yamaha YZF-R1B 2012 Service Manual page 18

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys
TCS (Traction control system) block diagram
The signals from the front and rear speed sensors are sent to the ECU, and the ECU calculates the
amount 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, and
throttle 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 traction
control system has activated.
1. Front speed sensor
2. Rear speed sensor
3. Traction control system switch
4. ECU (engine control unit)
A. Slip amount calculation
B. Exceeds preset value
TCS (Traction control system) function
The traction control system helps maintain traction when accelerating. If sensors detect that the rear
wheel is starting to slip (uncontrolled spinning), the traction control system assists by regulating
engine power as needed until traction is restored. The traction control system indicator/warning light
flashes to let the rider know that traction control has engaged.
EWA23P1039
WARNING
The 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 front
wheel slipping. As with any motorcycle, approach surfaces that may be slippery with caution
and 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.
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C. Actuator control
D. Fuel cut-off
E. Ignition timing (retarded)
F. Traction control system indicator/warning
light (flashes)
G. YCC-T motor throttle valve opening
(decreased)
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FEATURES