Wheel speed sensors determine when a wheel loses traction and as a result, engine torque to that wheel is reduced. Brakes are applied to the traction-less wheel and it is slowed down to match speed of the other driven wheel(s).
TCS control actuates torque reduction through electronic throttle control, fuel cut and ignition timing control, as well as using brake control to control traction.
The left and right wheels are controlled at the same time by electronic throttle control, fuel cut and ignition timing control. Therefore, when the road surface friction differs between the left and right wheels, proper torque reduction cannot be performed separately for each wheel. When this occurs, torque reduction is performed by independent left and right wheel brake control, providing stable vehicle control.