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A traction control system -LRB- TCS -RRB- , also known as ASR -LRB- from German Antriebsschlupfregelung , engine slippage regulation -RRB- , is typically -LRB- but not necessarily -RRB- a secondary function of the electronic stability control -LRB- ESC -RRB- on production motor vehicles , designed to prevent loss of traction of driven road wheels .. electronic stability control. electronic stability control. traction. traction ( engineering ). TCS is activated when throttle input and engine torque are mismatched to road surface conditions .. throttle. throttle. torque. torque. Intervention consists of one or more of the following  :. Brake force applied to one or more wheels. Reduction or suppression of spark sequence to one or more cylinders. Reduction of fuel supply to one or more cylinders. Closing the throttle , if the vehicle is fitted with drive by wire throttle. throttle. throttle. drive by wire. drive by wire. In turbocharged vehicles , a boost control solenoid is actuated to reduce boost and therefore engine power .. turbocharged. Turbocharger. Typically , traction control systems share the electrohydraulic brake actuator -LRB- which does not use the conventional master cylinder and servo -RRB- and wheel speed sensors with ABS .. traction. traction ( engineering ). cylinder. cylinder ( engine ). electrohydraulic. Electro-hydraulic actuator