There are 2 methods for traction control....


1) As wheel spin is detected, the ignition is retarded or boost lowered
to reduce total engine output power to stop the loss of grip.
Result - The car slows down !

2) Using ABS servos of the braking system (if fitted on the car).
When wheel slip is detected, the brake on the spinning wheel is
activated electronically momentarily.
The result, power is diverted to the wheel that isnt spinning.
Result - The non spinning wheel will probally start to spin.