Pretty simple, the trac control use the abs sensor to detrmine the wheels speed and to compare the speed of each wheel. When the computer see a difference of speed between the wheels, it will close the throttle body to lower power or it will stop firing.

Contour 99 MTX V6 fully loaded, stock with 110000km. Illuminated sunroof switch. About to do the mystique rear dome light conversion with eyeball dome light.