2009 Ford Expedition EL Owner Guide 2nd Printing - Page 293
2009 Ford Expedition EL Manual
Page 293 highlights
Driving When AdvanceTrac with RSC performs a normal system self-check, some drivers may notice a slight movement of the brake, and/or a rumble, grunting, or grinding noise after startup and when driving off. When an event occurs that activates AdvanceTrac with RSC you may experience the following: • A slight deceleration of the vehicle • The "sliding car" indicator light will flash. • A vibration in the pedal when your foot is on the brake pedal • If the driving condition is severe and your foot is not on the brake, the brake pedal may move as the systems applies higher brake forces. You may also hear a whoosh of air from under the instrument panel during this severe condition. • The brake pedal may feel stiffer than usual. Traction Control (TCS) Traction Control is a driver aid feature that helps your vehicle maintain traction of the wheels, typically when driving on slippery and/or hilly road surfaces, by detecting and controlling wheel spin. Excessive wheel spin is controlled in two ways, which may work separately or in tandem: Engine Traction Control and Brake Traction Control. Engine Traction Control works to limit drive-wheel spin by momentarily reducing engine power. Brake Traction Control works to limit wheel spin by momentarily applying the brakes to the wheel that is slipping. Traction Control is most active at low speeds. in the During Traction Control events the "sliding car" icon instrument cluster will flash. If the Traction Control system is activated excessively in a short period of time, the braking portion of the system may become temporarily disabled to allow the brakes to cool down. In this situation, Traction Control will use only engine power reduction or transfer to help control the wheels from over-spinning. When the brakes have cooled down, the system will regain all features. Anti-lock braking, RSC, and ESC are not affected by this condition and will continue to function during the cool-down period. The Engine Traction Control and Brake Traction Control system may be deactivated in certain situations. See the Switching Off AdvanceTrac with RSC section following. 293 2009 Expedition (exd) Owners Guide, 2nd Printing USA (fus)