FORD 2010 Expedition v.2 - Manual (Page 297)

Note: If the system cannot be turned off, refer to MyKey™ in the Locks
and Security chapter for more information.
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 system (TCS)
The TCS 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.
During TCS events the “sliding car” icon in the instrument cluster
will flash.
If the TCS 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, TCS 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 traction control
section following.
Driving
297
2010 Expedition (exd)
Owners Guide, 2nd Printing
USA (fus)