FORD 2013 Expedition v.3 - Manual (Page 223)

4WD switch positions
WARNING: Utility and four-wheel drive vehicles are not
designed for cornering at speeds as high as passenger cars any
more than low-slung sports cars are designed to perform satisfactorily
under off-road conditions. Avoid sharp turns or abrupt maneuvers in
these vehicles.
Note: If your vehicle is equipped with AdvanceTrac® with RSC®, the
system will automatically turn off the stability enhancement feature
when you shift the 4WD system into 4L (4X4 LOW). You can manually
turn the system off by pressing the AdvanceTrac button, see the
Traction Control chapter for more information. This will disable the
engine management feature, allowing the vehicle to maintain full power
and enhanced momentum through the obstacle. The brake traction
enhancement feature will still be enabled.
Note: The Control Trac® selector knob should not be changed while the
rear wheels are slipping.
222 Four-Wheel Drive (If Equipped)
2013 Expedition (exd)
Owners Guide gf, 3rd Printing, April 2013
USA (fus)