Ford Expedition Owner's Manual page 273

CONTROL TRAC FOUR-WHEEL DRIVE (4X4) OPERATION
(IF EQUIPPED)
For important information regarding safe operation of this type
of vehicle, see Preparing to drive your vehicle in this chapter.
If equipped with the Control Trac 4x4 System, and 4L (4x4 LOW)
is selected while the vehicle is moving, the system will not
engage. This is normal and should be no reason for concern.
Before 4L (4x4 LOW) can be engaged, the vehicle must be
brought to a complete stop and the transmission placed in N
(Neutral).
Do not use 4H (4X4) or 4L (4X4 LOW) on dry, hard surfaced roads.
Doing so will produce excessive noise, increased tire wear and may
damage drive components. 4H (4X4) and 4L (4X4 LOW) are only
intended for consistently slippery or loose surfaces. Use of 4H (4X4) or
4L (4X4 LOW) on these surfaces may produce some noise (such as
occasional clunks) but will not damage drive components.
Your 4x4 features the heavy-duty Control Trac system which includes a
computer-operated transfer case. This unique system is interactive with
the road, continually monitoring and adjusting torque delivery to the
front and rear wheels to optimize vehicle control.
System indicator messages
The Control Trac system indicator messages display in the reconfigurable
telltale (RTT) location in the message center only under the following
conditions. If these messages display when driving in 2H, contact your
authorized dealer as soon as possible. Refer to Warning lights and
chimes in the Instrument Cluster chapter.
• 4X4 AUTO – displays when 4A is selected.
• 4X4 – displays when 4H is selected.
• 4X4 LOW – displays when 4L is selected.
2007 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)
Driving
273