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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.
Positions of the Control Trac system
The Control Trac system functions
in four modes:
• 2H (2WD) delivers power to the
rear wheels only. This is
appropriate for normal on-road
driving on dry pavement.
• 4A (4X4 AUTO) provides
electronic control four-wheel
drive with power delivered to all
four wheels, as required, for
increased traction. The RTT location in the message center will
display “4X4 AUTO” when this position is selected. This is appropriate
for all on-road driving conditions, such as dry road surfaces, wet
pavement, snow or gravel.
• 4H (4X4) provides electronically locked four-wheel drive power to
front and rear wheels. The RTT location in the message center will
display “4X4” when this position is selected. This position is not
recommended for use on dry pavement. This position is only intended
for severe winter or off-road conditions, such as deep snow, ice or
shallow sand.
2007 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)
Driving
275