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.
•
4L (4X4 LOW)
provides electronically locked four-wheel drive when
extra power at reduced speeds is required. The RTT location in the
message center will display “4X4 LOW” when this position is selected.
This position is not recommended for use on dry pavement. Use this
position for off-road low-speed operation or when extra power is
required, such as climbing steep grades, going through deep sand or
pulling a boat out of the water.
Note:
If your vehicle is equipped with AdvanceTrac
威
with RSC, the
AdvanceTrac
威
with RSC system will automatically turn off the stability
enhancement feature when you shift the Control Trac four-wheel drive
system into 4L (4X4 LOW). The brake traction enhancement feature will
still be enabled.
2008 Expedition
(exd)
Owners Guide (post-2002-fmt)
USA
(fus)
Driving
291
