FORD 2011 Edge v.1 - Manual (Page 282)

All components of the AWD system are sealed for life and require no
maintenance.
Note: When an AWD system fault is present, the warning CHECK AWD
will display in the message center. The AWD system is not functioning
correctly and defaulted to front-wheel drive. When this warning is
displayed, have your vehicle serviced at an authorized dealer
If your vehicle is equipped with AWD, a spare tire of a different size
other than the tire provided should never be used. If the spare tire is
installed, the AWD system may disable automatically and enter
front-wheel drive only mode to protect driveline components. This
condition may be indicated by an AWD OFF message in the message
center (see Message center section in the Instrument Cluster chapter
for more information). If there is an AWD OFF message in the message
center from using the spare tire, this indicator should turn off after
reinstalling the repaired or replaced normal road tire and driving a short
distance. It is recommended to reinstall the repaired or replaced road
tire as soon as possible. Major dissimilar tire sizes between the front and
rear axles could cause the AWD system to stop functioning and default
to front-wheel drive or damage the AWD system.
Note: The AWD OFF message may also be displayed in the message
center if the AWD system has overheated and defaulted to front-wheel
drive. This condition may occur if the vehicle was operated in extreme
conditions with excessive wheel slip, such as deep sand. To resume
normal AWD function as soon as possible, stop the vehicle in a safe
location and allow it to idle. The AWD OFF message will turn off when
the system cools and normal AWD function returns.
Note: The AWD feature gives your vehicle some limited off-road
capabilities in which driving surfaces are relatively level, obstruction-free
and otherwise similar to normal on-road driving conditions. Operating
your vehicle under other than those conditions could subject the vehicle
to excessive stress which might result in damage which is not covered
under your warranty.
Driving off-highway with AWD vehicles
AWD vehicles are equipped for driving on sand, snow, mud and rough
roads and have operating characteristics that are somewhat different
from conventional vehicles, both on and off the highway.
When driving at slow speeds off-highway under high outside
temperatures, use L (Low) gear when possible. L (Low) gear operation
will maximize the engine and transmission cooling capability.
Driving
282
2011 Edge (edg)
Owners Guide, 1st Printing
USA (fus)