2011 Ford Expedition Owner Guide 1st Printing - Page 264

Driving Servicing • If the image comes on while the vehicle is not in R (Reverse), have the system inspected by your authorized dealer. • If the image is not clear, then check if there is anything covering the lens such as dirt, mud, ice, snow, etc. If the image is still not clear after cleaning, have your system inspected by your authorized dealer. CONTROL TRAC FOUR-WHEEL DRIVE (4X4) OPERATION (IF EQUIPPED) WARNING: 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 faster than 3 mph (5 km/h), 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 stopped or moving slower than 3 mph (5 km/h) and the transmission placed in N (Neutral). See the Message center in the Instrument Cluster section to complete the 4L shift if either shift condition is not met. 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. 264 2011 Expedition (exd) Owners Guide, 1st Printing USA (fus)