2007 Ford Expedition Owner Guide 3rd Printing (Spanish) - Page 689

Driving 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. 275 2007 Expedition (exd) Owners Guide (post-2002-fmt) USA (fus)