2008 Ford Expedition Owner Guide 1st Printing - Page 291

Driving 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௡ with RSC, the AdvanceTrac௡ 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. 291 2008 Expedition (exd) Owners Guide (post-2002-fmt) USA (fus)