2002 Ford Expedition Owner Guide 1st Printing - Page 167

Driving FOUR-WHEEL DRIVE (4WD) OPERATION (IF EQUIPPED) For important information regarding safe operation of this type of vehicle, see Preparing to drive your vehicle in this chapter. When Four-wheel drive (4WD) is engaged, power is supplied to all four wheels through a transfer case. 4WD power can be selected when additional driving power is desired. If equipped with the Electronic Shift 4WD System, and the instrument panel control is moved to 4WD Low while the vehicle is moving, the system will not engage and no damage will occur to the 4WD system. Before 4WD Low can be engaged, the vehicle must be at a complete stop with the brake pedal depressed and the transmission in N (Neutral). 4H or 4L operation is not recommended on dry pavement. Doing so could result in difficult disengagement of the transfer case, damage to the transfer case, increased tire wear, decreased fuel economy and difficulty turning. Control-Trac automatic four-wheel drive system (if equipped) 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. Positions of the Control-Trac system The Control-Trac A4WD system 4H functions in three modes: A4WD 4L • A4WD position delivers power to the rear axle. If the rear wheels lose traction, power will be automatically delivered to the front axle to maintain traction throughout the slippery condition. • 4H position provides mechanically locked four-wheel drive power delivery to front and rear axles. • 4L position provides mechanically locked four-wheel drive when above average power at reduced speeds is required. 167