How Do I Troubleshoot a 2006 F150 Truck That Will Not Go Into Four- Wheel Drive?
Some 2006 Ford F-150 pickup trucks were sold with four-wheel drive transmissions that supply power to all four wheels when needed. The four-wheel drive system isn't in use all the time, and Ford only recommends using it under certain pavement conditions since drive-train damage can occur on dry pavement. In addition, shifting to and from four-wheel drive only can be obtained under certain conditions. Troubleshooting can be accomplished by following a few simple steps.
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Instructions
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Engage the four-wheel drive low gears when the correct speed is obtained. Lower the vehicle's speed to below 3 mph before engaging four-wheel drive "low" if the vehicle is equipped with the electronic shift "4WD" system or the manual system. You can tell if the system is electronic because the it is operated with dashboard controls rather than a lever near the gear shift.
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Make the shift into four-wheel drive "low" while coasting at 3 mph if the truck won't go into four-wheel drive "low" when stopped.
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Move the lever on a manual system at speeds up to 55 mph, to shift between two-wheel drive "high" and four-wheel drive "high" if the truck won't go into four-wheel drive. Don't attempt the shift at speeds greater than 55 mph.
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Wait for the ambient temperature to go above 32 degrees if you want to make the shift at speeds up to 55 mph. If the ambient temperature is bellow freezing, make the shift at 45 mph or lower.
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References
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