2012 Ford F150 Owner Guide 2nd Printing - Page 327

Driving Activating the electronic locking differential (ELD) The ELD can be turned on by pulling the 4WD control knob toward you (4x4 vehicles) or by turning the ELD control knob from OFF to ON (4x2 vehicles). Once the indicator light is displayed in the message center, both rear wheel axle shafts will be locked together providing added traction. If the indicator does not come on, or the indicator turns off while driving, one of the following has occurred: • The vehicle speed is too high. • The left and right rear wheel speed difference is too high during an engagement attempt. • The system has malfunctioned and will be accompanied by a CHECK LOCKING DIFFERENTIAL message in the message center. Note: If the ELD has difficulty disengaging, release the accelerator pedal and turn the steering wheel in the opposite direction while rolling. Basic operating principles Do not use 4WD on dry, hard surfaced roads. Doing so will produce excessive noise and vibration and increase tire wear. 4WD modes are only intended for consistently slippery or loose surfaces. Parking On 4WD vehicles, when the transfer case is in the N (Neutral) position for recreational towing purposes, the engine and transmission are disconnected from the rest of the driveline. Therefore, the vehicle is free to roll even if the automatic transmission is in P (Park) or the manual transmission is in gear. Do not leave the vehicle unattended with the transfer case in the N (Neutral) position. Always set the parking brake fully and turn off the ignition when leaving the vehicle. Refer to Recreational towing for more information. 327 2012 F-150 (f12) Owners Guide, 2nd Printing USA (fus)