2012 Ford F250 Super Duty Owner Guide 4th Printing - Page 284

Driving • On 2WD vehicles and 4WD vehicles in 2H (4X2) or 4H (4X4 High), the ELD will automatically disengage at speeds above 25 mph (40 km/h) and will automatically reengage at speeds below 19 mph (30 km/h). • On 4WD vehicles in 4L (4X4 Low), the ELD can be engaged at any speed and will not automatically disengage. Activating the electronic locking differential (ELD) For vehicles equipped with an electronic shift 4WD system: Pull the knob on the 4WD control toward you. The indicator light will display in the instrument cluster. For 2WD vehicles and vehicles equipped with a manual shift 4WD system: Turn the control to ON. The indicator light will display in the instrument cluster. light is displayed in the instrument cluster, both rear wheel Once the axle shafts will be locked together providing added traction. If the indicator light in the instrument cluster turns off, 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 the CHECK LOCKING DIFFERENTIAL message in the message center. See your authorized Ford dealer for assistance. Note: The ELD may have difficulty disengaging either by operator command or automatically if the driveline is under torque. If driving conditions allow, releasing the accelerator pedal or turning the steering wheel in the opposite direction may assist in disengagement. Note: The ELD is designed for off-road use only and is not intended for use on dry pavement. 284 2012 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)