FORD 2011 F-150 v.3 - Manual (Page 318)

Activating the electronic locking differential (ELD)
The ELD can be turned on by
pulling the knob on the 4WD control
toward you while the control is in
either 4H (4X4 high) or 4L (4X4
low) mode.
Once the knob is pulled, the
light located on the control will
blink for approximately two seconds
and then it will remain solid. The
indicator light will also display in
the message center.
Once the light on the control
remains solid and the indicator
light is displayed in the message
center, both rear wheel axle shafts
will be locked together providing
added traction.
If the light blinks for 10 seconds, then turns off, and the indicator
light in the message center 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 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.
Driving off-road with truck and utility vehicles
4WD vehicles are specially equipped for driving on sand, snow, mud and
rough terrain and have operating characteristics that are somewhat
different from conventional vehicles, both on and off the road.
Your vehicle may be equipped with a front air dam that can become
damaged (due to reduced ground clearance) when taking your vehicle
off-road. This air dam can be taken off by removing two bolts.
For vehicles equipped with a 3.5L Ecoboost™ engine:
Your vehicle is equipped with an underbody transmission shield and
brackets that may become damaged (due to reduced ground clearance)
Driving
318
2011 F-150 (f12)
Owners Guide, 3rd Printing
USA (fus)