Elaine,
not work, do tell what makes you think it dont work (a lamp) or tires slipping or dead tires. (by tires mean that and traction)??????????
what mode fails, of the many, and where.???????
first off, we dont know what your tires are touching.
on road, or off road. pavement or ICE or snow.
that matters big time . (you read manual and match MODE to Road)
your lost operators guide explains all that, right?
eg: how and when to use, 4wd, its all there. I promise.
ControlTrac 4-wheel-drive system
here are the mode. which one , gives you problems.
quote ford with comments.
What are the modes, and how do they differ? (note this is the operational behavior of a 2008 Ford Expedition. Newer and older Expeditions will vary only slightly)
•
2H 2-wheel-drive with
high range gearing (1.00:1) Rear-wheel-drive capability,
2-wheel electronic traction control system is enabled
•
4A 4-wheel-drive Auto with
high range gearing (1.00:1) Full-time
all-wheel-drive capability, ((best on pavement or any time)
Electronically adjusted torque split to front & rear wheels, Electronically variable center differential,
Front driveshaft & rear primary driveshaft allowed rotational speed difference,
4-wheel electronic traction control system is enabled
•
4H 4-wheel-drive with
high range gearing (1.00:1) Part-time 4-wheel-drive capability,
(not for dry pavement EVER) Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,
Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,
4-wheel electronic traction control system is enabled
•
4L 4-wheel-drive with
low range gearing (2.64:1) Part-time 4-wheel-drive capability,
(off road usage, mostly) Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,
Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,
4-wheel electronic traction control system is enabled, ESC and RSC are disabled
In 4A mode the center differential is electronically-controlled and rear drive wheel bias. The
on-board computer monitors for any sign of rear drive wheel slip (loss of traction)
If loss of traction is detected, the center differential is told to send a share of the engine\'s torque to the front drive wheels. It will not let the front driveshaft turn at the same speed as the
rear driveshaft.
What about traction management? 1997-2002 model Ford Expeditions offered an optional limited-slip rear differential (LSD). A conventional open rear differential was standard along with the conventional open front differential and the electronic locking center differential.
comment with out LSD, one tire can spin, on say ice.
but the other 3 tires dont, in full time.
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