My 1990 Ford Aerostar van decided last week to continually engage the
all-wheel drive... no warning light, no chattering, it's just always
engaged. I thought it might work it's way out, but to no avail.
I am not driving on the freeway while this is occuring, and am almost ready
to bite the bullet and take it in to a dealer, but was hoping that maybe
someone in this newsgroup may have had a similar experience or know the
answer to the problem.
Any and all input would be most appreciated.
OK, be nice to me now... lol
The aerostar AWD system actually has a warning light when the AWD is
activated? Which makes it sound like it's disengaged some times.
How does the system turn the AWD on and off?
The all transfer-case has a speed sensor watching the front axle and a speed
sensor watching the rear axle. When traction is good, both should show the same
speed. When there is a speed difference between the two ( like the rear wheels
spinning ), the module locks the clutch giving you four wheel drive and turns on
the light telling you that the front axle is engaged.. So what can cause a
different speed reading from the two sensors? Incorrect tire size on one axle
( on a vehicle with four wheel drive, tires should always be changed in sets of
four ). Flat tire. Open or shorted sensor.
Indeed! Thank you!
I should read up on this system. I have an AWD caravan (which has no
electronic sensing necessary for engaging the 4WD). But the AWD caravan is a
primarily front wheel drive, with secondary rear wheel drive vehicle.
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