Could a blown fuse cause 4wdhi-low and O/D flashing. Lincoln/Ford Mountaineer 98.

Recently the vehicle would jolt, moves awfully with gear noise, refuses to upshift, and binds on turns and flashes the "4wdhi- low and O/D" (overdrive.) Here's what happen.

When the car develops the symptoms I find and replace a blown cigarette lighter fuse. I remove an actuator motor and two speed sensors from transfer case for a test and pass, however, one of the sensor had magnetically attracted a buildup of metallic particles. I clean and install them and the symptom is gone. Was it the blown fuse??

Thanks.

Reply to
Tibur Waltson
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You're kidding, right?

Lurching, gear noise, binding and metallic shavings......yea, sounds like a fuse.

Reply to
Mark

Dirt and metal particles can adversly affect the operation of the Hall-effect speed sensors. When the GEM computer gets conflicting information from these sensors in '97 and later models it may first try to engage 4WD, but will shut the system down and flash the 4WD/4WD-Lo lights to indicate the problem. The system is also reset by disconnecting the battery. I suspect your cleaning was the likely fix.

=Vic= Bear Gap, PA

Reply to
Vic Klein

If the fuse blew:

A) find out why (fuses don't "just blow" without a reason) B) whatever was controlled by that fuse would have stopped working completely until the fuse was replaced.

Reply to
Bob M.

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