Question about 2006 Ford F-150
ABS system is self monitoring.It will perform a peliminary check on itself when you first turn the key on,thats why the light stays on for about 3 secs when you first start it up. It will also perform another check on itself after you reach speed of around 8-12 mph.
For it to come on while driving it must see something wrong at the wheel speed sensors that it knows can not be correct so it is shutting itself down. It has a digital wheel sensor in each wheel that it uses to compare side to side readings. If it sees one wheel spinning faster than the other it thinks one of the wheels is locking up and it activates. Now it could be one of the wheel speed sensors is starting to go bad or it may be something as simple as one of the tires low on air. I would check all of the air pressures in the tires first to make sure the are equal and if that is ok then I would have some one hook a scan tool to it and see what trouble codes are stored in the memory of the ABS module.
Posted on Feb 27, 2009
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