Question about 2004 BMW X3 2.5i
Speedometer not working
Posted by Anonymous on
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Posted on Jan 02, 2017
bad sensors are less common than a faulty ECU.
the OBDII readers they use to trace problems in the car are read through the ecu, not testing the sensor itself, but the reading of it from the euc.
my bmw experiences leads me to the wet eci box.
the ecu compartment is under the windshield on the passenger side on E36
you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
the bottom side of the circuit board gets wet and starts corrosion.
remove the ecu, take the bottom plate off, clean the bottom of the circuit
board with alcohol and a soft tooth brush.
you should be able to see the signs of corrosion or conductive build up.
this gunk bridges solder points doing all sort s of wierd things to your
car, including false sensor readings from asc/abs controllers and other
all the way to engine failure and worst case burnt and shorted wiring
I'm on my 3rd ecu, took me and the repair boys a few years to figure this
BTW: i would get that ecu mounted above that flat surface, use some sort
of standoff to raise it so that it is not laying in the wet.
Posted on Feb 07, 2010
Probably the Abs Module.Are the ABS, Brake,Traction Indicators on? You may call or e-mail me @ firstname.lastname@example.org or 318-289-4999
Posted on Feb 22, 2010
sounds like a broken cable i would recomend taking it to a dealer and having them check and replace it if thats truly the problem they can get it in and out faster
Posted on Jun 30, 2012
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