Question about 1994 BMW 3 Series
The fuel pump will not come on when switch is turned on. Also we have changed the dme and still nothing. We also checked the DME relay and its good even changed it.
I would check the voltage the fuel pump first. They do go bad. You may be able to access it from under the back seat. Let me know what you find out and I'll try and help.
Posted on Feb 11, 2013
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Posted on Jan 02, 2017
ok if these are error codes for O2 sensors then don't worry about the post-cat sensor. the pre-cat may affect gas mileage slightly, but won't stop your car. however, my experience says the DME or ECU what ever you want to call it can giive false readings if it gets wet..
are there any performance issue?
you might check the ecu/dme read below
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
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