2006 BMW 325i electric water pump
[2006 BMW 325i, Engine/Propulsion Waveform] [2006
BMW 325i, Engine/Propulsion Waveform] [2006 BMW 325i,
Engine/Propulsion Waveform] Hey everyone. I had a 2006 BMW
325i come in with a code 2E81 "Electric water pump, speed
difference". These electric water pumps are a common failure
and we quoted the job to the customer who said it will have
to wait until after christmas. Hopefully this thing will
come back for the new pump and I can get a known good wave
of a new pump, but until then I wanted to share these
waveforms and see if anyone had any inputs on what was
happening here. I amp clamped the power supply to this pump
and activated it with a scan tool, expecting to see a 6 or 8
commutator waveform that I could calculate the rpm's of.
Instead, I got a waveform with ramps that look more like
injector ramps than commutator humps, and instead of the
normal in rush of amperage that we see on a commutator pump,
I had a wave that started out flatline and slowly grew in
amplitude until it peaked at about 16-18A. The other thing
that really bothered me was that after every other ramp, the
wave dropped into negative amperage, as much as -8A in one
capture. I quickly removed my amp clamp from the wire and
re-zeroed it with no change in the waveform at all.
Mike Harlan
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Vehicle Data2006 BMW 325i 3.0L
|
Vehicle Data
2006 BMW 325i 3.0L
Engine | 3.0 L |
Trans | 6-speed Automatic (Electronic) |