power lock pump 4kq help

[Huw Powell]

> >It is my belief that the pump runs on a timer - there is no vacuum or
> >pressure threshold at which they cut out.  You might possibly not be
> >letting it run all the way to end of the "lock" cycle before trying to
> >"unlock," but that is unlikely, I only mention it as a possibility.
> >
> >
>
> Actually they will run much longer if there's a vacuum leak, half a
> minute or so.

You may be right - I am shooting from the hip on that one (as I suspect
most are) - the thing that matters is to experiment and test the theory,
or to find corroborating information in the Bentley description.  it
certainly would make sense for the unit to have a pressure threshold
cutoff, as well as a timer, although it is not critically important to
know if they do in order to troubleshoot the system.

a few minutes playing a spare pump, pressure accumulator and a 2A 12v
power supply didn't help much.  I'll try again some time with more than
one pump and a beefier supply...

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/