[V8] Who Works on ECUs?

[dsaad at icehouse.net]

Two things come to mind Dave:

First, just for giggles you can try to scrub your dead circuit boards with a
soft bristle brush and hot soapy water. Finish off with lots of clean hot water
and then bake (low heat until golden brown :-) it or dry good with a hair dryer.

If it works, you have a spare ECU. If it doesn't, you have a clean ECU.

Next, you might have a good parts ECU. The driver device for the ISV is probably
easy to identify and replace - even if it is surface mount.

Dave



Quoting "Coleman, David" <David.Coleman at blackrock.com>:

> I should second Steve's statement about the complexity of changing chips
> in these motronic ECUs.  My 5-speed ECU got drenched and was, as far as
> I was concerned, unfixable.  Luckily Audi Connection hooked me up with a
> replacement for a great price, and I was off and running.   But just for
> the halibut I dis/re-assembled my old one, and I wouldn't do it again --
> not on one I plan to actually use.
>
> After all the trouble of finding a fix for yours (not to mention the
> unsure-ness of whether or not it's actually fixed right), I think the
> safe money is with a used one.  And if a 5-speed version is unavailable,
> perhaps AC or someone can put you on a "waiting list", and use the auto
> version in the interim.   I believe Keith et al has made the
> determination that there is different mapping between the 5-speed and
> automatic ECUs, and it's possible (probable?) that that's where your
> high idle comes from.
>
> DaveC.
>
>
>
>
> > ... when you do get to swapping chips, make sure you know how
> > to get the circuit boards apart ... the upper circuit board
> > holds one row of pins for the external interface connector,
> > and you've got to do some fancy footwork to disengage the
> > pins from the connector ...
> >
> > Steve B
> > San Jose, CA (USA)
> >
> > ----- Original Message -----
> > Bad back has forced me to take it into a reputable shop (not
> > sure which hurts more), so I don't have all answers at my
> > fingertips.  They did look for vacuum leaks and checked the
> > cruise control.  Accelerator cable was binding slightly and
> > has been replaced.  The ISV is new; old one was throwing a
> > code (short to ground) and had about 70k miles on it, and
> > cleaning had no effect.  Speed sensor is also new.
> >
> > I'll ask whether idle changed when unplugging ISV but assume
> > that it did.
> > It really sounds like when the speed sensor input gets
> > screwed up, the ECU clamps the idle output.
> >
> > So does anyone know who works on these (my soldering skills
> > are mediocre, and the shop has the car) or what is a
> > reasonable price from a yard?  Sounds like a computer from an
> > automatic should be ok, and I should be able to swap the chips.
> >
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