pulled codes, dead ecu?

[isham-research.freeserve.co.uk at pop.pol.net.uk]

>   First off, it *seemed* to me the computer would
> provide a 1 before each code. . ?  Is this so?

No, but I've heard of one ECU that gave a shorter 'start' pulse than
normal.

>   Because it seems I got a 12141, which of course is 5
> digits and does not exist, but 2141 makes sense.  And
> a 12144, which of course could be 2144.  Both of these
> codes are knock sensor related.

>   The third and final code was 1111.  Does this make
> sense?  Would a "defective" ECU provide codes before
> telling me it's dead?  I suppose this could explain an
> intermittent no start. . ?

Yes, I saw this last Friday on a MAC12D.  In my case, it was incompetent
'chipping' - whoever had patched the tables had forgotten (or didn't
know how) to recalculate the checksum.

>   This is an early '89 w/fuse on top of fuel pump
> relay.  Where is the ECU located in this car?

Left side of left footwell.  Pull the door trim away - one screw hidden
in the carpet at the base of the panel.

--
 Phil Payne
 http://www.isham-research.freeserve.co.uk/quattro
 Phone +44 7785 302803   Fax: +44 7785 309674