Re: ECU diagnostic reliability?

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <f899a3ec.362260f9@aol.com> LOACESQ@aol.com writes:

> does anybody have a good sense of the reliability and accuracy of the ECU
> self-diagnostics?  Has anybody experienced any false positives?

I've always been amused by the fact that you can pull multiple codes,
but the book says to fix the first one it gives you and then re-test.

This _does_ seem to work.  The worst car I've ever seen was James
Gibson's MB - the more wiring problems we fixed, the more codes it
gave us.  I think we had all combinations but two.  Basically, the
thing was right all down the line.

The first thing it flashed at us was "Inlet air temperature sender".

Fine - it wasn't even connected.  Without it hooked up, the ECU was
simply not trying anything adventurous - once it could see it again,
it tried some boost and then stored another four codes or so.

I think if the code can deal with a situation like that, it's pretty
well bomb-proof.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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