OBD Crap

[jdbubb at ix.netcom.com (Dan Bubb)]

Ran across something like this on my nephew's 97 Passat.
One thing wrong that gave a whole bunch of different error codes.
In his case it was a bad fuel pump relay. But there were a million little things powered through
that relay and they all generated an error code.
In the end, for me at least, the only way to narrow it down was to sit and stare at the schematics
until I saw the common point.
Probably not much help.
>From what you've said I'd concentrate on the engine speed signal. If that isn't working, the engine
sure as hell isn't going to run.
Dan


Sent: Sunday, November 14, 2004 6:25 PM
Subject: OBD Crap


> Okay, so my Mother's A4 Jetta quit running today.  So I give it the once
> over nothing looks really out of place.  I trek down to the local parts
> store to rent a code scanner.  I tcomes back with a Miss-fire on #4 and No
> signal fron Eng speed cir.  But then it rattles off a whole slew of "Factory
> Only" codes.  GRRRRRReat.  F'n VW.  So I do a little digging on the net and
> find that the other codes are Injector ground shorts and Tank Vent sort to
> ground, and Evap control short to ground.  WTF!  That leads me to believe
> that all the grounds took a shit over night.  Any input?
>
> Thanks,
>
> Erik
>