[s-cars] Things that go bump in the night.

[Robert Myers]

Kent,

There is no basic difference between the OEM AAN coilpack operation 
and the 1.8t coil operation.  Constant +12 volt (nominal) is supplied 
to the primary.  The other end of the primary coil is shorted to 
ground by the PSO upon the signal from the ECU.  This produces a 
large current surge in the primary which inductively produces a high 
voltage spike in the secondary and fires the plug.  The only 
difference is that the AAN PSO is a three channel device which 
handles either three or two primary coils at one per channel.  The 
PSO for the 1.8t coil is built into the coil itself.  The operation 
is identical only the physical conformation and the locations are 
different.  There should be absolutely no difference in the ECU/coil 
interactions between the two types.  VAG-COM should see identically 
the same information in either case.

At 08:15 AM 6/17/2006, Kent McLean wrote:
>Robert Myers wrote:
> > Monday evening while driving home from Huntington (~110 miles)
> > the engine ('95.5 S6 AAN-RS2ed w/ 1.8t coil conversion + other
> > goodies) bucked once.  It felt like the ignition just cut out
> > very briefly -
>...
> > hooked up VAG-COM and read codes - none found.
>
>Dumb coil conversion question:  is the coil conversion tied
>into the ECU codes?  That is, if one of the converted coils
>goes bad, can the diagnostics detect it the way it would if
>it was a POS gone bad?
>
>--
>Kent McLean
>'94 100 S Avant, "Moody"
>'89 200 TQ, "Bad Puppy" up in smoke
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