According to my Bentley for 86-92 Jetta,Golf, and GTI, the Digifant II
has a throttle position switch, and no knock sensor like the Vanagon.
The Digifant II also has a Hall Ignition Control Unit.  Digifant I has
a throttle position potentiometer, an ignition coil power stage, and a
knock sensor set up.  I believe the Digifant I system was used for the
California cars in 1991, and 1992.

rob
a.k.a. old kayaker
1987 Wolfsburg Vanagon
1991 Jetta (with Digifant I)

On Tue, Jun 12, 2012 at 7:11 PM, Scott Daniel - Turbovans
<scottdaniel@turbovans.com> wrote:
> On 6/12/2012 9:16 AM, neil n wrote:
>>
>> Searching again, it seems I shouldn't have quoted Wiki.
>
>
> I glanced over the Wiki entry for Digifant.
> The author is not very Vanagon focused ...but more Golf/jetta focused.
> he talks of the ECU havinga knock sensor as an input ..
> our vanagons of course do not.
> I could-should dig out a jetta ecu I have and see if it says 'Digifant
> II' on it ..
> wouldn't surprise me if it does.
>
> In our vanagons though ..it's plane ole Digifant to me. � Bentley too I
> think.
> the author also talks about the 'Air Control Valve (IACV)' �as something
> the ECM conotols.
> As if that valve was controlled by the �ECU in Vanagon in our Digifant
> systems.
> It's not mainly of course..
> but rather by the Control Unit behind the right tail light.
> it's just not a vanagon-digifant focused article really.
> Better than nothing if one has no idea what digifant is ..
> but not very useful to use Vanagonauts.
> Not very well �written in my opinion, kinda jumps around.
> Also strikes me that the author is more into the digital functioning of
> the ECU guts more, �than into the real world of dirty engines that don't
> run right due to Digifant System parts, signals, or wires that are not
> behaving. Like a bit theoretical and not 'in the trenches of the real
> automotive world.'
> Whatever ...it's better than nothing let's say. �Just doesn't fit
> vanagon digifant that well.
>
> scott