VSS

[black maj]

It's electronic now... but was originally mechanical...

but i have used the speedo cable drive output to drive the VSS and have used 
a late model leccy speedo... that came off the same car as the VSS...

>From: "nacelp" <nacelp at bright.net>
>Reply-To: gmecm at diy-efi.org
>To: <gmecm at diy-efi.org>
>Subject: Re: VSS
>Date: Fri, 21 Apr 2000 09:47:01 -0400
>
>
>Is the speedo mechanical or electric?.
>Your original post sounded like mechanical since you were talking speedo
>cable.   The VSS in a "cable" is just a chopper devise, and used by the ecm
>independently of the what the speedo does with the cable.
>Grumpy
>
>
>
>
> >Reverse the leads from the sender? That may do the trick.
> >
> >
> >
> > The VSS has only three wires.. a 12 volts in.... an earth.. and the
> > switched(pulsed) output...  this is why i cannot understand why it only
> > reads in one direction... as is should be a basic almost square wave
> > output?? or is it more like a hall effect distributer output??? a
>variation
> > in voltage, in which case it might be looking for a sharper rise??? or
> > something along those lines to determine direction???
> >
> >
> >
> > >
> > >At 02:57 AM 4/21/2000 GMT, you wrote:
> > > >
> > > >
> > > >
> > > >>From: "nacelp" <nacelp at bright.net>
> > > >>Reply-To: gmecm at diy-efi.org
> > > >>To: <gmecm at diy-efi.org>
> > > >>Subject: Re: VSS
> > > >>Date: Thu, 20 Apr 2000 22:28:40 -0400
> > > >>
> > > >>
> > > >>
> > > >>Sounds like the cable is spinning the wrong way.
> > > >>The speedo needle has no direct contact with the cable, and just
> > >"senses"
> > > >>speed (some use a spinning magnetic, and the needle is magnetic, and
> > >just
> > > >>tags along).
> > > >>The odometer only reads in one direction so you can't use a drill
>motor
> > >to
> > > >>unwind the showing mileage.
> > > >>grumpy
> > > >
> > > >Thanks,,
> > > >
> > > >Thats what i assumed was happening... so the only way to get the odo 
>to
> > >work
> > > >would be to gear the VSS to spin the other way??? I can't do it
> > > >electronically???  the speedo reads in both fowards and reverse
>gears...
> > > >
> > > >
> > > >
> > > >
> > > >>
> > > >> > Hi all... I have just added a VSS from a holden commodore and 
>since
> > > >> > it has
> > > >> > subed in the original speedo cable drive, i have also added the
> > > >> > commodore
> > > >> > dash... it all runs fine, except it reads a bit optimistic... (
> > > >> > which i plan
> > > >> > to fix with speedo gear drives) and that the odometer only works 
>in
> > > >> > reverse??? from what i can tell the VSS gives out a binary
>output...
> > > >> > ie
> > > >> > signal.. no signal... and shouldn't matter which way it is 
>spun...
> > > >> > any
> > > >> > suggestions??? and fixes?? i have thought about making a small
> > > >> > gearbox to
> > > >> > drive it the other direction... or maybe adding an inverter 
>circuit
> > > >> > into the
> > > >> > ouput line??
> > > >> >
> > > >> > regards...
> > > >> >
> > > >> > Ben
> > > >> >
> > > >> >
> > 
> >________________________________________________________________________
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> > > >
> > >Thanks,
> > >         Peter Hipson (founder, NEHOG)
> > >         1995 White NA Hummer Wagon
> >
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