Re: VSS

["nacelp" <nacelp@bright.net>]

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@bright.net>
> > >>Reply-To: gmecm@diy-efi.org
> > >>To: <gmecm@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
> > >> >
> > >> >
> >________________________________________________________________________
> > >> > Get Your Private, Free E-mail from MSN Hotmail at
> >http://www.hotmail.com
> > >> >
> > >> >
> >
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> > >> >
> > >>
> >
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> > >
> >Thanks,
> >         Peter Hipson (founder, NEHOG)
> >         1995 White NA Hummer Wagon
>
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