VSS

[black maj]

>From: "Peter D. Hipson" <mail at darkstar.mv.com>
>Reply-To: gmecm at diy-efi.org
>To: gmecm at diy-efi.org
>Subject: Re: VSS
>Date: Fri, 21 Apr 2000 08:49:10 -0400
>
>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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> >> >
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> >
>Thanks,
>         Peter Hipson (founder, NEHOG)
>         1995 White NA Hummer Wagon
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