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Re: VSS





From: "Peter D. Hipson" <mail@darkstar.mv.com>
Reply-To: gmecm@diy-efi.org
To: gmecm@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@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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