Re: VSS

["Peter D. Hipson" <mail@darkstar.mv.com>]

Oops, got me. I thought it might be a coil type sender with a diode to stop
the odo in reverse. Do you get a waveform from the sender?

At 01:17 PM 4/21/2000 GMT, you wrote:
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>>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.
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>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???
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>>
>>At 02:57 AM 4/21/2000 GMT, you wrote:
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>> >
>> >
>> >>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
>> >> >
>> >> > 

>> >> >
>> >> >
>>
>>--------------------------------------------------------------------------

>> >> >
>> >>
>>

>> >>
>> >

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>> >
>> >
>> >
>>Thanks,
>>         Peter Hipson (founder, NEHOG)
>>         1995 White NA Hummer Wagon

>>
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Thanks, 
        Peter Hipson (founder, NEHOG)
        1995 White NA Hummer Wagon