OBD ll 
Speedo Hookup
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On The Tree
Joined: Aug 2007
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Speedo Hookup I am in the process of doing up my wiring and hooking up my VDO Speedometer but am unsure of how to hook it up. Here is the PDF of hooking up the speedo, I would like to hook it up to the VSS wire out of the ECM, is this possible.
On The Tree
Joined: Jul 2004
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From: Stockholm, Sweden
This question has been up several times before, do a search and you'll find a lot of info.
In general it is best to hook it up directly to the speedo output on the trans. It will give a sinewave. You will also need a pullup resistor of if the speedo has such a function built-in you have to use that.
The signal from the PCM can also beused if the Speedo can handle a square wave signal. Some can and some can't.
The PCM also need VSS input for different task, especially if you run an auto.
Jan
In general it is best to hook it up directly to the speedo output on the trans. It will give a sinewave. You will also need a pullup resistor of if the speedo has such a function built-in you have to use that.
The signal from the PCM can also beused if the Speedo can handle a square wave signal. Some can and some can't.
The PCM also need VSS input for different task, especially if you run an auto.
Jan
Thread Starter
On The Tree
Joined: Aug 2007
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Thanks, That is pretty much what I was thinking but I didnt want to burn anything out anything, I will try and give the mfr a call tomorrow and see if what they have to say.
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Verdad Gallardo Joined: Sep 2004
Posts: 3,147
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From: Downers Grove, IL
Since it sounds like the cruise setup is a few years old I would guess that it is looking for a square wave DC signal since that was used before the newer sine wave VSS`s came out.
