Still having issues with the VSS setup on my TPI Miata.
Need a little help if anyone has the answers.
First off tested everything I could, have AC voltage coming from VSS when moving, buffer wired in correctly, is brand new, but get constant battery voltage out of all of the outputs on the buffer including the VSS input 12volt + shows up when I turn the key on. Is this right? Could I have a factory flawed part? I soldered my wires to the buffer board as I have no access to the plug in for it, could that have damaged it in some way?
I need to get this working, I am almost ready to go to a speedometer setup and a Jags that Run 2k PPm square wave generator. Any thoughts ideas or anyhting that I am overlooking? Anyone have time to voltmeter the buffer and tell me what they see at each terminal.? I just need this to work, I am ready to buy whatever to get it working, I need to get this car on the road. Please help me out if you know what to check? Buffer has good solid ground, god solid IGN power, good solid connections for everything, all new 14ga automotive wire loomed for the sensor buffer etc. All good quality everything, All connections soldred etc.. Something either wrong or not functioning properly. Ohmed all wires and all are just fine from end to end.
Maybe a bad buffer module? Any way to test this thing> Anyone have a fatory manual that can look and see if there is a testing procedure for the "buffer module" would most likely have to be a Firebird to have the buffer and electronic speedo?
Thank you in advamnce for your help.

 

What VSS is installed? There are two different types in use on ThirdGens. If you are using an older optical sensor, the output signal from the sensor should be mostly a square wave. If you are using a PM pulse generator, the output will be more sinusoidal.

A p/n for the VSS and p/n for the buffer box would be helpful to see if they are compatible.

 

I am using the firebird 4k ppm T5 gear driven speed sensor.
The buffer box is part #
25071437
The sensor is the T5 one as seen in the Jags that run TPI conversion book
page 12-4 The ones used on camaros and firechickens with the electronic speedo.

 

That's the newer version VSS with a tachogenerator pulse output. I'd have to look into the P/N on the buffer to make sure it's correct for that VSS.

 

Thank you for helping, it seems to be hard to get info here on this?
For knowledge sake, would the 730 ECU read the output directly of that sensor? I may go to spped density down the road if I have too many more road blocks with packaging, tuning, and getting the bugs worked out with the MAF setup.
But I am still going to try and use the MAF for now so am still seeking answers on how to make my setup work?> If it is a buffer with a different part# etc, then I am all for buying it. Just need to knwo what to get or what I am doing wrong?
Thank You again.

 

The '730 ECM will read the VSS signal directly. The '165 ECM needs a buffer for a 2,002 PPM input The cruise module will probably also need the buffer. The speedometer may take the 4,000 PPM input directly, depending upon what it is.