944Hybrids: 924/944/968 and 928 V8 Conversions
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944 V8 Conversions

HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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How to wire the VSS into the GM PCM

+2
Hotrodz of Dallas
Jasonscottw
6 posters

944Hybrids: 924/944/968 and 928 V8 Conversions :: Technical Stuff (other than motors) :: Electrical Mods

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How to wire the VSS into the GM PCM Empty How to wire the VSS into the GM PCM

Post  Jasonscottw Fri Sep 02, 2016 12:03 am

So I have TPC's VSS kit installed, but I'm perplexed as to how to wire it into the PCM- which pin/port, and if there is a plug that I need to wire into those pins to mate up with the plug on the kit- thanks
Jasonscottw
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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  Hotrodz of Dallas Fri Sep 02, 2016 7:12 am

Jasonscottw wrote:So I have TPC's VSS kit installed, but I'm perplexed as to how to wire it into the PCM- which pin/port, and if there is a plug that I need to wire into those pins to mate up with the plug on the kit- thanks

What ecu and engine wire harness do you have? I can look and see what wires you need to attach to.
Hotrodz of Dallas
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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  Punisher948 Fri Sep 02, 2016 8:35 pm

Dear Jasonscottw,
Here is the Pinout for the VSS.

99 Camaro 5.7 Engine
Function-----Pin-----Circuit No.     PCM Termination
VSS LO-------A------822------------C2-20
VSS HI-------B-------821-----------C2-21

99 Corvette 5.7 Engine
Function-----Pin-----Circuit No.     PCM Termination
VSS LO-------A------401------------C2-20
VSS HI-------B-------400-----------C2-21

99 GMC Sierra 1500 5.3 Engine
Function-----Pin-----Circuit No.     PCM Termination
VSS LO-------A------822------------C2-20
VSS HI-------B-------821-----------C2-21

Punisher948

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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  Jasonscottw Sat Sep 03, 2016 12:09 am

Thank you!

Hotrodz, that would be awesome if you could confirm that info:

The computer:

Serv. No. 12586243
Hdw. No. 12583659

In researching the computer numbers I gather it may be from a later year express van, or a CTS??
Originally I thought it was from a 99 truck, but . . .

I hired a guy to do the final wiring cuz I had to go overseas for a bit- he didn't work out (at all) so now I'm trying to sort out his work, and also my work from a couple years ago Wink

And, any idea which wire coming off the VSS is high/lo?

Really appreciate the help-
Jasonscottw
Jasonscottw

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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  spence Sat Sep 03, 2016 5:11 am

http://www.lt1swap.com/2004gto_pcm_pinouts.htm

That pinout might help you figure things out...

"2004: Serv. No. 12586243 with Hwd. No. 12583659 - Mostly GTO and Express vans got this PCM, as well as Caddy CTS-V. MIGHT be in trucks"
spence
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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  Jasonscottw Mon Sep 05, 2016 9:02 pm

Thanks! Looks like I have a mismatched PCM/HARNESS . . .


Question:
The VSS harness/plug has two wires, but I have three options on the PCM:

-VSS low (pin 20)
-VSS hi (pin 21)
and
-VSS output (pin 50)

What do I do? And yes, I advanced searched this forum and the big 3 LS forums, and the only suggestion I found was to ignore the VSS hi, which doesn't make sense-
Also I'm unsure of what the VSS output would even do/function?

Thanks . . .
Jasonscottw
Jasonscottw

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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  sharkey Mon Sep 05, 2016 10:44 pm

never used the kit, but looking at a pic of one it has a yellow and black wire on the sensor. yellow would be high, black would be low. the vss output on the pcm is exactly that, a vehicle speed sensor output signal, it could be used to run an electronic speedo in some applications.

sharkey

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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  Rich L. Tue Sep 06, 2016 2:46 pm

The VSS output goes to the dash of the Camaro/Vette. The hi/lo go to the sensor but I don't know if polarity on the sensor matters.

Rich
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How to wire the VSS into the GM PCM Empty Re: How to wire the VSS into the GM PCM

Post  Jasonscottw Tue Sep 06, 2016 10:19 pm

Thanks all- now I just gotta re-pin 20 and 21.
For some reason the PCM is devoid of inputs at those locations-
Jasonscottw
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944Hybrids: 924/944/968 and 928 V8 Conversions :: Technical Stuff (other than motors) :: Electrical Mods

 
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