VSS Not communicating. Need wire diagram to check signal

[Daniel Linnett]

This is got 04 GTO. Figured crazy paul or soneone may have diagrams.

Does anyone have a wiring diagram of where the vss speed sensor goes? The computer is not getting signal to shift. We can force the car to change gears with hp tuners but obviously that is not acceptable on the street. Any help is appreciated.


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[Greg@PacePerformance]

Vehicle Speed Sensor (VSS)
Right rear of the transaxle attached to the tailshaft housing

Vehicle Speed Sensor – Automatic Transmission C1
Connector Part Information
•7223–9569–30
•2-Way Female (BK)

Pin - Wire Color - Circuit No. - Function
A - BU/WH - 1230 - AT ISS High Signal
B - BN/RD - 1231 - AT ISS Low Signal

Yes I know it says ISS but I'm not sure why.

VSS wires directly to PCM it looks like
GTO VSS.jpg

[Daniel Linnett]

I'll give to shop. Thanks so much


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[Daniel Linnett]

Well we still can't get the dumb thing to communicate. The vss is getting power but I guess the PCM is not reading? Could computer be bad? Would suck because then I need a new computer and have to pay a dealer with tech 2 to reprogram to bcm and Tcm


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[427g8gt]

Ur looking for a ground signal

[Daniel Linnett]

We found grounds too. I'm not there working on it. Only getting second hand info.


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[427g8gt]

It should be a ground pulse signal

[Daniel Linnett]

David I'm about to trailer it to your shop lol


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[427g8gt]

The ring in trans rotates like an abs ring does u then in turn get a pulse signal do they have a scanner to read ur speed outputs like voltage ground and reference signals