mrvedit

Just to confirm:
You have checked continuity from the VSS to pins 20 and 21 of the red PCM connector?
The VSS was replaced and you even see a signal on the multimeter when the driveshaft turns?
Your speedometer still reads 0 mph?
Have you confirmed that the VSS wires not only have continuity but also are not grounded?

If all those are true, then that just leaves the PCM. Rare but possible.

BTW - My engine and trans are out or I would check what signal I get from the VSS.

14k

All is correct minus checking for grounding. How do Idk that?
My buddy's friend said that this happened on his gto and he turned the vss sensor about 90* and it fixed his problem.
Another local ls guy is telling me finishlibe could have put the wrong ring count in the tailshaft?

mrvedit

Check the resistance of each VSS wire to ground. As I mentioned, I measured one at 1 ohm (probably grounded within the PCM) and one at infinity which is then the real signal wire. If both read infinity, you have a wire break; if both read just a few ohms, the signal wire is shorted to ground.

There have been some mentions here about people installing the wrong VSS.

The wrong ring count would give you the wrong speed, not 0 mph.
Since you said that turning the driveshaft gave you a signal on the multimeter, that indicates the ring is there and that the VSS is responding to it.

Certainly you, but also I and others will be curious what this finally turns out to be. Be sure to post when you figure it out; I'm sure you will.

14k

Can you go into more detail about the wrong vss?

mrvedit

Sorry no; I read nearly every Transmission post , but cannot remember the details of every one months later; nor figure out which one it was.

Assuming most auto stores let you return unused items, why not just get another VSS from a different store and try it. If no difference, clean it and return the $25 part as unused; you certainly would not have damaged it with your test.

14k

I'm just going to run my own vss wires to eliminate wire breaks/grounds from this problem.

14k

Well I ran my own wires and nothing changed. I also turned the vss sensor like iv been told to try and nothing. Idk what else to do guys.

14k

Does everything look fine here? Chuck at flt told me to check to see if it was pushed on all the way.

mrvedit

Yes, the rotor/gear (?) for the VSS looks perfect.
Darn, it is soundling like a bad PCM; perhaps you can find one to borrow for a test.

14k

Why would it be a bad pcm when everything BUT the speedo work? Thing that bugs me most is why isn't the pcm reading mph if the sensor works and the new wires are good?

mrvedit

I don't have an answer for that, but if you have tried multiple VSSensors, replaced the wiring and confirmed the gear/rotor in the trans, what else can it be? You seem to know electrical work and have tested everything else.

The sensor puts out a tiny signal, just a few milli-volts which means the PCM has high sensitivity on that line. Perhaps static electricity blew it out when the VSS was disconnected. Sure that is far fetched, but you seem to have eliminated all other possibilities.

14k

If seems that way Ted. But there has to be something everyone is over looking.

14k

Well problem solved so far. I tested while up on jacks and my speedo is working. Thanks a lot for all the ideas. Now to put some miles on my ss3600 and then see how she does WOT.

mrvedit

Glad you figured it out! A faulty connector.
In the future I will remind people to check not only the wires, but also the connector.
Enjoy!

14k

Ive got all gears except when I let off my car wants to die. Just needs a retune yes?

RevGTO

iTrader: (12)

I think so. After my first converter install, my idle would drop very low when coming to a stop, especially with the A/C on. I bumped up idle speed 100rpm, changed some misfire settings, and advanced some spark to compensate.

IIRC, it's the difference in inertia between the stock converter and aftermarket that confuses the PCM and causes this.

14k

I didn't have a stock converter ihad a 3200 circle d and didn't know It.