Speedometer Broken

[5NINE!]

So the break in the wire is suspected to be from the plug at the passenger side to the gauge. Do you have a diagram of the pins for the gauge wire connector? I can't remove the connector from behind the gauge cluster because it seems to be a part of the entire dash assembly, and I want to know what pins the two vss wires go to so I can narrow the search and possibly jump a wire from the pin to the wires that I know are good.

[birdie2000]

If the break seems to be between the pcm and the gauge cluster, then you don't really need to do anything with the VSS wires if you've tested their continuity and it's good. I'm not sure, but I would suspect that you can't run a wire directly from the VSS to the cluster bypassing the PCM to see if it works, I would assume the PCM modifies the signal since it corrects for gear ratio.

The second pic in my first post above shows the cluster connector you're looking for. You're looking for pin B12 according to those diagrams. Not sure if that's the view on the vehicle side or the cluster side of the connector, but just note the orientation of the connector and count to find it. They're usually labeled on the connector too if you can see it. Also, the wire you're looking for is dark green with a white stripe down it.

Here's the connector view for the C220 connector in the passenger kick panel. You're looking for pin G and again it's the dark green wire with a white stripe down it. Just noticed there's apparently two wires of this color in this connector (kinda odd) so make sure you have the right one.

97 Camaro 3.8 C220 Connector View.jpg

[5NINE!]

Kind of a dumb question, but how exactly would you check for continuity? I can reach from the dash plug to the kick panel plug with the tester, but I'm betting that I didn't test Properly for the other half of the wires.

[birdie2000]

You need to test between the cluster connector and c220, then from the other side of c220 to the associated pin on the pcm connector. Those will tell you if there's a break between the speedo and the pcm.

Also, you need to check the two wires between the vss and the pcm. If the leads on the multimeter won't reach you'll have to figure out a way to properly shove a piece of wire into the pin on one of the connectors to extend it, however if this shows a break I wouldn't rely on it in case the extension wire doesn't make a proper connection. With a helper you shouldn't have a problem with reaching these connectors as long as your multimeter doesn't have obscenely short leads.

If you're ever out near Livonia I'd be happy to help you test the wires if needed.

[5NINE!]

I assume the PCM wire is also green with a white stripe...

[birdie2000]

According to the diagram, yes, although there could be more than one. From the diagram it looks to be connector C1, pin 13.

The colors for the wires from the VSS to the PCM are obviously different and pin/connector #'s and colors are listed in the diagrams above.

Here's the connector view for C1. It's the blue connector on the PCM.

97 Camaro 3.8 C1 (Blue) Connector View.jpg

[5NINE!]

The VSS has 2 wires. A yellow and a Brown. The yellow connects back to pin 6 on the PCM harness. The brown one is not making a connection to any of the ports in the PCM that I have tested. Is this just a ground wire or should it correspond to the PCM as well? Everything else has checked out continuity wise besides this one wire

[5NINE!]

Just looked at the diagram again. I can see that it is important since its the low speed wire. So what port should it correspond with in the PCM?

[meissen]

-Edited: All sorts of information for the wrong vehicle -

[birdie2000]

According to the diagram I posted, the purple (or brown if that's what yours is) should go to pin 47 in the C1 (blue) PCM connector.

[meissen]

According to the diagram I posted, the purple (or brown if that's what yours is) should go to pin 47 in the C1 (blue) PCM connector.

This is what I get for not reading the previous posts. Yes Jim is correct - that diagram shows pin 47.

[5NINE!]

All of the connections checked out, so I replaced the VSS for the hell of it. Still nothing. I am completely stumped now.

[5NINE!]

I am afraid to even say this, but is it possible that it is the PCM?

[meissen]

I really doubt it... How was the gauge cluster checked out to ensure it's OK?

[birdie2000]

While it's entirely possible that they're two separate issues, since the cruise is also not working there's a part of me that's still suspicious of the wiring, or to a lesser extent that the pcm isn't sending out the signal properly somehow.