Diagnostic Codes Help
 

Hey everyone, I just want to get some quick help if you guys can spare some time!

I've been having trouble with my Speedometer not registering at all--it just drops to 0 and stays there. Sometimes it'll try to read correctly, but it'll be bouncing around until it finally drops to 0.

Also, my Fuel guage doesn't read correctly as well, reading 1/2 tank of gas all the time, until it drops to empty when I'm running lower on gas, I guess.

I've almost bought a new fuel sensor and probably will as I have tried different fuels and have tried seafoam.

Anyway, I got these diagnostic codes:

If anyone can help me decode the steps to fixing mainly the Speedometer problem, that'd be great! Most of these codes I'm not sure exactly what they mean, I'll have to see if I can find the repair manuals.

Also, can anyone tell me if any of these codes are related to one window rolling up slower than the other, or if they're related to the easy-entry seats not working sometimes?

Thank ya!

For troubleshooting simplicity, I would clear all the codes (unless this has been done recently) and see what comes back after more driving.

You have a bad ground somewhere or the serial bus cable in the door accordian may be having issues.

Well, check the speedometer connection at the top of the differential and see if its clean and properly connected.

What does the VSS look like? I'm trying to locate it near the differential and its connectors. Some people say its on the top, to the side?

Are there any diagrams or anything? Trying to make sure its clean and secure but I'm not quite sure where it is?

The speedometer defaults to 0mph so its gotta be related to the signal circuit from the VSS, just can't find it!

www.google.com->Put in C5 Corvette VSS

Easy-Peezie

My google must not be that good :O it just comes out replacing the differential

Just reset all my codes

Got

TCS
C1241HC

HVAC
BO361H
Bo363H

Speedometer still stuck at 0. I'm sure more codes will come back

Looks like your magnasteer connector isn't connected and you've probably lost the driver's side hvac actuator. Reset the hvac codes as this will cause it to recalibrate. If the code comes back, you need a new actuator. The speedometer connection is usually right there on top of the differential. It should be easy to inspect and insure its clean and tight.

Looks like the HVAC codes keep coming back. I'll check out the differential again and see if I can get it. Is it next to wide black ribbed looking cables/wires?

Also I'm not familiar with the magnasteer, what kind of problems does this cause?

You've been very helpful! Thanks a bunch :cheers:

The magnasteer connector changes the "feel" of the steering at different speeds. There's a connector coming from the steering rack that connects to the wiring bundle down there.

I don't know what the color of the wires are at the differential, sorry.

Since the hvac codes keep coming back, this is probably the cause:
http://i169.photobucket.com/albums/u...0/DSC_0085.jpg

Finally got a chance to raise the car up, and I've determined its not the VSS causing trouble with speedometer.

Gonna check the IPC, any ideas what I might be looking for if anyone has experience with this?

The VSS signal goes to the PCM and the PCM then sends a pulse train to the I/P. You could very well have a correctly working VSS circuit from the transmission to the PCM but still have a bad circuit from the PCM to the I/P. Or you could have a bad I/P.

Areas to check would be Connector C142 Pins A & B for continuity with the VSS and with the PCM Connector Pins 71 and 7. Then check continuity from PCM Connector Pin 55 to the Instrument Cluster Pin A7. If you have continuity on all of those circuit lines then the problem lies with the cluster, the PCM or the VSS if you haven't checked it to see if it is working. The schematic shows the two separate circuits that provide speedometer data. The green circle shows the circuit from the VSS to the PCM and the red circle shows the circuit from the ECM to the cluster.
http://i58.photobucket.com/albums/g2...eedowiring.jpg

Bill