I have a 93 z28 and my speedo has never worked (bought it used). I have tried changing the VSS and it didnt help. The entire guage cluster works execpt for the speedo. Previous owner said that the speedo worked on and off, but I have never seen it work. Is there a way to test the cluster? Also, the car will throw an SES code of 24, which is related to the vss. Any Ideas?

thanks

 

maybe its not the sensor itself, but the wire going from/to?

 

ok, does anyone know where the wires from the vss go? I am pretty sure it goes straight to the ecu, but what pin? I checked shoebox's website, but couldnt find any reference.

 

Yellow wire goes to pin 32 of the red PCM connector and the purple goes to pin 31 of the same. Check for opens, shorted to ground or shorted to each other.

 

The 1993 uses an ECM that is different from 1994-1995.

Brown connector "D"
Pin
D1=VSS ground (purple)
D8=VSS output to cluster (dark green/white)
D12=VSS signal (yellow)

A problem with any of these can cause a DTC 24.

 

cool, thank you very much, I need to go check it

 

My bad, gotta get a 93 book someday. Thanks Rob

 

helms is having a sale on shop manuals, the same the dealer uses, $30 for 95 and prior vehicles excluding the Vette.
www.helminc.com