Mark supplied me a file with the schematic to make a bench harness for the OBD1 LT1, I can't locate the file right now but have a hard copy. Made a harness and checked it several times....

I pinned the harness by "pin numbers" used in the schematic but when using WinFlash...keep getting an Error that it can't communicate with the PCM..

Rechecked the pins again, have the correct Com Port, Selected V8 LT1 still can't read.

Looking at the schematic are we looking at the harness connectors or PCM side, also what is the view of the OBD connector in the drawing?

Thanks