Unable to read engine codes
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6th Gear
Joined: May 2025
Posts: 6
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Unable to read engine codes
I recently got my 85 c4 Corvette running after doing rod and main bearings. It runs great but has a cel on, so I went to scan it and the paperclip trick didn't work. I tried wiring the diag connector directly to engine ground and got nothing. I have just under 5v between the connectors on the aldl, which I'm told us what it should be. The car needs a tune but doesn't show any signs of a ecm problem. I never scanned the car before I tore everything apart so I'm not sure if it's had this issue for a long time or if it's new. The previous owner said it was "OBD2 converted" which makes no sense. I know that the car has a moates ostrich, that wouldn't change how I have to read the codes right? Also is there a chance that a actual code reader can read it? It seems like all the scanners do the same thing as just jumping the terminals, but I could be wrong.
At this point im very stumped. I seem to have voltage and ground everywhere I need it, but yet I still can't read the codes. If anyone's had any ideas on what could be causing this issue please let me know.
Thanks so much,
Vr4demon
At this point im very stumped. I seem to have voltage and ground everywhere I need it, but yet I still can't read the codes. If anyone's had any ideas on what could be causing this issue please let me know.
Thanks so much,
Vr4demon
