Hi:
To get the codes do the following. Put the key into the ignition and turn to on--but do not start. The DIC will go through its cycle "General Motors Corvette--ECT----When that finishes hold in the options button--While the options button is held in press the fuel button 4x. This will take you to the Diagnostic display which will go through all of the various computer modes. If there are codes they will appear after the computer mode. this will run through the whole cycle automatically. When the auto cycle is complete, it will go to a manual mode. The options button will take you to each code. If you have an error-- by hitting reset the error will be removed. The options button and the one above it will take you manually through all of the possible errors and you could remove them one by one if you want.
I just went down to the "Z" and know that this will work--- Good luck---
Wonderful Forum with a lot of quality info.
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