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Don't know about the tuning part.
But as for checking codes. Drop down your Glove Box and reach back in there to the left. You should see a rubber deal. Pull out the plug that has 2 wires going to it and jump it with a paper clip. Once you turn the ignition on the CEL light will blink and tell you the code number.
This is a good thing to know as you can't adjust idle speed via the idle adjustment screw or adjust ignition timing without first jumping the ECU.
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1993 Honda Civic EX
B18B1 LS Swap.
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