[bionictony]

on the passenger side, near where the feet goes, peel back the carpet and theres the ecu, in the middle, theres a clear circle, when its visible, turn the key to just before the engine starts and everything lights up. then look to the ecu hole, count the blinks after the first blink. it should be between 1 and 20. look out for the patterns though, they repeat after 1 or 2 seconds.

then go to google and search for 88-91 civic error codes and it gives a list of codes and problems.