underneath the dash you should find a group of wires. among these wires you'll find a plug that doesn't seem to have a corresponding end...and this is what you'll use. next, take a paper clip or something that will complete the circuit and "jump" the ecu. what this does is send a message to the guage cluster which in turn makes the check engine light blink. after that, reading the code is simple.

long blinks are 10's...short blinks are 1's. so...long blink, long blink, short blink is a 21. there is more information on this and a list of codes on my website.

http://www.hondaswap.com/articles/index.php?id=20