This is the link to the online workshop manuals for the 88-91 Prelude.

http://www.preludeaustralia.com/manuals/3rdGen/

ECU code diagnosis.
http://www.preludeaustralia.com/manu...f100/6-136.pdf


HIGHLY RECOMMENDED.
If you want your own copy you may download it from here
You want the "Ab0VE Honda Prelude Generation III (88-91) Service Manual zip" 56.63 MB file.

http://hondatech.info/downloads/Auto...e/Prelude%203/