I dont think that there is a code for money. http://www.gamefaqs.com/console/ps2/code/33074.htm l.
if you look at some walkthroughs they give you ways of making alot of money quickly. But why would you want to cheat? I just got 100% completion on this game the legitimate way and it is much more fun and rewarding than cheating. p.s : cheats can mess up your save file.