When I first bought a code reader about 4 or 5 years ago,they gave you a book of codes,I have bought 2 since and they don't supply a code book,but they all
have given a code and description.All have been at the £10 mark.All from ebay.The only code in the book is U0122 which is Lost Communication with Vehicle Dynamics Control Module.The other codes I think you can Google.as for wiring diagrams, I think your be lucky to get for a frv my crv is 09 and they are still
reluctant to let haynes produce a book even thou' you can buy an American one but not for a diesel.They should be proud not to be on a list of manufactures
who over claim how far there cars travel on a gallon of diesel.