these trucks eat batteries and wire harnesses. there are probably multiple codes that are all "OORL". ed is right about access codes, need to contact the dealer. if you enter the wrong code 10 times the machine will shut down permanently and can only be resuscitated by the dealer with a computer.

Neil, you will need to have the local Hyster dealer to reset and give you the password for this truck, and there are a few levels of passwords. no one else other than Hyster dealers will have the software to be able to access the passwords, and very few people other than Hyster dealers will have the experience to help you with this truck
676-4= Glow Plug Relay Driver Output Out Of Range Low
I take it this is a deisel truck.