Yeah That's what I thought it just rubs my watsus the wrong way not to be able to fix something!!! I wish there was a standardized OBD system for our industry or at least a cost effective way of getting it done. I wouldn't mind buying software if it was cost effective but I only have 2 jacks in the vehicles I care for with this system currently. Mitsu won't even sell the system and JungHeinrich isn't much help either. It is something to think about when recomending a forklift to purchase for my customers.
Thanks for the reply
I would think your most cost effective repair may well be to get the manufacturer's trained service tech to check it out, these units have pretty good computer diagnostics if you/they have the program and cables and training.
my WAG [the 'w' stands for wild, the 'a' refers to a name for a donkey, and the 'g' for guess] is the directional control in the 'tiller' control handle head, but like you said, these are kind of 'high dollar' parts to swap parts, and you would still most likely need to get the "tech with the laptop" in to setup the new control cards.