my "instant W.A.G." is you have a wire off, or broken right at the connector of the accelerator start switch (maybe and more likely the switch itself, but I am throwing out a wild guess). This assumes you have an ev100 controller fitted to this machine,
What it really means s that the accelerator pot voltage is too high before some other start up connection is completed in the correct order, and could well be the power to the directional selector or park brake switch.