- first check battery and make sure it is charged
- secondly, check the control fuses usually located on the control panel
- thirdly, check the power fuse located on the control panel (usually a larger fuse in the 60 amp range (this could vary a few amps)
- fourthly, the power steering contactor (and tips)
- and lastly the power steering motor brushes

now if all the electrical side of the power steering circuit is working as it should and the motor runs? then you will have to look for things like a broken pump and/or pump coupler

in most cases when its coding out its just an electrical failure such as a blown fuse
good luck