Sure enough after looking at the chips about 3 times
There was one with the top blown off!

And the problem didnt follow ey? Now you have no steering? Probably a fried print board. With trucks battery disconnected, remove main print board from controller panel and remove metal cover. Look where the gate wires for the igbt's plug in (upper right quadrant of card) and look real carefully with mag glass. Look for blown out component(s). This sometimes happens when the igbt shorts out gate side. Always replace the igbt's with matching pair. Card can be remanned.

Installed new igts and currant sensor now getting code
PS-TR. *514 any ideas ??

Swaped the igbts only to get steering code and did not steer ether direction. Going to change igbt's

Parkway; Go to the trucks on board diagnostics and identify what the inputs for the steering are doing and also what the outputs are doing. If the transistor are bad you should be seeing a fault number in the display and you will have lost the traction drive.

I believe that model has a pressure tansducer on the steering drag link to send a signal to the steering servo. One side of that could be bad as it monitors in a push pull type of manner to adjust direction.


The other possibility and most likely is in the back SCR panel behind the steering board there are 2 transistors on the top right very small in size one is for turning left, the other for right! check the wiring and make sure wires haven't loosened or broken off at the terminal.


When removing the large steering box make sure truck is unplugged whereas if the box touches a contactor bar it will blow it internally and its $1500 bucks. Just let it hang to the side with a block holding it.


This is based of my CSPO1L - CYBO2L


EDIT: A simple test is to swap the transistors if your problem is reversed you know its that transistor.

check your igbts