Komatsu PC200-7 Throttle Issue

Throttle control in the cab not working. I am getting resistance when I check the controller but nothing at the 3 or 4-pin connector at the controller on the engine in the rear.

What is between the throttle control knob and the engine controller that I would loose power? Is there a diode somewhere I can't find?

Thanks guys!

Komatsu PC200-7 Throttle Issue