Caterpillar 325LN throttle problem

Hello, I have a Caterpillar 325LN throttle problem, with AEC ON, when pressing the pedal for moving the automatic throttle works but when working automatic throttle doesnt work, I swamped the valve responsable for this, and everything the same, I tryed to calibrate the governor and at the end it gives me ACE and error - 2. I dont have the information about this error code, this is not the normal error codes, its and error related to calibration. Any info on this? Thanks