This engine is a K Line K3380-1361C, Steam Locomotive. The symptoms are: All functions seem to work from a Lionel Legacy Cab Controller. However when activating the throttle the Locomotive does not move. After attempting to cause the Locomotive to move the functions that worked before no longer are activated when commanded.
The locomotive will accept ID reprogramming and acknowledge with the characteristic whistle blow. Not that I believe this to be an issue but is puzzling to me, When I reset the Locomotive by performing the classic ENG-"ID"-SET-AUX1-"Eng Type" sequence the Keypad does not show a numeric alternative, only the functions of Legacy when executing the AUX1 key. I was under the impression that the AUX1 brought up the numeric keypad. But I issue the key that would be "Eng Type" being the four position but no indication that sequence was received by the Locomotive aka Whistle Blow.
My first sequence of physical trouble shooting was the removal of the Tender Shell. Visual inspection revealed nothing out of the ordinary. I removed the two daughter boards and reset them. Reassembled the Tender and proceeded back to the layout. No difference in activity as experienced previously. Thinking that it might be a "Cruise Control" issue due to nonmovement of the Locomotive, I proceeded back to the Bench. I removed the Boiler Shell and visually inspected the innards. Again every thing looked nominal. One thing I did not expect was it appears on this Locomotive the Cruise Control is monitored with a light source through a slotted wheel by the Flywheel. It seems the last locomotive that I had an issue with had a paper tape around the flywheel for the Cruise Control. I half expected that to be the issue when I began to suspect the Cruise Control as that tape had a habit of coming off the Flywheel.
There was one daughter board that I reset and as with the Tender I again saw no indication on any of the boards any heat damage. At this point I still have the Boiler Shell off and am waiting to see if anyone can point me in a direction to remedy my issue(s). Thanks again to responding to yet another "What's wrong with my Locomotive" thread.