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Hello all;

Been working on a new to me(seller stated this as new) PS3 diesel engine item number 20-20367-1

First issue when loaded into my remote, it showed a UP DD40AX engine (not a big deal... but clearly was not new) Also, the board itself (little sticker) shows as a WM GP9...and it is not that. All other functions/features appear to operate as designed.



When selected speed step 1 SMPH, engine takes off, I would say about 20 SMPH...not full speed. Adjusting the acc rate from 4 SMPH to 2 SMPH, it still goes to 20 SMPH but takes longer to get there.



What I have done:

Reseat the tach reader and checked for cold/poor soldering joints, to no change

Perform both a factory and feature reset to no change

Moved the PS3 board into a known good chassis and it performed the same way



Only thing I have not done was redownload chain/sound files, as I have a chromebook and it does not have windows



Any further thoughts or is something on the PS3 board bad? Thanks!

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Hard to say, my first step would obviously be to load the chain and sound files.  That being said, this does kinda' sound like a failure on the board.  As you surmise, it's clearly NOT a new locomotive with that board in it, and it sounds like the board has a problem.

Check the wiring from the tach reader all the way to the 40-pin connector on the PS/3 board and make sure all the wires get there.  If that is good, check R358 and see if it measures 10K.  If not, that's a problem, and is one component on the PS/3 board that is identified as causing a runaway.

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