My new FP45 Santa Fe PS3

Well, at least we nailed down the problem to the engine.

Does it operate conventionality or is it completely non-responsive?

It does work in conventional, no problem, but, not with DCS at all, I am not an expert in Electronic but my two cents opinion is that the electronic device who picks the DCS signal from the track does not work, therefore my remote shows "not engine on the track"

You can add a MARS light that isn't dependent on the electronics.  These are tiny modules that will fit anywhere.  ngineering MARS Simulator

They do a very nice job and are reasonably priced as well.  It would be easy to connect this to a PS/2 locomotive, as you can connect it directly across the headlight for power.  Since the PS/3 directly drives the headlight LED, this may take a bit of work to get a MARS light working in one of those.  Of course, you could use track power, and with a bit if circuitry, you could sense the headlight state and switch it on or off...

It does work in conventional, no problem, but, not with DCS at all,

Make sure that the DCS/DCC switch is set to DCS. If it is, switch it to DCC and see if DCS can find it. Sometimes the switch is wired reversed.

 I took the shell off in order to find the DCC switch because the Quick start manual does not mention anything about DCC it only shows two little pots located underneath the engine: one is volume control and the other one is smoke unit, in fact the manual that came in with the locomotive is wrong because the picture shows four wheels power trucks with two center pick up rollers and my engine has six wheels (four of them power   and the other two idler wheels) with only one center roller per truck and there is no DCC switch what so ever, there is only one board with a lot of mini plugs and that was my chance to check and make sure all them are plug in all the way, I did not see any loose connection either, I can not download the complete manual from the computer because is not available yet because this is a new locomotive, so I am stuck until tomorrow get in touch with MTH service 

Take a look at the underside of the frame behind the trucks after rotating them to the side. That's where they are on some MTH diesels

I just look at the underside as you said,only two small pots: smoke and volume that is nothing else.

I think the DCC/DCS switch is only on premier models, not the Railking versions.

I believe you are right, my loco is Railking

Chuck,

I think the DCC/DCS switch is only on premier models, not the Railking versions.

You may be right.

I know for a fact that my new PS3 RK Imperial M1A Mountain has no DCS/DCC switch. Instead, it has an internal jumper. If his engne has such a jumper, it may be set to DCC. If so, MTH should be able to confirm this and tell him what to check.

You got this to load once.  It may be worth trying a recover engine to see if that gets it back into the DCS.

Since you have the shell off, you can inspect the wiring around the PS-3 board to see that it is not to close to the Torrid coil inductors and interfering with the DCS signal.  This was a known issue on early PS-3 engines.  G

Finally I got in  touch with the MTH Tech and the conclusion is that I have to send my new FP45 Santa Fe to MD, so, it is in his way to get it fix, I do not know how long it is going to take to get it back