Engine works on on e track but not the other

Well, is the engine a PS2? If yes, PS2 is specifically DCS signal polarity sensitive, where PS3 engines do not care and work either polarity. By polarity- I mean red post of the TIU must go to center rail, and black post must go to outside rail. Again, PS2 engines will not communicate DCS signal when polarity is reversed (engine not on track, not found).

Since this is a scenario where it works on one track, but not another- the wiring of the track between the TIU and the track is suspect.

Edit- also, most basic of basic tests, using a lighted car or caboose- you know the track segment the engine is on has power from the TIU- but you appear to have a DCS signal problem.

Thank you for replying. I forgot to mention, that is the only engine that does this. I have a lash up on track 3 that works fine. There is power to the tracks as the caboose lights up when track powered. I swtiched wires, but still get the same result-ENGINE NOT ON TRACK.  I have a DCS issue. 

I don't want to see you stuck, but we need more information about this engine.

What is the exact product number 30-xxxxx-x or 20-xxxxx-x product number off the box?

Have you replaced or inspected the battery if it is a PS2 (back to that product number and more engine details) ?

• MPN
  2026081                             

  • MPN
    2026081
  • GTIN
    0658081093369
  • UPC
    0658081093369
  • eBay Product ID (ePID)
    1957685074
• UPC
  0658081093369
• eBay Product ID (ePID)
  1957685074

I have an MTH battery charger. I might try that to see if the battery needs a charge. Still, it works fine on one track but not the other. When I read the engine on track #1 on which it works. it reads:  TIU 1  NO AIU.  Thank you for your consideration.