G,
So what do you think of the 5 engines that I couldn't get to leave reset or do any programming (factory resets) until I placed a good chip into it, ran it, did a reset 18, and then the original worked after replacing it? I figured they had deselected. They acted very much like Mike's engine.
They've run fine since. I'm not sure if my 20-2147-LP Amtrak F-40PH engine's chip had 1996 on it or not without opening up the engine.
I use a Z-4000 with remote receiver and by-pass the TIU when working on these as I have seen a couple of engines not liking the TIU. Especially when double heading. These engines above that wouldn't leave reset were purchased needing repair. I haven't scrambled any myself when in use.
I've known about the PS2 hard resets for a number of years where the board is shorted by jumping a couple of pins on the board, but I don't know how it's done. Only MTH techs have that information and MTH doesn't want everyone to know how to do it. I think it resets the mileage and hours went done. Sometimes it can resurrect a dead board but not always if something is blown on it. I've never heard of a hard reset for PS1.