MM gurus........No AFR just electrical diagnosis help please

[threadkiller]

A guy limps in with his 2000 FL having replaced his own TPS. While warming up his bike to properly set his "new" TPS value at .275 the bike ran/idled fine, but after setting the value the bike backfired out the pipe and refuses to start. While many of the historic trouble codes are interrelated (11, 12, 15, 41, 42, 56) why would a bike "run" with a haphazardly hung TPS and then not run after the proper value was set? If a TPS unit was "good", what is the direct wiring relationship (if any, outside of the ECM) to the other sensors? Would issues with a CMP/CKP directly affect the function of the TPS? The electrical diagnostic manuals have pointed us at the B/W wire between the TPS and the ECM having a short to ground/open. Where would this interuption most likely occur? We are attempting to troubleshoot without having a breakout box so any additional information, tips, and advise is greatly appreciated. Thank you very much! TK.

Current codes are #11 TP out of range/open circuit/short to V-Batt & #12 Baro out of range/open circuit/short to ground. Both these codes register as "default" in my H-D Scanlyzer. According to the elect. manual the B/W wire is common to the IAT, CM, CK, Baro & TPS so my difficuly could be anywhere.

I know that with some TPS' on cars that you can bump up against the throttle plate nd then back off a RCH. Would an old school method like this be okay for a base setting?

[RoadKingTrooper]

Probably the wrong answer, but........................when my 2000 RK started backfiring and wouldn't idle, I checked the codes and started with the lowest, battery voltage. I checked and found only 11 volts. I replaced the battery and it ran fine.

12.6 volts is REQUIRED for the ECM and sensors to function correctly. If battery is ok, I would check electrical connections and cable connections

[Ratfade]

Did he have both the warm and cold idle screws far enough out so as not to affect anything when he set the TPS voltage? If not, the .275 setting will definitely be off enough to cause codes.

[JohnCA58]

another thing to do,  go ahead and rotate the TPS while the bike is idling, check at which position it runs best at. small incremental movements