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· Wrencher Extraordinaire
2005 K1200LT
15,452 Posts
The brain may have "forgotten" the trip point and you need to reset it next time you know you have about 1 gallon left. If this does not fix it then the control unit has gone south.

  1. Empty the tank and fill it with 1 gallon (or your desired quantity).
  2. Make sure you have access to the diagnostic port of the Motorcycle and identify pin 3 and pin 4.
  3. Turn the ignition on.
  4. On the diagnostic port, short pin 3 (brown/black) and pin 4 (brown) for two seconds. (Make sure you have the CORRECT pins - you don't want to short Battery voltage to GROUND by mistake).

  5. The tank reserve light should flash quickly. When the flashing ends, the calibration is complete.


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