The Min Output table sets the smallest idle output the ECU is allowed to use. It has the final say: whatever the open loop base, closed loop corrections or other adjustments ask for, the output never drops below this value.
You use it to stop the idle system from closing so far that the engine stalls, for example when coming back to idle quickly, when the closed loop controller overcorrects, or when a load switches off. Check it by logging idle output alongside RPM: if the output is regularly sitting on the minimum, the floor may be doing the work your base table should be doing, so revisit the base table rather than just raising the floor. Keep the minimum low enough that the controller can still bring RPM down to target.
See Idle Control for the full setup and closed loop base for tuning the controller.
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