MIXTURE CORRECTION _____________________________________ (range not available) Indicates the operation and Short-term correction of the fuel delivery. It shows whether the ECM is commanding a rich or lean mixture. The number can range from 0 to 255 with 128 as the midpoint. A number above 128 indicates that the ECM has commanded a temporary rich mixture correction. A number below 128 indicates that the ECM has commanded a temporary lean mixture correction. These Short-term correction numbers are also used by the ECM to learn a fuel correction pattern or trend and are stored in the learned mixture or lambda values. Fuel correction operates only in closed loop. In open loop, a fixed value displays.