LEARN VALUE MIXTURE(ADAPTIVE) __________________________ (range not available) Indicates the operation and Long-term correction of the fuel delivery. It shows whether the ECM is commanding a rich or lean mixture. The number theoretically can range from 0 to 255 with 0 as the midpoint. A number of 13 to 128 indicates that the ECM has commanded an overall lean mixture correction. A number of 128 to 243 indicates that the ECM has commanded an overall rich mixture correction. These Long-term correction numbers are calculated by the ECM from the Short-term fuel correction patterns or trends. Fuel correction operates only in closed loop. In open loop, a fixed value displays. On some OBD-I (1991–1995) vehicles, values for short-term fuel trim maybe mislabeled. Seethe note on page page 118 for details.