124 Data Parameters Gas Engine Parameters On some OBD-I (1991–1995) vehicles, values for short-term fuel trim maybe mislabeled. Seethe note on page page 118 for details. LEARN VALUE O IDLE OK LEARN VALUE OPT OK LEARN VALUE OPT OK LEARN VALUE OPT OK ______________________________________ (range YES/NO) Indicates whether the ECM has determined that the learned lambda value for idle or part load sections is within tolerances. They read YES when within tolerance, and NO if the ECM has to relearn the lambda adaptation settings in the idle engine load range. LEARN VALUE O SNS IDLE) ____________________________ (range not available) Indicates the learning value for the OS when the engine is idling. LEARN VALUE O SNS PT) _____________________________ (range not available) Indicates the learning value for the OS when the engine is in part load according to the throttle position. LEARN VALUE THR VALVE ADJUSTER ________________________ (range not available) Indicates the internal ECM figure for the learning value for the idling stabilization by throttle valve positioner.