DTC P0300: Engine Misfire Detected: Description

PCM uses pulses from crankshaft position sensor to determine position and RPM of engine at various degrees of rotation. PCM bases misfire diagnostics on the principle that crankshaft velocity will increase as each cylinder contributes its power input. Under certain conditions, PCM will monitor crankshaft velocity variation in a series of 200 revolution tests. If 20-100 percent of revolutions fail, a catalyst damaging misfire has occurred. If 2-19 percent of the revolutions fail, an emission related misfire has occurred. The MIL will flash if an active catalyst damaging misfire occurs (20-100 percent) and will stay on steady if an emission-related misfire (2-19 percent) is present after 2 consecutive trips. The MIL will turn off after 3 consecutive passed trips meeting the same misfire criteria or 80 passed trips if the criteria has not been met.