Fuel/Adaptive Memories: Description

In Open Loop, the PCM changes pulse width without feedback from the O2 Sensors. Once the engine warms up to approximately -1.1° to 1.6°C (30° to 35° F), the PCM goes into closed loop Short Term Correction  and utilizes feedback from the O2 Sensors. Closed loop Long Term Adaptive Memory  is maintained above 77° to 88°C (170° to 190°F) unless the PCM senses wide open throttle. At that time the PCM returns to Open Loop operation.