Quote Originally Posted by ralmo94 View Post
Not EE specific, but an open loop table is used when open loop. While open loop, the loop to the O2 sensor is not used, such as warm up, PE, Decel cut off, or O2 error. Some tunes have the table enabled during closed loop for sort of a lean cuise, anytime anything other than stoich is targeted, you are open loop
Sure, but that doesn't answer the question. Without the ability to have any kind of precise AFR feedback, how is the PCM "targeting" a specific AFR? What is $EE using to determine AFR if not a lambda sensor?