Understanding Short Term and Long Term Fuel Trim (a SD Premium video)

This is a ScannerDanner Premium video recorded during my class at Rosedale Technical College. The rest of this series on oxygen sensors and fuel trim can be found here. https://www.youtube.com/playlist?list=PLM4TD8… Engine Performance Diagnostics chapter 4 pages 7-19 Topics cover - purpose of short term and long term fuel trim - which fuel trim data is retained in memory - upstream and downstream oxygen sensors - purpose of bank control fuel trim - how to use fuel trim to identify type of lean condition - how to tell if the fuel trim has reached it's limit - counter fuel trim number (did you fix the car?) - what does a vacuum leak look like compared to a low fuel pressure or dirty MAF sensor problem? - how to clear long term fuel trim memory Playlist - (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing https://www.youtube.com/playlist?list=PLD2809… Related videos - How to identify a vacuum leak using fuel trim data