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.
   • Chapter 4 Oxygen Sensors and Fuel Trim  

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
   • (Chapters 4 and 5) Fuel Trim and Oxyg...  

Related videos
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- Low fuel pressure causing a P0171 and P0174 trouble code
   • Low fuel pressure causing a P0171 and...  
- Ford F-150 P0171 P0174 Trouble Codes - vacuum leak (water test)    • Ford F-150 P0171 P0174 Trouble Codes ...  
- STFT reads opposite of LTFT (after repair fuel trim data)
   • STFT reads opposite of LTFT (after re...  

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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