Dirty MAF Sensor Case Study

2000 Toyota Corolla MAF sensor testing. Using a scanner and labscope.
Trouble code P0171 in memory. How to determine what is causing the engine to run lean.
Symptoms:
- low power
- hesitation
- check engine light with a P0171 fault code

Fix:
- clean dirty MAF sensor

Test procedures shown:
- how to test a mass airflow sensor
- how to use a the oxygen sensor at wide open throttle to test fuel delivery
- before and after cleaning scan data and scope measurements of the MAF sensor
- throttle position sensor will not reach 100% on scan data
- how to clean a MAF sensor

Tools used:
- Lab scope
- Scan tool
- Back-probing pins
- Brake cleaner/MAF cleaner

Related videos:
- How to troubleshoot a faulty MAF sensor
https://youtu.be/5Zb7q0aunz8
- How to test a Ford MAF sensor
https://youtu.be/WH1GLWSTTXM
- How to identify and clean a dirty MAF sensor
https://youtu.be/CEKjjXNLTjk
- How to identify and clean a Dirty MAF Sensor
https://youtu.be/QwGICKqWgM4
- False MAF sensor trouble codes (cracked air intake tube)
https://youtu.be/-5L5tp4NDq0
- MAF and lean codes from a missing air filter (P0171, P0174, P0102) https://youtu.be/m-qJ58scPJE
- How to test a 3-wire MAF sensor (wiring and sensor tests)
https://youtu.be/EhdnfhiTi5U
Playlist:
- (Chapter 12) Mass Airflow Sensor Testing
https://www.youtube.com/playlist?list=PLAFYVCyenqcrUtzoyk65FMfo9pxhK6Vay

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.
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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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