In this video I will show you how to test a GM 3-wire MAF sensor using a lab scope. GM uses a frequency or digital type of sensor which will produce signals ranging from 2000 to 10000 Hertz (cycles per second). I will also show you how to identify and clean a dirty MAF sensor.

Engine Performance Diagnostics chapter 12 page 7

symptoms 50

  • stalling
  • poor acceleration
  • check engine light (MAF sensor codes)
  • low power
  • surging or bucking

test shown enh 50

  • how to test a digital type MAF on a lab scope
  • how to graph a digital signal
  • how to measure a variable frequency signal on a scope
  • how to identify and clean a dirty MAF sensor

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(Chapter 12) Mass Airflow Sensor Testing

Related videos:

How to test a GM MAF Sensor (Part 1) :


How to test a GM MAF Sensor (Part 2):


False MAF sensor codes, bad engine computer - (Chevy van):


MAF and lean codes from a missing air filter (P0171, P0174, P0102) :


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available 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. 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!