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

end faq

Playlist

(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) :

end faq


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.

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