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The procedures shown in this video can be applied to all 3-wire General Motors MAF sensors. (Chevy, Buick, Olds, GMC, Cadillac)

The frequency specification I quote in this video will differ depending on engine size but the electrical tests shown, particularly in part 2 are universal and apply to ALL GM MAF sensors. The vehicle being tested is a 1997 Buick LeSabre 3800 with a MAF trouble code P0102

Engine Performance Diagnostics chapter 12 page 7

symptoms 50

  • intermittent stalling
  • hesitation on acceleration
  • check engine light (P0102, P0103)

fix 50

  • replace faulty MAF sensor

test shown enh 50

  • how to determine if the MAF sensor is dirty using a frequency graph on a scan tool
  • how to identify a glitch or drop-out of the MAF signal
  • difference between a scan tool graph and a scope graph
  • scope test of a digital type MAF sensor
  • multimeter test of digital type MAF sensor signal (can it be done?)
  • will a digital multimeter catch a very fast glitch in a signal?
  • how to use the min-max scale of a multimeter

Tools used

  • scan tool
  • Snap-on Vantage Pro
  • digital multimeter
  • back-probing pin

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Playlist

(Chapter 12) Mass Airflow Sensor Testing

Related videos:

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

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Low power, lean conditions (cracked air intake tube) GM :

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MAF sensor trouble code (P0102) caused by a bad ground (GM 3100):

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Digital MAF Sensor Test using a Picoscope:

{youtube}h5KAHv47viw|615|345|0{/youtube}

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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.

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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!