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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(Chapter 12) Mass Airflow Sensor Testing

Related videos:

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


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


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


Digital MAF Sensor Test using a Picoscope:


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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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