MAF sensor code P0102 from a bad engine computer - (Chevy van)

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1996 Chevy Van G1500 5.7L Computer Problems. This was a common problem on the early General Motors full size G vans and Astro vans. They mounted the computer right below the brake master cylinder and they suffered from water intrusion. This was caused by a failure of the steel bolts that held the two halves of the aluminum computer housing together. Knowing the circuit design of this MAF sensor was the key to proper diagnosis of a bad engine computer.

Engine Performance Diagnostics chapter 2 pages 8 and 25. Also chapter 12 pages 6 and 7

symptoms 50

  • multiple trouble codes (P0102, P0132, P0137, P0300, P1406, P0748)
  • misfiring
  • low power
  • hesitation problems

fix 50

  • replace faulty engine computer

test shown enh 50

  • how to test a MAF sensor circuit on a GM using a scope
  • how to test for proper power and ground to a MAF sensor
  • how to test a pull-down type signal circuit
  • how to test an EGR valve position sensor circuit

Tools used

  • scan tool
  • lab scope
  • backprobing tools

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Playlist

(Chapter 12) Mass Airflow Sensor Testing

Related videos:

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

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

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

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How to test a MAF sensor using a Picoscope - GM:

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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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