https://stream.echo6.co/videos/watch/d3c9b8d2-71c3-4495-9e87-d86700f57eb7 In this video I cover how to test a 3-wire GM MAF sensor and also show how a scan tool can lie to you. There are many names for this condition (limp home mode, fail safe mode etc) where the scan tool will show default or what I call substituted values. If one isn't careful with this condition, misdiagnosis of good components can occur. Engine Performance Diagnostics chapter 11 Symptoms check engine light (Code 34), rough idle, Fix replace the MAF sensor, Tests shown checking scan data for related PIDs, how to use a scope to check a digital MAF sensor, how to view the scope and scanner simultaneously on the Snap-On Verus, how to check a MAF sensor power and ground, identifying scope noise, Tools used Autel MS908 MaxiSYS Automotive Diagnostic & Analysis System - USA Version https://www.jbtoolsales.com/autel-ms908-maxisys-automotive-diagnostic-analysis-system-usa-version#oid=1014_1, PicoScope 4425 4 Channel Standard Diagnostic Kit http://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582af6ff81c728f42d0d&go=http://www.aeswave.com/PicoScope-4425-4-Channel-Standard-Diagnostic-Kit-p9276.html, Playlist (Chapters 9, 10 and 11) The 5v Reference and Signal Circuit Quick Tests https://www.youtube.com/playlist?list=PLAFYVCyenqcpP9ykkWb2D16nVEjyQ1eTZ, Related videos How to test a GM MAF Sensor (Part 1) https://youtu.be/p2QLxxstRn8, How to test a GM MAF Sensor (Part 2) https://youtu.be/E8sBg7kMbOw, How to test a MAF sensor using a Picoscope - GM https://youtu.be/h5KAHv47viw, Dirty MAF Sensor Case Study https://youtu.be/Hmt_LNJ9GkI, Ford 4-wire MAF sensor wiring tests (integrity testing) https://youtu.be/ejh_ZCntFkE, For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com 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 https://www.scannerdanner.com/join-scannerdanner-premium.html 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! Disclaimer: Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC. Sun, 03 May 2026 08:52:34 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/d3c9b8d2-71c3-4495-9e87-d86700f57eb7 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.