https://stream.echo6.co/videos/watch/4ae3f2de-cac9-4712-a631-4bbc41362131 In this video I will show you how to test a crank sensor on a GM 3.8L (3800) engine. This same type of crank sensor is also used on the 3.3L (3300) engine as well. It is a hall effect type and it produces two separate signals. One is known as an 18x signal (18 pulses per 360 degrees of crankshaft) and the other is known as a 3x signal (3 pulses/360 of the crank). The 18x is used for timing and misfire monitoring and the 3x is used to synchronize the 18x signal. If you lose the 3x signal while the car is running, it will continue to run until you shut the engine off, then it will not restart (no spark). If you lose the 18x signal, the engine will shut down immediately and it will not restart (no spark). There was nothing wrong with the sensor, I am just showing how to test this design. Engine Performance Diagnostics chapter 21 Tests shown how to test a hall effect crank sensor with a scope, how to perform a bypass test with a test light, how to test an ignition module on a GM 3800 engine, how to test the crank sensor using scan data, Tools used lab scope, scan tool, incandescent test light, backprobing pins, Playlist (Chapter 21) Ignition inputs, cam and crank sensors https://www.youtube.com/playlist?list=PLAFYVCyenqcqEN41aYznWn9Nfhy1PiMjo, Related videos Hall effect cam/crank sensor operation and testing Part 1 (an SD Premium video) https://youtu.be/fPkZCJgtUko, Hall effect cam/crank sensor operation and testing Part 2 (an SD Premium video) https://youtu.be/BJp2uVXzUqs, How to test a GM 3-wire crank sensor (hall effect type) https://youtu.be/IzZNlPosGSY, Camshaft Position Sensor Circuit Quick Test https://youtu.be/0xP4lMCdO6w, 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 09:47:22 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/4ae3f2de-cac9-4712-a631-4bbc41362131 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.