https://stream.echo6.co/videos/watch/91112a28-66a7-4f01-b37f-0c0a6ddc30c3 What do you do when the flow chart leads you to engine computer replacement? Think outside the box! This case study emphasizes why I think manufacturer flow charts are misleading, and shows what tests you can do to avoid replacing a computer for nothing. Engine Performance Diagnostics chapter 21 Symptoms check engine light (P0335, P0520), long crank time, starting fluid required to start, especially cold, Fix repaired camshaft position sensor wiring, replaced the camshaft position sensor, Tests shown understanding GM 7X and 24X crankshaft position sensors, how to test a three wire pull-up hall effect sensor and wiring, how to perform a short to ground test with a ohm meter, using a wiring diagram to identify computer power and ground circuits, understanding internally sourced/externally separate PCM voltage feed circuits, how to disassemble a camshaft position sensor connector and repair bare wires, Tools used scan tool, lab scope, heat shrink/electrical tape/conduit, 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, Bad Engine Computer Testing Part 1 https://youtu.be/hJQ6qnhTgdg, No Start from a shorted MAP sensor (Honda, Acura) https://youtu.be/za13UnpbH7E, How to test an electronic EGR valve (GM P1406 case study) https://youtu.be/te_kapz-fj4, 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. Fri, 01 May 2026 08:21:22 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/91112a28-66a7-4f01-b37f-0c0a6ddc30c3 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.