How to test and fix a PGM-FI main relay - Honda/Acura

Honda PGM-FI Main Relay Testing (1998 Honda Prelude) How to test and fix a main relay on a Honda or Acura. Engine Performance Diagnostics chapter 18 Symptoms (typical of a main relay issue) - intermittent no start - start/stall - stalls and will not restart for a period of time Fix - replaced PGM-Fi main relay fuse Tests shown - how to determine what is powered by the main relay - main relay wiring diagram review - how to identify condition of the main relay by testing for power at the fuel injectors and idle speed control motor - how to test a PGM-FI main relay - how to locate the main relay - how to remove the main relay - how to locate a cracked solder joint on a circuit board Tools used - incandescent test light - soldering gun Playlist - (Chapters 17, 18 and 19) Fuel Injector Testing https://www.youtube.com/playlist?list=PLAFYVCyenqcoYm94zK0-EP0ICsGWj_ICs Related videos - Operation and testing of a Honda main relay (PGM-FI) - an SD Premium video https://youtu.be/QVxOQTSPyGY - How to identify a bad main relay on a Honda (PGM-FI) https://youtu.be/6CMZ4g8n0FQ - How to test fuel pressure, injector pulse and spark with basic tools https://youtu.be/SUxagOAVS5M 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.