Following up my previous case study on a 1999 Honda Accord    • How to identify a bad main relay on a...  , I discuss in detail the operation of a Honda PGM-FI main relay with my class at Rosedale Tech. We get to go into detail about design characteristics, relay operation and control, and some unique features in this relay that might be difficult to understand. Once you watch and understand this material, you’ll have no problem diagnosing these relays and related circuits!

Engine Performance Diagnostics chapter 15

Topics discussed
- identifying the two distinct relays inside the PGM-FI relay, and the circuits they feed
- understanding the control and load side of both separate relays
- correctly dissecting and coloring a wiring diagram for diagnostic purposes
- understanding why relays are used in electrical system designs
- applying Chapter 3 principles to identify relay control circuits
- the cranking circuit bypass, and why this feature was included in the relay
- which solder joint failed in my previous case study video, and what caused it to fail

Playlist
- (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing
   • (Chapters 14, 15,16) Fuel Delivery an...  

Related videos
- How to identify a bad main relay on a Honda (PGM-FI)
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- How to test and fix a PGM-FI main relay - Honda/Acura
   • How to test and fix a PGM-FI main rel...  
- Fuel Pump Electrical Circuits Description and Operation
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- How to test fuel pressure, injector pulse and spark with basic tools - Honda
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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-sc... 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.