In this video I will show you how to test for spark, fuel pressure and injector pulse as well as how to test the engine main relay for proper operation. The vehicle is a 2005 Chevy Equinox with a 3.4L engine and the main relay (which supplies power to the fuel injectors) is not turning on.

Engine Performance Diagnostics chapter 3

Symptoms
- engine cranks normally but will not start

Fix
- repaired damaged wire going to the engine main relay

Tests shown
- how to test for spark and injector control using a test light
- how to test fuel pressure
- how to test the engine main relay
- how to test a computer driver
- how to locate an open wire in a harness
- how to repair a broken wire
- how to test a relay

Tools used
Visit my Amazon Store
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- uActivate Circuit Performance Tester [ Ссылка ]
- uTest Advanced Terminal Test Kit
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Related videos
- No start troubleshooting (fuel pressure, injector pulse, spark) - GM OBDI
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- No Start, No Spark, No Injector Pulse (faulty crank sensor)
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- No Start Diagnostics Training at RTC (a ScannerDanner Premium video)
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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 [ Ссылка ] 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.

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