How to test a fuel injector circuit with basic tools (open control wire)

This is an open circuit test procedure using a test light and a voltmeter. Just some simple tools and knowledge of the circuit is needed. Also the procedures shown in this video can be applied to ANY ground side switched circuit.
This video was taken from a 5 part training series I did for my students on various ways to identify a misfire and restricted exhaust testing. You can find this 5 part series here

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.

[ScannerDanner]

This video was taken from a 5 part training series I did for my students on various ways to identify a misfire and restricted exhaust testing. You can find this 5 part series here

[MikesWorld]

I have been a mechanic for over 13 years now. I just want to say thank you because your videos have taught me a lot more than what I thought I know. You are a beast and probably one the best diagnostics people out here I would consider. Keep up the good work and we appreciate the videos.

[ausban]

ScannerDanner you are the man! Super appreciate your tutorials for the common dude to use basic tools. I was able to use my multi-meter and trouble light to trace a bad #7 open, just by watching your video. Saved myself a boatload!!!! Thank you so much.

[davidb.fishburn]

Paul, thanks for showing that, it  is good info. Perhaps you should have explained how the injector circuits work, as i think that not many do understand. I'm a Chrysler dealer tech, and the way Chrysler designed their systems, the injectors get 12v all the time, the pcm turns the ground on/off to turn the injectors on/off. I don't know atm how all the other manufacturers design their injector circuits, but wanted to point that out in the event that there are different designs.

[shanecody]

Awesome instructional video, thank you for making it and sharing it. I had just completed the dreaded plenum plate and gasket repair on a Dodge 5.2, along with numerous other repairs and replacements while in there. I had one cracked fuel injector, so I bought a new one to replace it. It was a BWD (Borg Warner). Got everything put back together, and it was running like complete shit, bad idle, wanting do die, missing, etc. The computer finally kicked a code, P0208, which was the same cylinder that had the brand new injector. Found this video doing research, planning for the worst, even a possible broken valve spring. Well I checked the resistance on that injector, and there was none. Brand new, non working injector. Just replaced it and my truck is running the best it has since I've owned it! Lesson to be learned, don't ever count on brand new parts to be in working condition! Anyways, thanks again for the video!

[FBobby]

Thank you for doing this kinda stuff with the basic tools. I'm still building my Diagnostic Arsenal and watching your videos really showed me how valuable having a Scope and more importantly having the knowledge on how to use it properly can help diagnose problems correctly. But Until I get the ability to buy one. Seeing that there are a lot of good things that can be done with just a plan ole multi meter and Test light is SUPER helpful.

[zappa]

I'd use the term 'technician' lightly to describe the other guy. Why is it that customers need to constantly pay for incompetencies and skill inadequacies of service people ?
Patient is describing a heartburn sensation? ; lets put him on the heart transplant recipient list. crazy
dude, you're a breath of fresh air to the world of automotive diagnostics. Keep it up.

[Viper]

Wanted to thank you for your fathers service in Vietnam. Read in the comments . I am very proud of him and the amazing son he raised . God bless you brother

[mrghiax]

Great video Paul as always. Not being a professional it is really helpful to see these basic tests performed. Thank you for sharing your vast experience and knowledge on this and your premium channel which I have to say offers unbeatable value for money having watched the contents. I never stop learning something new.

[mekanik]

To the guys that are busting my man about his 454 small block, where is your videos on youtube??? G M made a 265, 283, 327, 305, 350, 302, and a 400 small block. But that was before your time. This young man took his time to make a very informative video and you know-it-alls kick him just for your own lack of self respect. Bless your hearts.

[arcadiogalindez]

I continue to say it..you rock.. love the way you analyze things.. and at that with simple tools ..thank you for always throwing little freebies every now and then our way ..

[Aviatr]

Great video on a simple open. This is the kind of stuff that takes maintenance skills to the next level separating the real wrenches from the parts changers. If you want to be a great mechanic who has families sending everyone they know to you and their kids and so on....Be like Paul Danner. He fixed this cat's ride for a fraction of the cost of the computer swap the guy before him did. This customer will be back again for honest service. Paul, keep up the great work, you are setting the example and helping make a good name for the trade.

[hirayaman]

Best video explaining and true oldschool skills - Respect !

[ihpalmerjr]

Great video another thing I can add to my arsenal. I thank you I learn something new every time I watch one of your videos.

[waitingaliens]

Thank you very much for presenting an evidenced based solution in an affordable, fundamental manner.

[MohammedIBRAHIM-iwxl]

THE POST IS PRETTY OLD, BUT I REALLY THANKFUL FOR YOUR DEDICATION SPENDING YOUR TIME AND KNOWLEDGE TO HELP OTHERS. I LEARNED TO DO SOME WORK ON MY CARS BECAUSE OF SOME PEOPLE TO RIP OTHERS

[rrmech]

Thanks danner for your support and tell James we miss him and his famous test light.

[DanielSmith-hhpc]

Thanks Scanner. Simple and to the point.

[gixxercorona]

You make it look so easy Paul 👍, excellent tuition

[blainegourneau]

Thanks. I learned something today and I hope to implement it in fixing a project car I purchased.