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

[@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 www.scannerdanner.com/scannerdanner-premium-chapters/misfire-case-studies.html

[@turbofoedoe]

Thanks for the great info! I have a injector wiring issue on my 2007 jeep wrangler. I have a cylinder #4 misfire. Its reading 14.0 -14.1 only on #4 cylinder. 1,2 3,5 and 6 injectors read 13.6 -13.8 and never reach 14.0. Where could my problem be?

[@victorrodriguez2158]

Do you know of a great mechanic in the 92336 zip code area. I am in Southern California. I have a 2000 Ford mustang v6 with a crank no start, no spark. I have checked about everything, I think, and I am thinking it probably something simple that I am missing. Any help appreciated ¹

[@ScannerDanner]

@@victorrodriguez2158 I have a few shops using my training in southern California. Check out our shop directory www.scannerdanner.com/find-sd-shops.html

[@victorrodriguez2158]

Thanks I just found out what the problem was thanks to your video on crankshaft sensor. I was getting no spark on ignition coil pack but did have voltage on the connector. So checked voltage on the fuel injector with a light probe. The control side was no lighting the probe when I cranked the engine. So I checked the crankshaft sensor by the harmonic balancer. As I was checking the connection, I noticed the teeth weren't underneath the crankshaft sensor and the belt seemed off. After further inspecting the harmonic balancer I notice it was coming out which got the teeth to not be underneath the crankshaft sensor. The bolt holding the harmonic balancer had broken off and balancer was coming off.

[@victorrodriguez2158]

Thanks again

[@MikesWorld211]

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.

[@ScannerDanner]

MikesWorld211 thanks man!

[@knock904]

I 2nd that ✊🏽

[@keithminer5901]

extremally informative... Thank you!!!

[@mekanik911]

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.

[@ScannerDanner]

I'm sorry, what video are we talking about? This one?

[@Viper81766]

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

[@ScannerDanner]

Thanks so much brother

[@Aviatr23]

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.

[@ScannerDanner]

Thanks man!

[@davidb.fishburn9338]

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.

[@ausban69]

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.

[@zappa916]

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.

[@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.

[@MohammedIBRAHIM-iw1xl]

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

[@rrmech11]

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

[@arcadiogalindez6407]

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 ..

[@AaronAcosta410Strategy]

Thank you. I’m not a mechanic or tech not even close. I used your video to learn how to use a multi meter and noid lights and diagnose the injector circuit error code on my Jeep Wangler TJ 4.0L and learn that my injector is good and PCM was good and that the issue was in the harness! So cool! I’m a digital marketer and a marketing director is my day job. So fun working on the Jeep! Thanks doe the video!

[@ScannerDanner]

How awesome is that! Thanks for sharing and nice job

[@Top10mostwanted]

I've always been a nut and bolt kinda guy and would GLADLY pay for anything electrical. I had a p0304 on a GMC Sierra 1500 5.3L so changed injectors then had a connector clip break and replaced it. Only to have it followed by a p0300 random miss. Compression is good but thought there maybe an issue with the way I spliced the connector. Wasnt 100% sure how to test the connector so I found you. Thanks for this so I know how to properly test the wiring. I WAS just gonna unplug it to see if there was a change in the boggy/rough idle or not to tell me if I spliced incorrectly but this is a true way to test. So thank you again for this video friend!

[@waiting4aliens]

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

[@Cattlerest]

Basic tools that helps alot of home mechanics . Wish your book was more flexible and home mechanic friendly. Thanks a million for posting these.

[@ScannerDanner]

It is! Are you struggling to follow it? May I suggest you sit through my page for page teachings of it on my premium channel? I promise you it is DIY friendly and I can fill in the blanks for you. 36 cents per day, you can't beat what I'm offering. Hope to see you there www.scannerdanner.com/join-scannerdanner-premium.html

[@shanecody1737]

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!

[@bazokazoro4563]

Car fundamentals troubleshooting techniques Very helpful and we all Appreciate your tutorial.

[@lupedelacruz4152]

Thank you sir for all that you do for us 🙏

[@Hdhdjdudh-fv5jk]

Ill be praying for u and your family

[@hirayaman246]

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.

[@gunnarbohlin3632]

Thank you, really good tip with hooking up a light to see that there is a signal to the injector!

[@blainegourneau1969]

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

[@AlwaysDiagnoseVehicleFirst]

Good Afternoon Paul Danner and happy blessed Friday 🙏. I have a (2003 Dodge Caravan SE V6 3.3) and its throwing 2 codes (P1684-Battery Was Disconnected) & (P0201-Injector #1 Control Circuit). I have the 2003 powertrain diagnostic procedures book for the code (P0201-Injector #1 Control Circuit) and I have the 2003 Transmission Diagnostic Procedures book for code (P1684-Battery Was Disconnected.) I have taken action and followed instructions from the book that gives procedures for code (P0201) and i applied Test#1 & Test #2. Im on Test #3 now and these are the instructions..... Turn the ignition off. Disconnect the Fuel Injector harness connector. Remove the ASD Relay from the IPM. Turn the ignition on. Jumper the Fused B+ circuit and the ASD Relay Output circuit in the IPM. Using a 12-volt test light connected to ground, probe the (K342) ASD Relay Output circuit. Does the test light illuminate brightly? Yes➡️➡️➡️ Go To 4 No ➡️➡️➡️ Repair the open in the (K342) ASD Relay Output circuit. Perform POWERTRAIN VERIFICATION TEST VER-5. Im not grasping and understanding these instructions as to where i can apply it and take action doing test steps from the book. Are you able to help me grasp and understand this procedure of Test #3? Test #2 procedure from the book for code (P0201) i applied the procedure and i filmed myself applying it. kzbin.info/www/bejne/qGjbnoKqZdqYfc0

[@1776FreedomNow]

at 1:37 theres a note 4 using a test light instead of the noid. do I connect the two sides of the test light to the connector? basically jumping the connector using the test light?

[@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.

[@SteveRobReviews]

Real nice, just a test light and six minutes. Now that was way cool 👍

[@ScannerDanner]

Thanks Steve. I'll show you were the open in I'm my part 5 video on my other channel. It's pretty cool. I guess I should have put that part in here. I just didn't think it was very important in this context.

[@robertferrara4529]

I bought your book. Thank you for publishing it.

[@resindoctor2523]

Thanks for this video, Im going to check my truck like this. Appreciate It!!!

[@gixxercorona]

You make it look so easy Paul 👍, excellent tuition

[@DanielSmith-hh8pc]

Thanks Scanner. Simple and to the point.

[@kevinrendell9770]

Thank you am a old Radio tec years ago You give me and others A refresh a cost on trouble shooting you Helped me with my 90 Fox body neg trigger ing on the injections Now I have to use led s No load test lights Fiber ocs thanks PA Guy kev in ny

[@johndaly846]

Love the Chief's anchor in the background! Go Navy!

[@ScannerDannerPremium]

Thanks man. A friend of mine gave it to me. My dad served in the Navy during the Vietnam war.

[@HardKnocksForge]

ScannerDanner Premium Thank your dad for his service for me.

[@olipirard]

As usual, fantastic. I like the idea of troubleshooting using common tools. This is nothing but awsome. Thank you.

[@kman-mi7su]

Definitely! I don't have one of those expensive scopes, just a multimeter, and a test light. Not planning on buying a scope, not in the budget,

[@michaelhanglow5051]

Very informative, just one point, it took me a couple of times watching your test at the engine computer to understand what you were doing. Sometimes us DIY’rs who are still learning need the information fully explained to us , step by step. I finally figured out the test results at the computer, when I broke it down to a simple electrical circuit. Just my 2 cents. Excellent video none the less. You are a great human being, helping the average person to diagnose and fix their own car. God bless.

[@rafalkowalski5062]

Warm greetings from Poland. I am watching Your Videos and still learning to fix my 88 pontiac Firebird no injector pulse problem. 12 on power side and 8v on signal side with key on. Thx for very goood videos.

[@ScannerDanner]

That's not right. With key on only, you should see 12 and 12, not 12 and 8 You're firebird is a group fired injection system and one shorted injector can cause all of them to not fire. I have some videos on these, let me find them...

[@automotivediag8502]

Great explanation! I have a buzzer that I hook up at the PCM in this situation, often allowing a quick wiggle test to pinpoint the open in the harness in case it's somewhere I can't see the scope/meter. Great work!

[@K1Vernon]

If the plastic of the wires going to the injector plug is cracked open but not touching each other or the ground(Body of engine) could this still cause a small misfire during a cold idle? When I say small misfire I mean a misfire that does not register on the ECU of vehicle just like a slight stumble as if an injector gave too much or too little fuel.

[@rgreeneish]

Thank you, you may have just saved me a lot of money. 2010 mercury Milan intermittent misfire. I may have a bad PCU since it seems to work when it's cold and misfire after it warms up. But at least now I know how to check and verify.

[@ScannerDanner]

Intermittent misfiring is typically ignition related

[@MichaelJohnson-]

Great video. I have a misfire on my 2013 x5 n55 engine and I just verified that injector 5 was bad by testing each connector, and I got the same .485 volts across each plug with key in on position. I'm going to run the same test on plug 5 with engine on this time and verify against cylinder 1 if the same voltage is coming through. Thank you.

[@PutPup]

Just goes to show ya..... Question everything and never feel embarrassed or guilty to get a second opinion or even 3rd for that matter. Whether it's your mechanic's diagnosis or your doctor's diagnosis that you're not sure of, get that second opinion. 🤔 Especially if you have your mechanic diagnosis your health or your doctor diagnose your car. 2nd opinion folks!

[@dohc22h]

Ive said it before... and I'll say it again. This information is GOLD. I'm forever gratefull

[@ScannerDanner]

Thank you my friend!

[@RAFICKDAMISONMOYO]

Another Wonderful Troubleshooting skills and experience

[@NOBOX7]

Wow . you realy are scanner Danner, and that was the best dam scannen to make some good planen ive ever seen

[@SeanHollingsworth]

I have a 1998 buick with two of the injectors not pulsing. I did already replace all 6 injectors myself. Cheap and easy, and took under an hour. It appears that I need to start digging in the harness for an open connection. . . Electrical problems.can be such a time such. . . Grrrrr!!! ;-)

[@chrispurkiss3399]

WOW i have been looking for a simplistic video for testing injector pulse, for 2 day's now and came across this video, and with the majority of the other video's i've seen i was left thinking there has got to be an easier way to do this , then i found this video , this looks like what i was looking for i will try this tonight and if its really this easy and this technique gets me an acurate result i will be subscribing shortly after!. love the simple approach!

[@motojaknow2612]

To find an open or a short in a wire, Power Probe's circuit tracer works well. It is unique in that it switches from tracing E field (voltage, open wire) or H field (current, loaded or shorted wire) as needed and LED even indicate direction of current flow. No, I don't work for PP, I'm just a satisfied customer.

[@jonminnella2168]

There is no excuse however if the employe of the shop doesn't pushes tech to be professionals and if he grooms them to just be Parts changers then this is what happens a real mechanic knows exactly how things work and knows exactly how to troubleshoot there's a big difference from people who just throw Parts at something and people who actually know what's going on this is one of the reasons why I got out of the trade when I was in the trade there was no respect for people who knew what they were doing it there was a lot of respect for people who change Parts because people will change Parts make the shop money there's a fine line there and business owners need to learn how to walk that line good job with this video I appreciate you showing how some simple steps when troubleshooting can resolve head-scratching problems I repaired a similar problem last night on a friend's car it's been 17 years since I put my hands under a hood yet I knew exactly where to look because I have the same attitude as you you don't always need to have all these fancy tools you just need to have some common sense and some troubleshooting skills

[@train4905]

Abdolutely superb sir.thankyou steve from the uk.

[@dustyhedger380]

Proper test procedures save time and money .

[@luisperez1007]

excellent video! I just found the solution of my problem!

[@salvadorgutierrezr5914]

Thank you scanner danner good video, for us that don't have a scoop👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

[@RayHoldridge]

Awesome video!

[@jamesprice6381]

you are NAVY...nuff said! USN retired J Price

[@michaelszweda]

thanks paul every little bit helps

[@ozzstars_cars]

Quick and easy, thanks for the video Paul

[@ScannerDanner]

Thanks brother

[@tammielewis3574]

@@ScannerDanner ????????

[@new_comment]

Nice, now tracking down the wire failure is the big headache

[@davekinjorski548]

Thanks for the video, if I'm ever in your town dinner is on me!

[@rrmech11]

Hey Paul. Nice refresher. Keep up the the good work. I'm gonna subscribe again.

[@ScannerDanner]

Thanks Richard!

[@michoacan91davi]

What’s the other channel

[@EXOVCDS]

Nice one! Don't forget to also check the noid light before using (or at least on a couple of cylinders like you did) ... almost got burnt one time thinking that I had a control problem, when in fact the light was bad.

[@ScannerDanner]

Good point brother thanks!

[@Turbotomass]

***** another thing to keep in mind is that the computer will not control the injector with a misfire or fault. Obviously not the case here as there should be 12v to the PCM. Me personally have spent good money on diagnostic equipment. Granted in this circumstance you don't need fancy tools. To do diagnostics and not have advanced tooling doesn't make any sense. You can't make "100% calls".

[@EXOVCDS]

Turbotomass Good point... on older systems it'll still fire the injectors. A glowing cat will verify that! LOL

[@davidpaterson2130]

***** Too right: THE fundamental of using any test tool is to first ensure that it works!

[@davidvonanderseck8649]

Thanks this really helps

[@train4905]

Absolutely superb sir, Thanku.very helpfull indeed.

[@willk3807]

I have a 350z...has P0304 misfire code. I switched the coils, plugs, injectors around. No change in misfire code. When I tore the engine down I found the factory fuel injection harness had butt connections instead of an actual factory plug. I'm guessing it's the wire harness. The VQ35de engine has the injectors hidden under the plenum. So it's gonna be difficult to run this test. I'm just gonna throw a $185 wiring harness on it and hope for the best. Thanks for this video. It made me confident this is the problem I'm having

[@dustinlaferney3160]

very adept troubleshooting.

[@ekimbrough1413]

Mnnnp. Never thought about using my noid lights for injector pulses! Another great video!!!!

[@pedrorodriguez2778]

NICE TIP PAUL

[@jeeperscreepers8834]

I have this same Problem. Thanks for the help Paul

[@mckoylach1622]

Helo Danner, I like to know this method of diagnostic more, so if there are more videos like this to show. . . I appreciated, thanks. . .

[@ScannerDanner]

I have around 400 videos on this channel and another 340 on ScannerDanner Premium. I am certain you will find exactly what you are looking for if you continue to follow me. Thank you!

[@domingodeanda6113]

That was pretty damn good, thanks.

[@geojor]

thanks for your expert teaching...

[@travislovely944]

thank you thank you that was free and it f******* works

[@ScannerDanner]

awesome! thank you

[@area46241]

Hey I got one for ya...friend had knock sensor code all he had was the powerprobe short checker..I used meter to check for bias...no bias then used meter to check wire to computer with continuity beeper...was beeping on a dozen wires... then used short checker and it was shorted....... after engine swap somebody found a loose blue wire and grounded it...the short checker was invaluable along with bias knowledgeThanks scanner danner! I need your book.

[@ScannerDanner]

area46241 awesome! thank you. my book is available through my website www.scannerdanner.com I have it in paper form and as an eBook. Nice job on your friends car and understanding how to use bias voltage

[@johnboy1732]

nice find and big help for me has my bmw same on 8 cylinder not firing thx for showing this

[@u.s.a.198]

Thank you!

[@Carlostype]

Cool informative and humbling 👍

[@LucianoJuly]

Real skill!

[@wtbm123]

very good video

[@hyselwatchandclockrepair1874]

Thanks so very much!

[@ScannerDanner]

Glad it helped!

[@hillsofva739]

Great show brother

[@powerpower1797]

Good video.

[@xZENxSAMURAIx]

Awesome video

[@marcoscifuentes876]

Great video. Thank you!

[@Johnwilliams-yi9xc]

Thank you.

[@Assasain31]

Hey ScannerDanner! I’m trying to diagnose my own vehicle and would love some insight Cyl 4 misfire, ignition is good but it looks like no fuel is getting to that cylinder, swapped out injectors and moved them around and still at cylinder 4. The spark plugs were replaced and you can tell that the 4th cyl plug looks brand new still. So, this leads me to think there is an open circuit somewhere between the ecm and the fuel harness, what would you do in my position?

[@stephendonophan6750]

Thanks for this. Currently trying to resolve a misfire issue where spark is present and the fuel injector seems to be firing when listening to it through a hose.

[@ScannerDanner]

Check compression too

[@DJDevon3]

Great video for the DIY'er. Score!

[@ScannerDanner]

Thanks!

[@joseluiszapote2634]

Good job

[@marvinbenson9631]

Thank you sir

[@arctican7483]

GOLD!

[@habatroll4831]

Paul thanks for the video. Great tips on using some basic tools.

[@grzegorz16100]

I have vantage pro now!! Bought it second hand but looks fine. I will consider resubscribing to your paid channel now:)

[@ScannerDanner]

Awesome. Your are going to love that database! That tool will also be your teacher for sure. Email me Greg and I'll give you a coupon for a free month when your ready.

[@grzegorz16100]

ScannerDanner Thanks

[@grzegorz16100]

I'm also considering buying a second hand solus pro. They are very cheap here in UK.

[@grzegorz16100]

Funny thing is that the guy who sold the scope to me said that he doesn't need it anymore as he bought a scanner now?! ;)

[@ScannerDanner]

Lol typical. Bonus for you though because you know better

[@alejandrosantacruz5379]

Nice video!

[@mazenramadan493]

Thank you thank you thank you

[@Johnwilliams-yi9xc]

I'm not going to be a parts changer.🙏👌. Thank you.

[@blackericdenice]

You got me hooked on you and now I have to pay. O well, guess I will take what I've learn and say good day sir.

[@ScannerDanner]

I didn't leave you with a cliffhanger here. No reason to get upset. I've had this paid channel for over a year now yet i still give out free and valuable information here for nothing. What I offer on my paid channel is college level training for next to nothing. You don't have to subscribe, no one is forcing you. And then because you're pissed off you leave some b.s. comment about my brother?

[@blackericdenice]

ScannerDanner I'm not piss off because I've learned a lot from you for free. Thank you very much but your brother is boring.

[@OneSierra]

considering all the work (countless hours I'm sure) that he puts in to help us diagnose and gives it to us for free. I'm very appreciative and i want to say thank you.

[@blackericdenice]

J. Stewart Seeing u like the end of my name, why don't u try the rear end of my @

[@ScannerDanner]

Thank you

[@davecox3583]

Props man, where are your classes located? I would really like attend your classes. Great teaching skills. Well spoken.

[@normanness2589]

info was helpful

[@LAU3768]

👍👍👍thanks for your sharing

[@dalev1319]

Fantastic information! What controls the injection drivers?

[@ScannerDanner]

Engine computer

[@nickayivor8432]

Enjoy your evening with all your family around you,Sir ScannerDanner My teacher 👍 QUICK-WITTED,Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧 ⏰️ 21:56PM Good Evening

[@kevingore3588]

great video help me find my shorted out injector harness but I still have a po205 injector controller issue i even replaced the injector but i still have the problem can i use a volt meter to test and see if the pcm driver is working properly

[@ScannerDanner]

The voltmeter won't be the best tool for testing the computer driver. Use a test light