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?

[@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.

[@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!

[@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!

[@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.

[@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 ..

[@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.

[@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

[@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!

[@lupedelacruz4152]

Thank you sir for all that you do for us 🙏

[@Hdhdjdudh-fv5jk]

Ill be praying for u and your family

[@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

[@bazokazoro4563]

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

[@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.

[@hirayaman246]

Best video explaining and true oldschool skills - Respect !

[@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.

[@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.

[@blainegourneau1969]

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

[@gunnarbohlin3632]

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

[@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.

[@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.

[@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

[@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,

[@gixxercorona]

You make it look so easy Paul 👍, excellent tuition

[@resindoctor2523]

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

[@DanielSmith-hh8pc]

Thanks Scanner. Simple and to the point.

[@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...

[@chuxxsss]

I have been watching you first a number of years. Congratulations on the channl. From a guy with a Oscilloscope.

[@ScannerDanner]

Nice. Then we speak the same language :)

[@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.

[@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.

[@user-uj1xg7hb2u]

Another Wonderful Troubleshooting skills and experience

[@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

[@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!!! ;-)

[@dustyhedger380]

Proper test procedures save time and money .

[@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

[@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.

[@NOBOX7]

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

[@salvadorgutierrezr5914]

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

[@jamesprice6381]

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

[@train4905]

Abdolutely superb sir.thankyou steve from the uk.

[@dohc22h]

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

[@ScannerDanner]

Thank you my friend!

[@luisperez1007]

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

[@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!

[@michaelszweda]

thanks paul every little bit helps

[@dustinlaferney3160]

very adept troubleshooting.

[@ozzstars_cars]

Quick and easy, thanks for the video Paul

[@ScannerDanner]

Thanks brother

[@tammielewis3574]

@@ScannerDanner ????????

[@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!

[@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

[@geojor]

thanks for your expert teaching...

[@davekinjorski548]

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

[@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!

[@u.s.a.198]

Thank you!

[@new_comment]

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

[@turkeybasterlove7730]

This was suggested to me. Not sure why? Simple think out side of box. Noid lights in my opinion are a waste of money. Just use a bulb. For example the common 168, 194, or 912. Bend the contacts down. The wire is small enough that it makes it difficult to damage a connector from front probe also small enough to back probe. If you broke or lost your homemade noid light. It is not expensive to make another. What's the cost of a 2 back of 168 bulbs in your area? Simple circuit diagnostics is where the break down begins at many shops. At least the customer got a second opinion which I always recommend if it doesn't seem right. More importantly a perfectly good module was not replaced. Keep teaching and preaching test before you put a part on!!!

[@travislovely944]

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

[@ScannerDanner]

awesome! thank you

[@hyselwatchandclockrepair1874]

Thanks so very much!

[@ScannerDanner]

Glad it helped!

[@LucianoJuly]

Real skill!

[@rrmech11]

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

[@ScannerDanner]

Thanks Richard!

[@train4905]

Absolutely superb sir, Thanku.very helpfull indeed.

[@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

[@Johnwilliams-yi9xc]

Thank you.

[@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

[@davegallucci9327]

Thank you

[@arctican7483]

GOLD!

[@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!

[@jeeperscreepers8834]

I have this same Problem. Thanks for the help Paul

[@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

[@davidvonanderseck8649]

Thanks this really helps

[@pedrorodriguez2778]

NICE TIP PAUL

[@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?

[@johncase2031]

I really dig your viseos they're very informative and ive learned a couple things watching them, but how do i go about testing the injectors when they are sandwiched between the lower plenum and the intake manifold? I have a 01 Nissan Pathfinder 3.5 4x4. If you can give me a couple of pointers or a direction that i need to go in to accomplish this task. Thanks in advance.

[@mazenramadan493]

Thank you thank you thank you

[@domingodeanda6113]

That was pretty damn good, thanks.

[@marvinbenson9631]

Thank you sir

[@johnboy1732]

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

[@davecox3583]

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

[@xxbab3fac3xx]

Wouldn't be this test same as performing a continuity test between injector wire connector unplug and at the computer connector wire also unplug pin to pin ? To check if there is an opening if there is continuity then there is not opening or would a wire show continuity no problem but a slight opening big enough to be causing current to drop but just good enough to pass continuity?

[@thesetruths1404]

2007 Jeep Liberty, 3.7L. Have code faults for #1 misfire, fuel injector 1 circuit open, and Bank #1 lean. There is a slight rough idle, but no misfire perceived, and it runs fine under load and high speed. Doesn't burn oil. Gets 15mpg combined mileage. Ran fine when I got it 64,000 miles. Now it has 110,000 miles. It has had this issue for about 10,000 miles. Not getting worse, but so far plugs and coils and cleaning intake hasn't corrected it. I checked and cleaned Injector and Coils wiring connections and they look good too. #1 Injector plug had some oil in it, somehow. Cleaned it very well with first brake cleaner, then electronics cleaner. Let it dry and reassembled. Can bad Injector o-ring cause this? I already ruled out spark plug, coils, valves, and did intake cleaning. I have not checked orings and the wiring from #1 Injector to the computer control. And don't really know how to. Any tips on checking Injector and its wiring and control while it's still in the head? Thanks!

[@ScannerDanner]

injector circuit code is where you need to focus. This is an electrical issue with that circuit, nothing else will set that code. Do the test light tests I showed in this video.

[@thesetruths1404]

@@ScannerDanner the P0201 code, injector circuit/open? That would make sense as the plug was filled with oil for some unknown reason. No leaks or spills that I know of. I cleaned it twice and the P0201 went away but the #1 misfire and Bank 1 lean code is still present.

[@Carlostype]

Cool informative and humbling 👍

[@RobertSmith-kv1ur]

If u unplug the injector harness testing each idevidual injector plug and each little prong in them if u test them all and only get light off 1 prong but test another and get light off both prongs whould thr be a short in the harness itself

[@Johnwilliams-yi9xc]

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

[@marcoscifuentes876]

Great video. Thank you!

[@petar443]

Is it also possible to do a 'continuity check' between injector control wire pin and the ecu pin using multi-meter?Ain't the same thing?Great videos man!

[@petar443]

Also if in this situation we HAD 12v at injector and 12v at the computer this means that the harness is good and injector is good AND THE ONLY thing left is the ECU which is not grounding the circuit(engine running) then the injector needs to spray fuel, am i right?

[@ScannerDanner]

you could do that, but the more you watch me, the more you'll see how much I hate the ohmmeter and why

[@ScannerDanner]

This one had an open wire, not a faulty computer. Also, if you find a computer that is not pulsing the injector, it may be doing so to protect the converter from a misfire, so there are other variables.

[@wtbm123]

very good video

[@ekimbrough1413]

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

[@diydantex6150]

Is it likely that a control module would be intermittent? I have a negative pulse sometimes but mostly no pulse. The car is in a parking lot and i didn't have a diagram to find the pin on the ECM. Trying to decide weather to tow to my house or a shop that can program the ECM 2011 Corolla. I am guessing that the ECM would be permanently bad if it was the problem.

[@stilllearning6035]

Mr Danner big fan of yours....bought your book and following along....have 95 buick crank no start....garage threw f pump, ign mod, and crank sensor....called me and politely told me car was at end of its road...can't get it started get it out....I have only basic tools....no codes I have fuel pressure...need to know testing sequence from there...thx....my plan is to get it running and take it back for an oil change

[@ScannerDanner]

Check it for spark and injector pulse. See what you're missing, then we go from there

[@stilllearning6035]

@@ScannerDanner no spark no injector pulse...going to check ignition module next.....correct? I have gm factory shop manuals

[@ScannerDanner]

@@stilllearning6035 when cranking, do you have an rpm signal on the scan tool? Need to check ignition inputs (chapter 21)

[@ScannerDanner]

@@stilllearning6035 i have some videos on this system too, right here on YT (chapter 21 playlist)

[@stilllearning6035]

@@ScannerDanner no scan tool... multi meter and test light that'sit....rpm gauge on dash doesn't move or flicker when turning over

[@mokarrommolla5820]

Hey buddy ! How can I find the wire from the compute that you tested to see if there is voltage . Can I learn this ? How can I make sure the wire I am looking this is the right? I really like to learn this stuffs. Thanks

[@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

[@hillsofva739]

Great show brother

[@theFr4nch1zE]

Scanner Danner, could we have back-probed the control side wire of the injector plug (or front-probed it with the injector unplugged) and used a test light connected to battery positive and watched to see if it lit up when the vehicle was running in order to verify that there was no signal reaching it (i.e., it being intermittently grounded out by the PCM signal/pulse. Is this the other procedure you were referring to in the writing on the bottom of the screen in the video without using a noid light, but just didn't show us)? Also, are there any other tests that we could use to verify that there is an open in the control wire, without back-tracing the wire to the PCM/firewall? (I'm assuming that if we didn't have ready access to the wiring diagram, that the wire you're checking coming from the PCM would be the same color of wire that's coming from the control side of the injector connector?) Thanks!

[@dalev1319]

Fantastic information! What controls the injection drivers?

[@ScannerDanner]

Engine computer

[@MrHC1983]

Ah over my head it went. I have a similar thing going on....... and I've tested the wiring on the harness for connectivity and that was fine, I tested it back to the ecu and that was fine but where the injectors are I can't test the electrical side as they are covered when the engine is running on this. I'm not sure if I have a test light but yeah... I'm stuck it's a v6 direct injection and I got banks 4 and 6 misfiring.... changed injectors, changed plugs.... have not done a compression test yet but they were fine before doing the new injectors so I presume..... it is injectors? or wiring...