ignition coil driver

In this Video we diagnose an engine only running on 5 out of 6 cilinders.
We diagnose it, and learn it has a bad ignition coil driver!
I explain how a Mosfet works and we do some measurements/tests to learn more about Mosfets!
I hope this video helps and remember;
Diagnosedan fixed it again!
Also take a look at the Diagnosedan Facebook page!

[@PineHollowAutoDiagnostics]

So cool, Dan! Love the in-depth explanation on the whiteboard of knowledge :) A couple questions:1) Since MOSFET driver is controlled by positive voltage on the gate, how do you know 100% that the ECU chip was damaged by the shorted MOSFET?2) How did you take care of the "immobilizer issue"? Please show us!3) I must admit that is a beautiful clean BMW...how does it look brand new?

[@Diagnosedan]

Pine Hollow Auto Diagnostics , I tried to repair the board with a new mosfet. after replacing I checked but there was no control anymore! Most of the time there is more damage than just the mosfet😢. If you are really interested in what i did with the immo, you can sent me a PM on my diagnosedan Facebook page! Thanks for the comment buddy it's appreciated!👍

[@OzMechanics]

hey dan i also want to know about the immobilizer. please share

[@smms1276]

Sweeeet

[@sinegra30]

+Pine Hollow Auto Diagnostics Hi Ivan! Well Most CPU's work with a maximum 3.3V if you consider that the Mosfet was shorted and the history of the car said that it had a shorted primary coil winding then we can assume that +12V power coming from the coil circuit went trough the signal ECU wire and then through the shorted Mosfet getting at the end to the CPU circuit and burning it. The shorted primary coil circuit and the shorted Mosfet both became a bridge or road for the +12V to get directly to that CPU. Cheers Ivan!

[@cesaralbarracin8070]

Todo. Oke

[@aristotlekarimalis4402]

Way too many shops that just scan the car and go right to replacing parts (basically guessing). Very refreshing to see a well-thought-out, methodical approach to finding the problem!

[@Diagnosedan]

Thanks for watching!

[@zxtenn]

This is an EASY one for him, did you see the BMW with the no start due to a shorted door handle? Other shops charged the customer like 3000 euro and still didn't fix it, not many even close to this guy

[@rasputinputin8103]

I will show you.... Immobiliser... reset. kzbin.info/www/bejne/q3zNk6qVgd59ntk

[@Carlitosway211]

I just had a Subaru in my shop that was towed in from the dealer due to dying on the highway and not restarting. Dealer quoted him an engine at NINE THOUSAND DOLLARS!!!! I scope the coil drivers, cams and crank. The cams and crank look good. The coil drivers are all over the place. Just needed an ECM. *Superman theme plays in background*

[@joseantonioperez8273]

Professional, exact and reliable those are the thoughts coming to my mind when I watch videos like this, however, the knowledge of the tools, components and computer's architecture requires time, patience, a lot of money but overall an excellent teacher to be reached, once again great job Dan!

[@ferenctulics9688]

A another great lesson! You should teach at a school somewhere, you, sir, have a natural gift in explaining things!

[@Diagnosedan]

I teach in the biggest international school in the world here on KZbin.

[@ferenctulics9688]

@@Diagnosedan I should think that way. You are absolutely right!

[@dominicdo]

Your instructional videos are still top notch and I thank you for taking the time to educate people.

[@Diagnosedan]

Thanks for the comment Christian it's appreciated!👍

[@byronbaker1491]

I desire the kind of relationship you have with your test equipment I appreciate you sharing

[@Diagnosedan]

👍😊

[@CubasAutomotive]

WOW!!! What an amazing demonstration with the mosfet! I had no idea they were so sensitive. Your teaching technique is truly wonderful!

[@Diagnosedan]

Thanks Miss. Rodrigues 😁

[@rasputinputin8103]

I will show you.... Immobiliser... reset. kzbin.info/www/bejne/q3zNk6qVgd59ntk

[@ozzstars_cars]

Great video Dan. You did an awesome job explaining how mosfets work by using your heavy duty nipple clamps as a way to apply a power source. Thank you friend!

[@Diagnosedan]

Ozzstar! Don't tell everyone about my fetish😜

[@bubbsy2002]

HI Dan, it's amazing that the PCM even functioned at all after taking high amperage/voltage, thanks for the in depth explanation. Electronics was my favourite shop course in high school and you brought back good memories with that MOSFET, break down.

[@rasputinputin8103]

I will show you.... Immobiliser... reset. kzbin.info/www/bejne/q3zNk6qVgd59ntk

[@movingupautodiagnostics8645]

I freaking love this video Dan. A++++++ Thanks for explaining and showing us the mosfets.

[@Diagnosedan]

Moving Up Auto Diagnostics your welcome! Thanks for the comment buddy it's appreciated!👍

[@rasputinputin8103]

I will show you.... Immobiliser... reset. kzbin.info/www/bejne/q3zNk6qVgd59ntk

[@mike-yp1uk]

I save videos that I want to watch more than one time. This mosfet transistor made it perfect. You dive deep into stuff. I know tons of great mechanics that don't know anything about a mosfet but the produce great work. They don't want to waste their brain cells or time they can be drinking beer. Lol.but not me I'm cursed, I have to know or I can't be fast and confident in my work. I've been a scanner Danner follow forever but this channel shows excellent content that gives great visual aids and there in lies my second curse. I need visual aids to have it sink deep. I just love fixing cars so it makes all the countless hours of study worthwhile. I greatly appreciate your great teaching efforts. Your videos are better than watching TV.

[@stradcar1]

Dan you are a teacher. I will be watching all your vids

[@Diagnosedan]

😊👍Thanks!

[@nicknicu1787]

Great video Dan! I can't believe the other shop sent the DME for repair and they told them it is working properly! I have to say you are doing an amazing job with these videos : you've got humor, knowledge and great detail! 👍👍👍 Thank you so much for the videos!

[@Diagnosedan]

Nick Nicu Thanks for the great comment it means a lot to me!😁

[@luispadilla1398]

Great video, thanks for explaining everything in detail, been working on cars for many years and I never stop learning new things, thanks again!!

[@Diagnosedan]

We all learn new things every day!

[@EE-hk8iu]

i watch a 3 minute ad on purpose without skipping ,since u r a great tutor.

[@briankotze57]

When u diagnose it seems so easy and obvious that it seems that other shops just dont know what they are doing. But the main thing is the scope. Without a scope on modern cars you are a bit lost. I think most tech's think you just plug in a scantool and the car will fix itself.

[@Diagnosedan]

brian kotze very true! scantools only point you into a certain direction! The diagnosing starts after reading the codes! And a scope makes you see what's happening!

[@NewLevelAuto]

Wish I could hit that heart button too

[@stanleytolle416]

Could use an old fashion tac. or rpm meter. That would tell you that you are getting signal to the coil or not. Testing the CPU should have shown a bad coil driver. The first shop at this point was dumb founded of course. They most likely tested the wire to the coil and it was good too. I guess that's politics today. You can't trust what anybody tells you, even when you pay to have the truth told to you.

[@voitano73]

Hi, thanks for another repair video. And we would like to know, what company did check the ECU and returned as good. Becouse they failed....

[@djr3485]

Diagnose Dan fixed it again! These videos are in a class of their own. Nice to see some quality, intellectual content still out there instead of click bait and opinion pieces.

[@Diagnosedan]

DJ R Great comment! Wow Thanks!💪

[@Theag393]

Your videos and content are so good that I already put a like before seeing it because I know it is going to be GOOD. Continue your excellent work. God bless you.

[@Diagnosedan]

Ha ha awsome, Thank you!

[@billrimmer5596]

The demonstration was fantastic. It takes a lot of work to set that up!! I’m rewatching a lot of the old gems. I c u have the same M12 ratchet I have. Light and fast.

[@RR-bt5xv]

great video .would have liked to see how you took care of the immobilizer

[@Diagnosedan]

R R 😉🙈

[@crockettt1]

I would also like to see how the immobilizer works are you able to show that to us or is it not legal

[@donmoore7785]

Seems pretty obvious the PCM needs to be programmed somehow with a code or the VIN, and it is a security feature that isn't for the public to know.

[@jackharris1039]

Years ago i built and tested computers. We would fix them by replacing the components. Your video was very informative. Ver well explained. Very complete.

[@xxtriplex95]

You are pure gold! Subscribed! I have theoretical applied and know about those parts in faculty but not in practice.

[@Diagnosedan]

Thanks for the nice comment and Subscibing it's appreciated!👍

[@patrickkeefe8231]

Not everyone has this diagnostic ability. Exceptional!

[@tserevenad]

I would venture to guess only 10% of mechanics have this skill level. I have never personally seen one in real life.

[@zach914v8]

Dan, you are the man! I have been an automotive technician for 17 years and everytime I watch one of your videos I learn something new. Thank you!

[@Diagnosedan]

Ball Zach That's great and exactly the reason why i do these video's!

[@tylerlarecy2949]

Dan your my new bmw go to guy you know your stuff very very knowledgeable you are my new favorite channel better than a professor from a university keep it up helping humanity evolve

[@Diagnosedan]

Ha ha,Thank you Tyler!😉

[@xerxes456]

absolutely great Dan, one of the top 3 channels and great bonus Euro cars

[@Diagnosedan]

g johan, Who are the other 2?🤣🤣

[@xerxes456]

S and E

[@Shamus71]

g johan ScannerDanner and ETCG? I agree.

[@xerxes456]

ETCG started all was not bad.............. Scannerdanner South Main Auto Eric O top 2 Dan 3 Ivan close to third

[@Shamus71]

g johan OldSkool Funk is pretty good too, he’s great with doing things on the cheap.

[@ionutoancea5608]

Thank you Dan for your great work and for the time to show us :how to diagnose. Respect.

[@mikechiodetti4482]

Good in depth explanation of the output driver from the PCM.

[@facesmasher4216]

👌 very clever fix, now .. where's the inmobilizer fix video❓

[@Diagnosedan]

Not there 😉

[@facesmasher4216]

check this out: E36 immo by pass/ r/r with older brown bosh ecm test kzbin.info/www/bejne/pp-1aISCZ69jd5o

[@cdman78564]

Legally he cannot show you this fix but I believe it involves switching out the data proms

[@faygoschnick8307]

Dan is so clever in understanding these problems

[@PaulC1980]

I wish I had your knowledge and experience, just amazing

[@Diagnosedan]

Thanks!

[@markblundell9461]

Awesome vid. Basically a mosfet is a form of relay. I have never come across them before in my motorcycle world. Good knowledge passed on. Thanks.

[@sivucit]

WOW.. Excellent Explanation Dan. All these times I can see paper or theory about mosfet and transistor. This is the first time i can see thru my real EYES. :). Best Video ever seen. You are top notch.

[@Diagnosedan]

Thank you😊👍

[@kanalnamn]

This video made me change all my ignition coils to new ones last year. Don't want problems with computer or coil drivers. (Also E36, and same engine)

[@1hlyGOD]

Great video! Thank you for time and for sharing

[@Diagnosedan]

Drews Auto Thanks😁👍

[@ferencszabo3504]

That FLIR was a sawy idea for sure.Great work. The immobilizer fix would be handy too😁

[@terminaldiagnostics5576]

Good diag and you explained mosfet very well pitty you couldn't solder another one in and repaired it you are an extremely talented technician

[@Diagnosedan]

David Lee Bennett, No like i told in the video the bad Mosfet was not the only problem!😁. Thanks for watching!👍

[@jeremystone6613]

I watched this for the second time today a year later and I still pulled some learning out of it as I dealt with a shorted coil on a Jetta that caused crank no start this week! It was easy to find thankfully as a new fuse created a smoke signal for me 😂. Never yanked a fuse so fast in my life! Next one to help my diag thinking Is your BMW O2 sensor video as I have a n46 b20 that has lean codes.

[@chrism5433]

Nice to hear that you order all parts properly. No messing about 🍺🍺

[@piotrk5308]

VERY COOL DIAG! EVERY TIME I WATCH YOUR VIDEO I LEARN SOMETHING NEW.

[@Diagnosedan]

Piotr K Thats Great!😉

[@bradleighboshoff4016]

Hey Dan I like how you loosen the nut near cyl 5 on the cam cover , but there was nothing there . Great channel , great trainer

[@patelvivek4888]

That thermal gun application was awesome, Great video 👍👍

[@pwkish]

Brilliant video. Love your teaching and explanations making what could be classed as complicated, understandable. Great to see what happens inside the 'black boxes'.

[@Diagnosedan]

pwkish Thank you sir👍😁

[@rasputinputin8103]

I will show you.... Immobiliser... reset. kzbin.info/www/bejne/q3zNk6qVgd59ntk

[@stephenmarshall5302]

cool. nice to see the mosfet visually instead of imagining it.

[@Diagnosedan]

Exactly, we are visual learners!

[@OilBaron100]

That was a great video Dan. Really thorough, especially when you dismantled the DME and explained how it worked.

[@landonthompson5604]

Excellent job on solving and teaching the steps to take to achieve the RIGHT diagnosis, I bet either the coil was zapped out or the sparkplug had such a overextended gap so the coil was being made to overwork itself hence frying the driver for #6 ignition coil.

[@Andrew-ry7iw]

Finally, somebody on KZbin who knows what they are talking about

[@Diagnosedan]

Thank you but i'm pretty sure there are more than one persons on YT who know what they're talking about🤣🤣🤣

[@anthonyhallam4762]

I had this problem a few years ago on my old E39. It had a cooked coilpack. After replacing it to no effect (lol) and then a lot more learning I only got as far as it must be the ecu. Now I understand the system a bit better and what went wrong. Superb explanation, thank you!

[@Diagnosedan]

Thanks for the comment buddy it's appreciated!

[@glenmerwyn5195]

Awesome bro. Thanks !! 👍 I love how you actually showed us in full how to fix it, you didn't just stop. Great !!

[@umarslatif]

My gratitude to you Dan.... Excellent handholding all the way. Thanks

[@Diagnosedan]

Thank you Umar.

[@maggierice2396]

What a pleasureable learning experience !! At last the ' Inner Sanctum' has been entered - a practical view of the wonderful world of the PCM ! I look forward to further revelations ..... Kind regards

[@Diagnosedan]

Maggie Rice Thanks!😁

[@hulksmash8942]

Damn Dan...you're the greatest Technician I've ever leant from...I've learnt more from one of your videos than the years of studying autotronics. ..this video brought back memories of a e46 320i m54 engine I had, luckily for me coil number 6 just shorted down to ground and all I had to do was replace it . ..but through your video , I now know how to go further into detail. ...I thank you for educating me. ..signed : life time subscriber. ..🤘

[@rasputinputin8103]

I will show you.... Immobiliser... reset. kzbin.info/www/bejne/q3zNk6qVgd59ntk

[@turbojoe2]

DiagnoseDan is awesome! He knows cars and electronics! Freakin rare eh! Makes me want to play with my Megasquirt ECU again!

[@Diagnosedan]

Thanks you! Thats awsome comment 😉

[@turbojoe2]

Cheers from Canada @@Diagnosedan!

[@quadxmxguy4285]

Thanks for the explanation. My truck was having an issue of no ignition spark causing it to not start at all, after replacing all ignition parts the ECU was the only thing left. I sent it to a company that repairs them and they said it had a bad ignition coil driver. So they replaced it. I hope that solves my problem!

[@thedude4632]

Dang we sh you were around here , I’d get you to wire up this efi 302 ford in my studebaker . I just don’t get solving shorts and such . Enjoyed your videos, you are clear and concise. Great job !

[@melpaul7905]

The best video on KZbin .....i have watched lots...complet and clear to the point....just subscribed

[@DuperSuperDave]

Well done again, very thorough explanation of the issue and how the issue was resolved!

[@peterv1036]

As usual Dan, you fix what others can't. Great video.

[@moetina]

If somebody asks me,what is the most interesting film or video that i have ever seen in the cinema or somewhere else,i`ll tell them:DiagnoseDan!!!!! As usual super video Dan,i wish to give u millions thumbs up))Thank you very much and be happy!

[@Diagnosedan]

Ha ha ha 🤣🤣 Thanks that's nice👍👍

[@jamesbalderson7969]

One of the Best video complemation,very informative.

[@MrPropanePete]

These are great instructional videos and I now understand things that were a mystery to me beforehand. Many thanks Dan.

[@KeepingItKeith]

This is such a great video. I was like c'mon man. How do you just end the video like that..... Then I realized it was only half over and knew you were gonna go deeper.

[@lylezink1518]

Dan i sure hope you get to a million subs. Your are exactly what us wanna be mechanics are looking for????

[@shellscripting9526]

Brilliant work. Look forward to see how to take care of the immobilizer on the computer. THANKS !!

[@Diagnosedan]

Thank you!

[@ypautomotriz]

excellent showing . from venezuela much regards colleague!!!!!! muchiiiiisimas gracias.

[@Diagnosedan]

Thank you!

[@jerrynonofbss2588]

Dan, that's not how you handle a MOSFET. It is ESD sensitive. Great video, now I know more to troubleshoot my corolla's problem. Thanks.

[@Bgroup80]

Very very very informative and clearly explained. God Bless you and ur family. Thank you and appreciated...

[@wtfman5313]

That was an extremely informative video! I'm subbed dude! Thanks for probably the best transistor demo I've seen yet.

[@Diagnosedan]

Wrench Spinner thanks for the nice comment buddy it's appreciated!👍

[@BigMac2222]

I've been in a similar situation dealing with an engine control module from a different vehicle and had to trick the anti theft system also. I want to think my way of dealing with it was probably not as quick as whatever you had up your sleeve but it will work on almost any car and I felt very crafty when it worked.

[@Diagnosedan]

Did you taped the key of that other car into the antenna?🤣🤣

[@BigMac2222]

LOL, nobody says a car must have only one control module for the engine.

[@madlinevirgine5389]

you are making it soo beautifully informative with that sense of humor loved it thanks again

[@Diagnosedan]

Your welcome and thanks for watching my video's.👍

[@kennygrant69kg]

Yet another great video! Very informative and well explained. Maybe the 'specialist company' that gave the PCM the all clear initially should have a watch 😜

[@Diagnosedan]

Kenny Grant That company normally does a great job. But something must have gone wrong this time😁

[@8power0]

You remind me of Scanner Danner on the european car line level , how about a 08 335i with ERROR CODE START ASSISTANT INACTIVE all of a sudden with no fare warning . Thanks for the great videos and please keep it up truly appreciated .

[@Diagnosedan]

8power0 Thanks for the comment it's appreciated ! 😁

[@mckoylach1622]

Great informational video,ignition coil driver....thanks for the video even though I couldn’t have fully comprehend it yet....

[@Diagnosedan]

Thanks for watching!😊

[@Autofixpals]

VERY good explanation Dan. I have an E36 not as clean as that one. Please do share your immobilizer trick.

[@Diagnosedan]

Thanks for watching my video's it's appreciated!👍

[@raymondcascella4920]

Great vidio very easy to understand. Most vidios on electronics they asume that you understand tech terms and you have a year of school on electronics.

[@Diagnosedan]

Thanks Raymond!

[@tam1381]

Dan great video and very clearly explained in detail. Dan your still the MAN.

[@Diagnosedan]

Tam Thanks for the nice comment as always!😁

[@MrGazzw]

Great videos I love them and I'm a UK subscriber, I've found car electronics a bit daunting but always managed to fix the cars I've owned. I must say, you seem to work on a lot of the big German brand cars compared to any other, and there suppose to be the best in the world, ????, one would have to question that really coupled with the amount of them I've seen broken down at the side of the road. Not good for car under 10yrs old really. Keep it up and keep teaching us lesser tech minded people.

[@Diagnosedan]

Thanks for Subscribing Garry!

[@colinwilson1585]

Great diagnosis. I think I learn something new on everyone of your videos 😊

[@Diagnosedan]

Colin Wilson That's Great!💪

[@rogersy7209]

Lesson learned here was not 100% rely on information provided customer and other shops for the reliablity of part tested or replaced. The PCM coil driver was confirmed defective by DiagnoseDan. which other PCM shop declared was in good condition. You have to test it yourself to confirm and solve the problem.

[@Diagnosedan]

Thanks for watching Roger👍

[@fionegan1041]

Brilliant as usual Dan, but I don't understand how 11 donkeys put 👎, what's not to like, this stuff is priceless, keep it coming great show

[@Diagnosedan]

You always get a few of those no matter how good the information. But more important is the thumbs up and the great comments i'm getting like yours😀

[@patrickdailo7443]

Good day sir, i am patrick from the philippines i a preciate what your sharing us i have been so eager to understand what is it in the ecm hope to see more of your tutorial thanks... God bless and more power.

[@careyautorepairs]

Loved my old E36. I had a blue one back in the days I got off my brother cheap.

[@forrestkim4828]

Beautiful !!! Out standing diagnosis with knowledge .........

[@vovakurtiak4536]

I really like your approach Dan. Its awesome Regarding the driver - it is 55V 80A P-channel mosfet. The rest 5 cylinders works fine so the MCU micro controller seems to be fine and maybe it would be enough just to replace a shorted Mosfet and a gate driver between micro controller and Mosfet to fix the MCU

[@billrimmer5596]

That must b your line of work. U knew exactly what he was talking about. Thank u for your input!!

[@TheCarTakerGarage]

This was just a fantastic video! No need to say more :) Greetings from Norway,Stefan :)

[@Diagnosedan]

Thank you!

[@TheCarTakerGarage]

@@Diagnosedan thank you right back at you :)

[@paziipa]

Definetely my favourite channel

[@mrgrumpy5116]

very interesting, and a good presentation on mosfet switching, thanks again for a great video

[@schuma61]

Best MOSFET explanation ever!!!

[@timothypattle7003]

Very good explanation once again.Thanks for putting your time , effort & knowldge into this video.im learning a lot from this thank you Dan

[@Diagnosedan]

Thanks for the kind words Timothy

[@erichagler7842]

one of my favorite tools .... got a simple infra red thermometer but would do that same quick test ....

[@Diagnosedan]

👍👍😊

[@agoodneighborautorepair2176]

👋Sir, Super nice explanation and information, you make me feel like be back to the technical college, many blessings.

[@Airman..]

Excellent demonstration dan 👍

[@Diagnosedan]

Airman Thank you!

[@armintokovic99]

one of the best diagnostik videos

[@Diagnosedan]

Thanks!

[@keeper1855]

Best car teacher on YT!

[@train4905]

Dan that was abdolutely fantastic mate.just brilliant.steve from the uk.

[@fisqual]

I've replaced mosfets on FORD ECUs before but never anything German. Glad it works the same.

[@PitTV05]

very detailed and well explained videos. im really learning a lot from you sir. new subscriber here from the philippines. keep it up.

[@EiD248]

YOU are the best. Thanks for the dissemination effort. I see all your video. Great

[@billyyoder8171]

Thank you Dan. Really appreciate your videos. Good job. God bless you. From Texas.

[@Diagnosedan]

Billy Yoder Thank you so much for the great comment!👍