Duramax LLY - FICM / Injector Trouble / Misfire - Part 1

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Come along with Eric O. when he steps out side of his comfort zone in this multi part series and has a look at this 2005 GMC 4500 with the LLY Duramax Diesel that is having some sort of issue with the FICM and the injectors and a code P1229. Time to learn something!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair 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 South Main Auto Repair, 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 South Main Auto Repair.

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15 июн 2016

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Комментарии : 503

@markstuckey6639 5 лет назад

The FICM is not a voltage source but a voltage limited, current source. Because the injectors have to open against a high fuel pressure they are very highly inductive and being direct injection have to open very quickly. So the FICM supplies a current of 22A. At 47:04: the lower limit of the green trace (when the injector is being held) is about 4.7V; this divided by the resistance of the injector gives 22A. Still at 47:04, zoom in on the leading edge of the yellow trace, you will see that it is not instantaneous but has a fast ramp. To drive an inductive device instantaneously would require infinite voltage. When the injectors are turned off the high side of the FICM reverts from a current source to a voltage source, thus preventing excessive ringing. I suspect the idle voltage is set at about 18V to prevent ringing; the change from 5V to 18V should exceed the back EMF of the injector (loaded by the FICM). If you have pin extractors for the connector plugs swap the cyl3 and cyl5 inputs then swap the plugs on the injectors themselves. If the fault goes to cyl5 you can be certain it's the FICM. In case you are wondering a voltage source has very low internal impedance (hence low resistance) and a current source has very high impedance. Ideal zero and infinite respectively. Yes I have worked on Isuzu D.I. engine. Very good engines (except for one or two G.M. forced on them). Though I am glad I don't have to anymore. Really enjoy your channel.

@ranchugoldfish3822 5 лет назад

Your write up is well presented.

@chriskriewall8941 4 года назад

You sound very knowledgeable in these engines are hard to work on not very many people understand how to troubleshoot and diagnose for lack of better words electrical issues I would like to ask you a few questions possibly direct message I am trying to troubleshoot a crank no start situation on my lb7 Duramax and I I have reason to believe it might be a ficm gone bad but not sure second I don't know how to troubleshoot in the sense of real-time if the truck will not start please let me know if I could have a conversation with you I would appreciate that

@chriskriewall8941 4 года назад

It ended up being a loose crank reluctor ring which I am now in the process of putting back together luckily nothing got chewed up or damage it just simply fell off in the bolts in the knocks and went down into the oil pan

@bigfootemobileauto9734 4 года назад

Hey Chris I appreciate you replying to what fixed your problem. So all the bolts came off on the reluctor ring which is right in front of the timing chain? I guess it’s not a complete ring around the crankshaft it’s like a half ring & the bolts came off and fell in the pan right? Sorry for the long question.

@WatchWesWork 6 лет назад

I know this is an old video, but the "double tap" on the injector is a form of precombustion. It's why the Duramax is so quiet.

@sonofthunder. 4 года назад

pilot injection

@63256325N 5 лет назад

I figured what the special tool was as soon as you opened the hood.....a _very_ small mechanic! Great diag.. Moving on to part two. Thanks for the video.

@Charles_Mulberry_7977 4 года назад

In this video I see a mechanic who is a good teacher and more importantly is a great learner!

@stevewaclo167 4 года назад

“Looks like it’s got some fresh tape on it. That’s always a good sign, said no one ever.” 😀😀😀

@HUBBABUBBADOOPYDOOP 8 лет назад

*@**36:18** "Ok, Hanna- start it up, turn the wheel all the way to the LEFT, and listen for a squeal"*

@SouthMainAuto 8 лет назад

Hahaha!

@Adam-bw4lw 8 лет назад

hahah, RIP Erick :))

@RegularComputerLife 8 лет назад

I'm sure troubleshooting videos like this are hard to make , especially with the recording, editing and all the other stuff & effort you need to do to make this a finish product, but they are one of my favorite types of videos and I really enjoy watching them! Keep up the great work Eric! :D

@JP_Stone 4 года назад

Your videos are the best. As a new Auto Tech learning the ropes watching your videos has been a great help for learning symptom based diagnostics and critical thinking.

@jackmasini7692 5 лет назад

Diagnostic skills are incredible. Especially on things you are still learning on.

@sierravortec2629 5 лет назад

I know this video of 2 years old but I recently discovered this channel and I’m now binge watching all the videos from #1, and I want more diesels!

@billymccagh5800 8 лет назад

Hi Eric as you have tried your hardest on the Duramax but I like your style you think things out and you go through your procedure and that's fair I hope you let us know you were right keep up the good work it's a joy watching a master at work others should take your need.

@alanparadise3139 4 года назад

I like this guy's determination to find the right problem with injector's issue and to fix it right. That makes a good mechanic.

@plankton199 8 лет назад

It is pretty impressive how you solve problems in your videos. You have the same critical thinking skills that got the Apollo 13 guys home. I wish any of my local mechanics had your curiosity/determination. Thanks for another great video!

@fredwalker839 2 года назад

You are 100 percent correct !

@aronharris6847 Год назад

Eric I am new to the channel and appreciate your insight. You are a stand up guy and and make a mistake every now and then just like the rest of us. I find it a very rare quality in a person these days who is willing to admit they made a mistake. This is not meant as criticism but a compliment. Thank you for bringing a human aspect to your videos. We all make mistakes and that is ok, but its what we do with them that counts.

@pauldigiorgio6373 2 года назад

I've been a back yard mechanic since I was young I've worked in shops doing timing chains on Hondas Toyota I've done brakes and front end wk also worked on big trucks and had a good time doing it all now at 65 its a lot harder to get things done of course with arthritis and back problems from being bent over vehicles all day I get to enjoy watching a master at work love your video's and how you diagnose things great job 👍

@connorbunch3577 4 года назад

You continue to have a pleasant demeanor even in such a frustrating situation. That's something I need to work on.

@williegillie5712 Год назад

Ha ha yeah I remember some of those days. Broke a few tools, didn’t want to take it out on the car

@erikjohnson2889 4 года назад

Eric, it takes a special dude to post a video in which you're working on a vehicle that's not squarely in your wheelhouse. Funny enough, you're still killing it and teaching us great stuff. This is one of the last remaining SMA videos I haven't seen, and I'm deep into reruns already hahaha You da man

@vipervette03 8 лет назад

Eric, this is my favorite SMA videos, were you analyse a problem other shops are not or can't fix. Take care!!

@SouthMainAuto 8 лет назад

Thanks :)

@reecejaxen8112 2 года назад

I know im asking randomly but does someone know a method to get back into an instagram account?? I somehow forgot my account password. I would appreciate any tips you can give me!

@shepardhudson4528 2 года назад

@Reece Jaxen instablaster :)

@reecejaxen8112 2 года назад

@Shepard Hudson Thanks for your reply. I found the site through google and I'm waiting for the hacking stuff atm. Takes a while so I will reply here later with my results.

@reecejaxen8112 2 года назад

@Shepard Hudson it worked and I actually got access to my account again. I am so happy! Thanks so much, you saved my account :D

@christiandiaz7422 2 года назад

I have looked through the WHOLE RU-vid and found a wave form that finally proves that's Diesel and gad direct injection have almost the same concept. I wish that you put more videos like this Eric. There's a lot of diesel heads that will love more of this info

@fredwalker839 2 года назад

Eric, I really respect you for your honesty ! The ability to think out load reminds me soooo much like me ! My partner thinks I am nuts ! I talk to myself when I like you venture into ; How to say , I don’t work on this stuff enough & I need to hear my own voice ( my helper ) venture into stuff I can fix , but need undisturbed time to do so ? Your will to fix every challenge that comes in ! I won’t say no, until I look, with my own voice to get to the bottom. You are right, the control module is “pooched” .. Have a great day !

@vincentlallo6543 2 года назад

to put all this effort to diagnose this problem on a job you really didn't want makes this job even harder . i hope the guy who owns this truck watches this video and sees how hard you worked. i wish i had the intelligence to deal with electronics. amazing work ethic!

@brianshaffer5090 2 года назад

Though I don't have all this equipment to test the way you have, this video has given me a huge amount of insight on what's going on in the system. Very helpful.

@hddm3 5 лет назад

Since you used to work on semis I always go to the alternator on those for my power and grounds. Especially on the pass side

@jakeandrus690 8 лет назад

Great diagnosis Dr. O. Looking forward to the next installment

@demderby79 8 лет назад

Good job Eric. Good for you for taking on something new to you. Cant wait to see the fix.

@toyotatechMDT 8 лет назад

From my diesel experience (Toyota Denso) The injectors are ground and power side switched and operated at high voltage to open quickly under the massive fuel pressure (up to 2000BAR) there are two transistors for each injector and the collapse of the magnetic field you'd expect to see is 'collected' by the module and stored for the next injection event. There is a high voltage generating circuit inside the module where it creates the high voltage and also stores it. The injectors need the high voltage to operate quickly enough (5-8 injections per compression stroke on newer stuff) The amperage is high on them! It's not dissimilar to the old peak and hold gas injection. We see a lot of diesels in cars in Europe so see more problems than you will I expect. (I'm told diesels on cars are not that common in USA?) You seemed to find your way through it though, nice video.

@toyotatechMDT 8 лет назад

1:09:00 your correct with the module controlling current flow.

@thisismyuniquestory 2 года назад

Brilliant is my take on your work Eric. I've just had the advantage of watching part 2 as a follow through to completion. I've completed 50+ years trouble shooting on combustion equipment, boilers, air heaters, starting on American Powrmatic air heaters in 1968 and working for Powrmatic UK on R&D and then on the road for five years as a service engineer. Sites like the maintenance squadron for the RAF Red Arrows, the Concorde hanger at RAF Fairford, 002 and 03 before they received the airworthiness certification. Heating and ventilation maintenance at the top end working for the best of manufactures opens do many doors. Process equipment with bakery ovens, ceramic tile manufacturing, and more making a great life experience. So many sites with long term faults for years and there was no one to locate the fault or faults after 10 or 20 years. For those sites there will be no RU-vid videos up until 2012 when I retired. Rethinking that statement, even then I should have recorded my stuff because delivering my problems or solutions could have speeded up the process in two directions for me and others. Putting my money on the line to underwrite a repair, to prove that my diagnosis was for the correct part. I had to be 100% correct or I would never have got paid. Thinking back to working on steam boilers with the inherent many danger's of steam for me and others around the area. Knowledge never taught in any classrooms but by men, always men and so many had learned their craft as servicemen serving in WW2 fighting for King and Country. Plus others who worked for shipyards, railway engine works, aircraft production often working under fire with bombing raids in progress and the imminent danger of being bombed every working day. I was privileged.

@outbackcountry512 5 лет назад

I drove this style truck for years , drove several with Duramax , every one if them had injector issues , kept our mechanics busy , nightmare to work on , was so glad when I started driving a Volvo Tandem with 18 Speed , even checking fluids on these things was tricky at times , doesn't surprise me to see it with only 54,000 miles about 85-87,000 kms here in Canada , We never had a Duramax go any longer than 100,000 kms without having injector issues . That bucket would come in handy for building deer blinds tho 👍👍

@billyrayvalentine5220 2 года назад

High voltage, you dodged a bullet and checked that box. Nice detective work on breaking down the individuals and comparatives. Excited to see what happens with next FICM. 👍🏻👍🏻👍🏻

@TheWwong 8 лет назад

High dollar steering wheel cover at 3:20........lol. Exotic black snake skin leather?

@kenman1717 8 лет назад

Out of your comfort zone? your a miracle worker with everything you touch.

@jdean399 8 лет назад

Very interesting Eric, thanks for filming it, I would of been confused seeing the signal on the bad injector, not realising that it was back feeding through the system, obvious now !

@sparky_oo1955 2 года назад

Love your thought process and thorough troubleshooting abilities

@autbru 7 лет назад

Here's a quick tip I use quite often: you can load test your circuit using a sealed beam: disconnect both ends of the circuit to be tested; hook up your power probe to one end and a sealed beam (an H6054 will work just fine) to the other end. Ground the sealed beam to your power probe and send her some juice. If the sealed beam comes on, you're sure your circuit is good! Reason I use this: I already came across bad wiring, not totally open but I would still get a good reading on the multimeter. So this is the way I found to make sure a circuit is ok. This said, I'm a canadian heavy duty diesel tech and I think you're doing great for someone not working on those very often! I love your other vids as well!

@themikeanic1535 4 года назад

autbru ...... he has been using that method with high amperage bulbs for many years, it’s not really a small secret like it was 20 years ago.

@ponyhorse127 8 лет назад

Great video Eric!!!!...those big diesel trucks are awesome!!!! hahahaa.....I can not wait to see part two!!!!...we all are learning too much from this video...thanks for bring us along with you!!!!.....swaping another FI Module for test will solve all the questions!!!...greetings to all at SMA!!!!... :) :) :) :)

@nicknicu1787 8 лет назад

GM electronics...I swear they make'em to keep technicians in business! Great video! Thanks.

@SouthMainAuto 8 лет назад

Thank Goodness!

@nicknicu1787 8 лет назад

+South Main Auto Repair BTW,I love your new LoadPro! LMAO!

@SouthMainAuto 8 лет назад

;) Load pro old school version

@HappyHands. 4 года назад

As a Dodge owner i can tell you,,,, GM electronics aren't that bad ;)

@aterack833 3 года назад

GM and ford have very good engineers but with very different goals, ford wants to innovate, even if only temporarily, While GM wants to make things easy to repair/work on and assemble, it’s not something that carried well for either company into their Diesel engines ...

@heathroi 8 лет назад

other shop (popps hood) "SMA?" " yep. tell em our tool was stolen."

@livingmaga6299 7 лет назад

I normally load test my circuits to give me 100% on diagnostics Eric. Don't get me wrong your a great tech. and enjoy your vlogs.

@zoidberg444 8 лет назад

Thanks for bringing us along on a diesel diagnosis Eric. I don't know a massive amount about diesels. I've helped drop and reinstall an N47 diesel out of a BMW and replaced the turbo/exhaust manifold on a Golf 2.0 TDI but I'm a bit in the dark about them compared to petrols. One thing i do know is that most of the modern euro trash diesels are using piezoelectric injectors these days. The crystals probably behave differently to a coil. Although GM might still be using the older style as GM stuff always seems a little behind what Euro manufacturers are doing. Most people under 40 without a heart condition wouldn't suffer permanent damage from a 40V shock but you can never be to careful i guess.

@stevescott8758 8 лет назад

Eric, I feel for you wading through this problem, can tell you're well outside your comfort zone. Good on you for not just backing it out the door. We see more diesels than petrol vehicles here in the UK - the smoke does fry your brain. Looking forward to the day when they ban diesels here and we can concentrate on high pressure petrol / hybrid and hydrogen powerplants. Keep up the great videos Cheers Doc...

@meviewer2 7 лет назад

small advice about these vehicles, many times I seen rough idle, circuit codes be caused by wiring harness rubbing against the aftercooler pipe or to the hood.

@billysmith6131 4 года назад

Wow, stumbled across this old post......ok...I'm gonna watch it!!

@kevinwoodcock7578 8 лет назад

You sir are a mechanical pit bull.. Neva give up.

@leo28a 8 лет назад

Great diagnosis Eric From the minute 36 I immediately concluded that the driver "FICM" is bad and got some moisture inside of it from sitting for so long I guess. But anyhow Eric, indeed great new horizon challenge vid. And I wish that ivin was joined in this vid. Can't wait for part II :) thanks.

@johnmcdonough955 7 лет назад

"I think the engine is under here somewheres."

@SteveRobReviews 8 лет назад

Nice one Eric, I would have turned that into a winter project. Man I have to go back to square one. LOL

@bobmoy3406 8 лет назад

was hoping that you would raise the bucket and take a video of your shop from above....hahaha Can't wait for Part 2.

@SouthMainAuto 8 лет назад

The thought crossed my mind...

@CS-wk5jm 8 лет назад

yay, back to the good ol welcome back to the sma channel!! :) thanks!

@Tedybear315 8 лет назад

I get the idea that "Special Tool" was a tiny set of hands and arms to work around that engine bay.

@TheRick2130 8 лет назад

nope, is not econoline :)

@hawaiianf1504 7 лет назад

So you mean special tools like having Trump hands? O,.,o

@xinfeng1686 7 лет назад

As a common rail fuel system, it is extremely dangerous when you try to ground or switch the injector control wiring. Basically you might dump lots of fuel into that cylinder when other injectors are firing, since 4 injectors are sharing same high side bank from FICM.

@wyattoneable 8 лет назад

LLY and 2005? cool, I'm listening. "load pro" ha ha I got that. I love hanging around during the "thinking" process. I wish I could help. Thank you for the description at the end, I wrote that down for future reference. PS I saw Steve's teaser video. So cool you guys could meet up.

@2015_Rubicnn 3 года назад

GM Fuel Injection Control Module (FICM)(LLY). Before replacing a FICM for an injector related fault code check and make sure there is not a injector or injector related circut fault.The FICM (Fuel Injection Control Module) controls the electrical impulses that control the fuel injectors. The fuel injector ignition voltage circuit is Pulse Width Modulated (PWM) , between 20 volts at idle to approximately 93 volts in order to compensate for increased engine load and RPM. The fuel injector control module energizes each fuel injector by grounding the command circuit between the fuel injector control module and the fuel injector. The fuel injector control module monitors the status of the ignition voltage circuits and the fuel injector command circuits.

@vacuumfreak95 8 лет назад

As someone entering into the automotive world, this makes my brain hurt. And I've been in college for a year and a half! I'm easily discouraged about my career choice, but cars and how they work has always been my passion. I just have to keep reminding myself that!

@name_less7687 2 года назад

This man was seriously over complicating this. So I don't blame your brain for hurting. First thing I would've done right off the fucking rip is fix those shit splices that were done by who knows who then throw some heat shrink on them and leave them looking proper. Check to see if the harness for the cylinder looks good and has solid wire connections. I will tell you now that when someone else has done work on a vehicle in the area of the problem or on the problem prior to you.. 9/10× they were the cause of the problem and you're going to feel pretty stupid wasting time doing all this dumb shit before ruling out the basics on those 9 jobs that will end up being the splices of someone else's work or something of equal comparison.. after you do all that and waste the customers money.... yup you'll feel stupid. Fix the wires, confirm the harness looks good and isn't corroded or loose.. Next test for power from ecm to pcm with, yes a multimeter, and then test from power from pcm to ficm, and then to the injector. Address problems along the way accordingly. On this job you would've gotten all the way to the end of the process before you found it but if you'd fixed the connection then you could simply go in the back of the injector harness and trust that the wire's properly intact. This whole process should've take 30 min. Maybe 40. Lmao Idc about injector 5. Knowing injector 5's a control and working properly.. the only reason to look at injector 5 with anything is if you think your meters broken. Why the fuck look at it on voltage charts? Smh why the fuck waste time and test the new ficm? If the fucking missfire drops.. it's the fucking ficm. This man's truly dumb. Man .. watch part 2 and you can note down how to do nothing like this man. Pretty much in the reverse order and no need for the fancy tools lol.. trying to learn from others that struggle makes you struggle. Truth is most machanics suck.. they're lost and they make almost as many problems as they fix.. if not more.. this would be a 30-40 min or less diagnostic test to anyone with common sense.. you just rule out the dumb and then test from the main power to the troubled paths end. Simple as that. Probably would take longer to get the wire diagram printed than to test and find the problem. Just think objectively and rationally.

@leosthrivwithautism 3 года назад

Jamming out to the crazy intro music. Love the drums. But also here for the main man Eric. Always enjoy your videos. 👍

@lolzordje123 8 лет назад

Eric, be extremely careful unplugging injectors like that. If you are working on a piezo type injector, both the opening and closing is controlled by the computer. The closing isnt being done by a spring or something. this means that a injector can stay opened when you unplug 'em. this can burn a hole right through the piston.

@slaznum1 5 лет назад

Thomas Fooij You mean with the engine running? I was wondering about that as well

@bmwslangen 8 лет назад

Very interesting EricO, really enjoyed it! This setup reminds me of the two type of injectors we have in the "gasoline world". For long time (even long before GDI) your injector drivers were either of "saturated switch" type or "peak & hold" type. It's simply a matter of deciding where the current limiter is placed. Either you use the injector as a current limiter (saturated switch) or you keep control of the current yourself (peak&hold). Saturated switch type is voltage controlled and the injector has a resistance of 12 ohm or higher. This is the most common. Here we don't have to control the current flow, the injector driver simply applies typically battery voltage when the injector should open and keep it there as long as needed. Peak and hold type is current controlled and the injector has a resistance of less than 12 ohm. Here someone NEEDS to control the current, otherwise we burn up the injector (so never supply +12 for longer period of time to these low-resistance injectors). As you mentioned in the video, it allows a big current flow in the beginning since it requires a lot of current to move the pintle. Once the pintle is opened, very little current is needed. To keep the pintle open, you can either reduce the voltage or turn on/off yor current very very fast. The advantages of peak and hold is of course much faster open/close response and a bit more precise fuel delivery. The disadvantages is of course a much more complex/expensive control system. So you probably encountered some kind of "highly developed" peak&hold injector circuitry :-)

@johnwelch461 4 года назад

From oz down under,you really know your stuff 👍👍👍👌👌

@BullittOutdoors 8 лет назад

The "Double Tap" injector pulse is called Pilot Injection. Makes the diesel engine quieter at idle. As for FICMs, the Ford 6.0 injectors run on 48 volts.

@greatreset3 5 лет назад

The special tool the other guy was missing was A BRAIN!

@chrisbentleywalkingandrambling 2 года назад

This would be so easy to fix then just run it through a second time and 'discover it'. I'm glad you don't do that and you give it us warts and all along with your thought process. Great video.

@joshuaodowd9107 8 лет назад

Love the vids Eric thank you for taking the time to make these for us. I was wondering where you get those toptul tools?

@mikechiodetti6737 5 лет назад

EXCELLENT VIDEO! I'm waiting for part 2, but it appears the FICM is bad!

@lioneljm2 2 года назад

For a second there I thought you totally missed infinity and beyond, but you recovered 👍

@kylejones4465 2 года назад

So glad I found this video it help alot I have a dead druamax that was working wonderfully and power to both sides of the injector causing it to bypass thanks great info.

@butchtheiw 4 года назад

As soon as I see this guys face, I know I'm going to not only like the video, but I'm gonna learn to fix the very problem I'm having at the time. Like a buddy telling me about something he knows, in case I ever need to know it.

@MrOlderandwiser 7 лет назад

The two "spikes" are because this engine has what's call pilot injection. It divides the injector pulse to reduce the amount of fuel so it makes the engine runs quieter. The Cummins engines us this now.

@johnfountain8143 8 лет назад

Good video .. we have lots of common rail diesel over here in the uk you soon get use to the Idiosyncrasies bit of fuel pressure control but not much different to a petrol (GAS) system..... and love the new tool "LoadProbe" HaHa Regards John

@stevenfuchs2548 4 года назад

Holy Seagull poop! That was amazing. And I'm not so sure we can do it, unless we have the right equipment and your diagnostic coconut! Fabulouis video, just fabulouis. I bow to the Master.....

@justinp8946 8 лет назад

Just click on the "fix it" on the scanner. Lol

@SouthMainAuto 8 лет назад

I tried that... nothing happened..

@MikesSoftLemonade 4 года назад

@@SouthMainAuto Yeah they want a bazillion dollars and you must have the current software update installed. No Thank$

@jeffbohn2576 4 года назад

That just bugged the heck out of me..I mean it popped up like 3 times..

@superdave3438 3 года назад

Love your thinking process!!!

@thedreadedgman 8 лет назад

Can't wait to see if FICM is faulty or something weirder! The 2x injection pulses are called a "Pilot" and "Main" injection and it has to do with efficiency and "diesel rattle" noise reduction. At lower engine speeds

@SouthMainAuto 8 лет назад

I should have reved it up to see how that changes. Hind sight is always 20/20.

@Poochie43124312 7 лет назад

thanks ERIC its a learning experience for all of us. I hate working on diesels. So I don't.

@garysgarage3669 8 лет назад

Great video, you're by far the best mechanic on youtube.

@SouthMainAuto 8 лет назад

I wouldn't go that far.

@badgerpa9 4 года назад

@@SouthMainAuto But he did.

@Internetpirate3 8 лет назад

I think the duramax uses piezoelectric injectors which means they don't have an internal coil but instead have a stack of quartz crystals which expand when current is applied to them and that's what opens the pintle in the injector. That's why the resistance is so low and it takes such high voltage and current to actuate them. All the newer common rail diesels and direct injected gas engines use this same type of system.

@tecnaman9097 8 лет назад

Don't think the LLY had the Bosch piezo injectors, they came later down the track...could be wrong!

@Internetpirate3 8 лет назад

They may not have the piezos for all I know, never worked on a lly duramax but definitely the newer diesels have them. Would be interesting to see the current/ voltage ramp on those style injectors tho!

@zoidberg444 8 лет назад

I was thinking that. I don't know a massive amount about diesels but I'm sure all the newer stuff is piezoelectric. Then again with GM You never know because the technology in their vehicles always seems a little old.

@wazza33racer 5 лет назад

Piezo types on the new engines can fire at much higher rpm than the old type. It was one of the ways the diesels at LeMans could beat the gas powered cars.

@lexmaximaguy8788 8 лет назад

sexy truck. Asides that duramax diesels are generally not to painfull to work on.

@feeneysmechanical6215 8 лет назад

on my modis I enter it under workhorse. I have done glow plugs on them for the city of buffalo.

@trangia12 2 года назад

If you use your Power Probe you would be assured of a good ground. Love the Power Probe.

@TonyLasagna Год назад

Oh man. Mitchell. What a nightmare hahah. Almost lost my truck to that beast of a software company (I write code for software/websites myself). What a nightmare. She is still alive to this day.

@motorcyclesandridingfree2899 8 лет назад

Sometimes you have to start with what you know works to find whats broke with unfamiliar systems. Its been awhile since ive had to really dig into a duramax except for glowplugs

@TheDisgruntledMechanic 8 лет назад

Nice job of finding the ghost voltage with the loadpro! A valuable tool for sure! you forgot to push the "MB" though so not sure how you got it to work. haha!

@SouthMainAuto 8 лет назад

Haha ya just had to go there lol

@slaznum1 5 лет назад

Speaking of rock ‘n’ roll, the great band Blue Öyster Cult is from New York state. I’ve loved their music since I was a kid

@theoldwizard998 8 лет назад

Pretty much all "common rail" injection system now do multiple injections per cylinder event. Helps a lot with reducing the diesel "clatter" and emissions.

@tam1381 8 лет назад

Good job Eric, i thought at one point i could see your brain letting the smoke out....

@thegallolife 8 лет назад

The tool you spoke about the dealership didn't have is called the Active Fuel Injector Tester (AFIT). It can balance test the injectors.

@SouthMainAuto 8 лет назад

Well we proved ya don't need that haha

@rickjljr11 8 лет назад

One other long shot. Did you check for a short to chassis? Trying to figure out how the FCIM generates that current waveform it is possible that it has an isolated power supply. A ground fault would not show up the way it does where everything is eventually referenced to chassis.

@PineHollowAutoDiagnostics 8 лет назад

Wow Eric great case study and fantastic scope analysis! Definitely more complex than your traditional constant-feed, ground-side switched low-pressure gasoline injector setup. Still, the injector is a coil of wire with two terminals, only the control system is fancier...too fancy for our buddy the test light (or the LoadPro :P) to give any definitive direction. In cases like these, the scope is your best friend indeed. The Verus has 4 channels...why not use all of them? A base line on a known-good component is crucial to pinpointing the bad one. Here the essential data would be the two voltage traces (backprobe "feed" and "control") plus a third channel with the amp clamp. Then you will instantly get a very good picture of how the damn thing is being controlled without having to sift through wiring diagrams, troubleshooters, and vague information. Then transfer the three channels to the suspect bad injector and see what is different. Here like you showed we see lack of current flow due to the FICM not grounding the "control wire"; both voltage traces would be identical...no current flow no voltage drop! Finally repeat the same measurements at the FICM to verify wiring integrity. Dang I wish I would have come down for that one! Looking forward to part 2!

@jorgeoros8589 7 лет назад

Pine Hollow Auto Diagnostics good

@jsj297 6 лет назад

Pine Hollow Auto Diagnostics shut up. NGAS

@tctwg1 5 лет назад

Pine Hollow Auto Diagnostics 🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕

@GuenettesatDay 3 года назад

Maybe he needed a program on his scanner so he could run a cylinder cut out test but idk what hes talking about. You can unplug each injector to test the injectors while its running. He just couldnt figure it out so lets see how you finish this job im excited to see you tackle it!

@garryjohnbetts8227 4 года назад

Hi Eric, firstly love watching your videos. I am curious. What was the Bad Memory back in your Dad's workshop with Diesels???

@MegaGeorge1948 8 лет назад

That high voltage may be from inductive kick from induction of the internal injector coil by the injector controller cutting power to the injector in the engine firing cycle.

@brucecolonna2142 8 лет назад

I believe the ficm provides up to 65 volts to open injector, the 12 volts is like a bias voltage for circuit monitoring

@denniswilkinson1118 8 лет назад

Great video and way over my head, but very interesting.

@cccdetective787 8 лет назад

Hi Eric I followed the logic of your diagnostics and am expecting you are correct. I was wondering why you did not check against a known good signal on the other bank not fed by the common supply? I would have liked a comparrison with an system with all 4 signals present. You have me waiting for the fix.

@phprofYT 5 лет назад

It makes some sense. The injector is under a lot of pressure so it would require a large amount of energy to overcome the injector and do it fast. Once open it can be held with a small amount of power.

@normansmith7806 8 лет назад

Good video Eric out of my zone to !

@garlinwillingham7011 8 лет назад

Whew! You've cheated death again. LOL Hey, I think you made a good call considering you don't work on diesels.I thought I was the only one that stumbled around trying to figure out what to do next. Good video and thanks for sharing.

@ianlevine273 8 лет назад

One thing I'd add to your conclusion is that the #3 control voltage is probably slightly higher because the circuit in the FICM that isn't working isn't loading it down the 0.2v that the working ones are loaded down by.

@NCPDFSB 8 лет назад

eric glad you explained the theory at the end and you had the filter on the scope, i saw the parade of voltage and was asking myself how can the system not overheat? p.s. its those pesky amps that hurt!

@franknewling1139 5 лет назад

@ about 26:00, I'm saying, look at the other side of the screen! It's showing 12 V and 50 V command operation on the individual injector picture?

@jeffryblackmon4846 4 года назад

Congrats. Look at your experience this way: you learned how that particular diesel engine FI works. Store the knowledge for future reference. Or something.

@tim1299 5 лет назад

by looking at the good bank (drivers side) , could you have seen, comparing numbers from two to four , a relationship that was correct to the problem on the passenger side and taken the correct action?