I had heard recommendations to look into Scanner Danner but put it off. Found this video and thought "Wow, THIS is the level of content that I had thought vanished from KZfaq." Then I saw that this WAS Scanner Danner. You got yourself a sub!!!

Here is the short version. I was six months old when my father died, had an abusive step father from age 6 to 15. Hated everyone and everything, used drugs to find a happy place, took 15 more years to kick it, found a new "high" and that is through my Lord and Savior, Jesus Christ. Somewhere in the middle of all of this I found my love for electricity and electronics. I can do all things through Christ who strengthens me. Philippians 4:13 I am nothing on my own.

Anytime I watch a video of yours I shake my head....You are just too good! I learn something the second a Scanner Danner video starts playing. God Bless you Sir!

I am very impressed. I watch these videos over and over. Great job in sharing your experience and making it easy to understand. I will be subscribing to the Premium. I have had trouble with these waveforms for years. These videos are excellent trouble shooting guides for me. Thanks again Sir.

First I would like to point out that there are teachers and then there are teachers. You are a teacher in the truest sense. Someone can know everything there is about a topic but not be able to convey it in such a way that you get it and want more of it. That is a true gift. Though I did drivability work at the dealership in the early GM computer days it was not with this kind of understanding. My primary specialty has always been automatic transmissions and few have looked at waveforms for diagnosis. I briefly touched on it about 15 years ago in a simple on/off solenoid (as opposed to a PWM controlled). It does occur to me that though on time is measured in millivolts, in reality it appears that it is less than that due to the pintle opening once it reaches sufficient magnetism to actually move the pintle. However, I see the closing on the voltage scale (something I did not know about at that previous time in my life) and it seems like the "On time" and the area where the pintle is open are very similar, though slightly shifted start to finish. Obviously strictly an engineering issue, similar to whatever motivated the designers to use a particular type of injector but a matter of curiosity just the same.

Excellent series. Using what I learned I found the defective wire in the harness between the injector and the ECM. By cutting the pulsing orange lead to injector #3 at the ECM and at the injector and splicing in a new segment of wire, I bypassed the break that was somewhere in the harness.

Here I am over 6 years later, not sure how I missed this one but it still gave me my SD fix today. Thanks Paul.

You are a tRue Blessing to all us blooming Technicians who Love tHE Lord Jesus tHe Christ and look forward to the "Great Garage in the sky." Thank you sir for so freely given what knowledge and wisdom you have been given. God Bless everything you set your hands to do.

It's amazing how life is. I finally figured it out after 50 years I think, That were all here to help each other not help thyself, If your where you are suppose to be and doing what your suppose to be doing, the rest will FALL into place. And life will be a blessing in many many ways. I came here because i was stumped about an injector current waveform that i had never seen before and low and behold look what your talking about. Peak and hold and that's just exactly what my waveform looks like.

I have paid good money for presentations that were grossly inferior to what you are putting up on KZfaq free of charge. But don't go getting any clever ideas :) To anyone reading I bought Paul's diagnostics E-Book, best buy I made in 2011, brilliant! I have said to Paul by e-mail, I hope his students appreciate just what an awesome teacher they have.

Great Video. I am playing with this on my Hantek Scope now to see what it looks like. I have also noticed that sometimes unplugging the alternator will get rid of some of the noise so I can see the pintle movement a little better. I want to do a video on testing injectors with Noid Lights/Test Light, Power Probe 4, and a scope and what you can tell from each and under what circumstances you want to use each. I'm playing and learning. Nothing better that seeing a bunch of good ones to make a bad one stand out when you see it.

Hi, i have recently discovered your channel, i am amazed and speechless . You are a very very good teacher and a good man. Thanks to you i undestand my car in more detail. Now i am not afraid anyomore if i will have a problem with my car. Thank you 1000 times! If you were near me i have shake your hands and buy you a dozen of beer !

I recently purchased a Pico 4425. I was just gathering injector wave forms on my 2007 Jeep GC WK with the 5.7L Hemi, and my 2011 Mustang GT 5.0. I got two different voltage patterns. I had seen the Jeep pattern previously but not the Mustang. I went looking for a reference and found this video. I printed out the wave forms and added the notes from this video. This was a huge help. Thanks. I also have been following your videos and I subscribe to your SD Premium. I was not aware of your personal story. Congratulations on finding your way. Wishing you continued success.

This video is so knowledge packed that it gave me a headache trying to catch every bit of info spread through out, Thank you very much SD.

I could listen to him talk about injectors all fricken day long....... awesome!!!! I wish I went to this college.

First of all: another great video ! You can also find a different design of peak n hold. Aplying full 12V for about 1-2ms and then changing control voltage to PWM mode to maintain injector open and limit current dynamically. Commonly used with low ohm gasoline and LPG injectors. Zener diode you said about is actually a transil or TVS diode.

Another great video. Your book is great and with the videos to help explain makes it just awesome. You are the best instructor I have ever had the pleasure of learning from. Thank you very much!!

HI Paul, you are a Beacon of Hope and a Great Mentor.

I 'd have to say, Paul, some day these presentations will be gone, I will be gone...internal combustion engines will be no more. I don't fear, I will continue to enjoy what you put out. I have also seen inferior presentations that cost much more than this. You have a gift or talent for communicating; you must be thinking sleeping and eating cars, cars - twenty four seven. Good job, buddy.

Great video! You explain things very well and make it seam simple. Well done!

Thank you Benjamin. I wasn't sure how well the above comment would be received, but I am not ashamed of my faith. Romans1:16

thank you. Big fan and Ive used all the skills that ive learned from your teachings in the videos.

Nice! And I agree. This whole "self esteem" crap that we teach our children these days is a complete 180 from the truth! We are to esteem others MORE THAN OURSELVES.

So my friend I know you are where you are suppose to be and doing what you are suppose to be doing and i don't doubt it one bit that since you have started this your life has been blessed in many many ways. You have made my life a lot easier and i'm sure many others alike. You've got a friend for eternity. God bless you and your family. I don't want to sound like a religious nut cause i don't even go to a church, I just know there is a God who saved us all with his son and he has blessed you.

Thank you Danner for these 2 diff type of injector design's. Exellent explanation, I know if I need a refresher i can look up some of your videos. Will definitely register for Premium.

@MyCooley123 Thank you for you comment! I think it means more coming from someone else. Thanks

He has my friend and thank you. Also I would feel just as blessed if I had nothing. Look at the apostle Paul. He was imprisoned, beaten, bound in chains and ultimately martyred and was full of joy and peace! We are NOT promised prosperity when we follow Jesus like all of these modern day "preachers" say. We are promised joy in ALL circumstances!

You can perform this test on any port fuel injected system that uses a saturated switch injector (which most do). I am not sure if you would want to use this timer tool on a peak and hold injector. Fortunately I cannot remember when the last time I saw a peak and hold injector on a PFI system. As for using the current clamp on anything with less than one amp you will get some noise in the picture. You can try filtering it and also moving it away from any ignition components

awesome video very informative

Another great video. And your premium channel is awesome. Thanks Paul!

Nice teaching ty sir idol.

well explained

An excellent paul danner lesson 🍺🍺🇲🇦🇲🇦

Excellent presentation!

❤❤❤❤❤❤❤ knowledge and power

As always, thank you.

Very good thank you. Have a good year

Thanks Carlos

Brilliant video as always

thank you very much!

In my design days at IBM we had several ways to reduce the pick time of an electromagnet. We used them on clutches, print hammer actuators etc. The simplest was to use a capacitor in series with the magnet coil and a resistor in parallel to the capacitor. When the switch closes, the current is only limited by the capacitor with is near zero resistance initially. When the capacitor gets charged the current flows only through the resistor which provides the hold current. When the switch opens, the capacitor is discharged by the parallel resistor. We also used flyback diodes, usually in parallel with the coil to quickly collapse the magnetic field. It would be interesting to see what is inside the PCM for pick and hold systems.

I can explain why the Honda injector has the series resistor and opens faster. Inductors (coils) resist changes in current. The larger the inductor--the longer it will take for the injector to saturate (coil to reach maximum magnetic field and open). Placing the resistor at the coil limits the maximum current cheaply. The low inductance allows the injector to open quicker. In a Peak and Hold, the inductance is also low and therefore opens faster. (continued)

AMEN MASTER....you are amazing... DIOS TE CUIDA TE AYUDA A AYUDAR A LOS DEMAS SIGUE ADELATE MAESTRO.. YO SOY TU FIEL SEGUIDOR,

I have 98 Subaru Forester it runs great for about 2 miles then start missing off and on until i stop and it cools off. There no codes. I have change the coil ,plug wires, spark plugs and computer. Does this sound like an injector. I do not have much test equipment and being that it has be hot. This makes it hard to trouble shoot. Really enjoy your videos they are well done! Thanks Jim

am here again for the 💯 time...

Comment to fivefortyeye-To back up what Danner is saying,when he hooks up the scope he is showing you the waveform,but when he is showing the waveform,he is also talking about voltage,amp etc.lets take the waveform coming from a fuel pump,although you dont have a scope ,you can measure amp.and voltage with your meter and follow along his testing,buy the book and follow him through step by step,try it let him know how you make out.

@ChrisWilson5006 Thanks Chris, that was cool of you to post that here. I owe you one. Paul

@fivefortyeye540i Absolutely not. Of course there is heavy scope usage, but I offer an alternative DVOM test whenever possible. If you watch some of my videos you will see the limitations of a DVOM but I still show it. There is also scan data diagnostics too, so the scope is only part of it. I am sure some of the book owners would back me up on this. Maybe they could comment here?

SCANNERDANNER, can you post a youtube video showing on the oscilloscope what good and bad "spark plug" oscilloscope waveforms look like? How would you know if you spark plugs are good or bad by only looking at the injector waveforms or ignition coil waveforms on the oscilloscope? I have seen you videos of you showing the ignition coils waveforms and injector waveform but never the spark plug waveform any reasons why?

(continued) With the Peak and Hold, the current is allowed to spike higher initially for a short duration causing the coil to saturate faster and then quickly limited to a lower value. This current control is done at the computer. Looking at the total ohms is somewhat misleading as this is a coil (solenoid, inductor). When comparing injectors, it is better to think of total impedance (inductive reactance + resistance). You can also measure the inductance value.

@GolfVariantCL Thank you and Eric (a fellow Rosedale Tech graduate)

Very similar to your friend Roman. Except his father was behind bars for "Thou shalt not kill" thing. And he hit his step father back with lead pipes.

make me really understand.. osioloscop very important for mechanic 👍

Oh yeah I do have the trigger in the middle of the current ramp. Also what would cause a drop out followed by a drop in in a current ramp waveform?

My peak and hold was on a 94 Acura Legend 3.2. I should send you the capture it looks pretty wild, to me anyway. When i rev up the motor the amp line goes wavy but never over 6 amps. I'm going to try and put it on IATN. I don't know how much of it i can put on there.

I would assume that it's either losing a power or ground for the drop out and drop in, but what's weird is the amperage waveform does not drop out. Ok thanks. Found where I can edit. My original question was that why was my amperage waveform dropping out and in when I had the trigger right on the middle of the waveform, but I think what happen was I adjusted either my time base or voltage ,and the scope automatically changes the trigger from normal to auto or single, and that was causing the waveform to look like it was dropping out and in. Next day I tried it again and made sure I still had a normal trigger. So now I'm a little confused on why I'm getting only about 1 Amp on the feed wire for all the fuel injectors. At first I was thinking " ok this circuit is a parallel circuit, and should be getting around 4 or 5 amps being that it's a 5 cylinder, but then I said " this is a sequential fuel system so each fuel injector is a series circuit, and spray in sequential order, and that's why I'm only reading about 1 Amp on the feed wire to all injectors. So just wanted to ask if I'm correct on thinking that the fuel injection circuits are each a series circuit ?

All your videos deserve more views ! They are great ! I found out about you in EricTheCarGuy's FATR btw :D

the fuel injection timing change even a litle like the ignition timing?, or the pcm fire the injectors at the same angle all the time no matter the engine load and speed?

Thanks a lot for very interested video! 1) Could you explain what you mean "...pintle honk should occur 60% of ramp.." @ 29min 43sec ? 2) How to calculate real time of phisically opened injector by using pulse width only ? Thank in advance!

Hi Paul , do you have any videos on the gdi injector operation and testing? thanks, Great videos , keep up the great work

thank you, it's very hulpfull. if you want explaine the waveforme the injector diesel

I really like your videos ,and can understand alot of your vocabulary. Anyways I have a question that I'm sure you might have seen in you experience. Not sure if you mentioned it, but here it is. Have you ever seen an amperage wave form that drops out and back in? I was testing a 2004 chevy colorado fuel injector with 3.5 liter engine. I was using aes wave's 1 channel scope.

Thanks Sir.

Always great info in your videos,how ever this question has nothing to do with your video....,2014 Chevy Cruze ,AC motor clutch engaged ,Condenser fan does not come on ,Radiator fan comes on when temp sensor gets to 220,,,,but below that temp ,ac compressor is engaged and running but not Condenser fan ..and it's the same fan,Could that be ambient temp sensor reading cold temp ,?

thankss

Opps, I see that you explained this but not in terms of inductance. I didn't allow the video to go further. Just need to think of total impedance rather than resistance.

I know its been 7 years, but what would the waveform look like if there was high resistance on the ground side? thank you for your time and any answer is very much appreciated.

Sorry. This next statement is continuation from prior comment. .... does not drop out on the feed wire to all injectors.

So Peak and Hold injector works like similar to an LED light 💡 bulb and a Saturated injector similar to an incandescent light 💡 bulb?

thanks....

If you have an injector with a weak magnetic field strength what does that mean bad injector or weak power feed?

hello, I have a very special situation .... my zero is -45V (not 0 or close to zero but minus 45v !!) it lasts 1ms and goes up to 108V (lasts less than .5ms). How is this possible?. I checked the oscilloscope several times. Its a Nissan Pathfinder VQ30

peak and hold injector ,this system is used on the GDI system. can you do a case study on a GDI fuel system

Hi Paul is it safe to perform injector balance test on peak and hold injectors with injector tester. I have 1987 porsche 944 with injector problem. Will I burn good injector if I use injector tester to test flow. Hope this question make sense. Thank you.

Scannerdanner, to sum up ur book would u say it mostly revolve around scope testing?? Can someone without a 8 plus grand scope utilize your book?

Would it be dangerous to energizes a peak and hold injector with a fuel injector tester which pulses or just to energizes it with a constant power/ground?

I know this video is old now but maybe someone will see it and my question... Since the voltage waveform shows the injector commanded on time (i.e. the commanded pulse width), shouldn't that time also match the DC current waveform from mechanical pintile opening dip to mechanical pintile closing dip on the voltage waveform?

Buenísimo.

I am trying to find the video where you found a injector falling out and you were showing the difference between duty cycle and pusle width. I have not been able to find it.

how does it look an open fuel injector waveform?? does it have a hump?? whats the measurements?

It would matter if the battery Is losing Voltage.

Alright Paul, where is your autobiography?

my gdi has three peakes...its an old mitsubihi

(this car does not start)

This

Like si lo quieres al menos con sub títulos en español... Gracias