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your explanations are very good . we want more boss

Its pretty ridiculous that its gotten to this just to trouble shoot and repair a car. Used car market is never going to go down people are going to avoid this crap like the plague.

excellent videos was waiting for part 2 of the series i bought the autel ms919 package thanks and god Bless

Autel is a chinese company that steals american companys proprietary information. They just settled a 30 million plus lawsuit for stealing. If your american stay away. Google it prove me wrong.

Thank you it was nice I just bought the new ultra only used it at my shop 6 times I like it I’m still getting used of it

His is the scope i bought there is very little ingo available for them thank you for this any more videos would be much appreciated!

Hello Electron JohnEDC. 17C55 I have a Mahindra tractor 2021 with a Mahindra ECU Model EDC 17C55. Do you know what scan tool works on it? I have the typical OBD2 connector and its a 4 cyl diesel engine. Thanks Mike

Hello John. I have a diesel shop. I’ve been wrenching since I was a kid but now everything is a computer. I bought an Autel MS919. What would be my best resource to understand and fully utilize this tool?

Very helpful, Thank you John

Can you program key fobs with AP2500?

This is the best OBDCII Information I have seen.

thanks for the video, to purchase your tool i went to your website and it is not working.

Yes more videos great information. Thanks for sharing

Great information thanks

I'd love to see more diesel related engine performance diagnostics. Fuel injecors, EGR, DPF, SCR etc. There is a lot of information on petrol engines, but everyone leaves diesel behind.

Excellent video

John, you are doing great work!

Great diagnostics. Please do more advice daignose video. Thank you.

Electron John - you are surely and ACE Diagnostic Technician and certainly and ACE electronic technician who can quickly diagnose engine performance problems from waveform analysis of your signals. Thank you for sharing your vast diagnostic knowledge 🙂. Nothing under the hood scares me from trying to troubleshoot and repair my own vehicles. I have some electronic training and understanding of ac , dc physics. That being said , performing voltage drop testing and sensor signal testing / waveform analysis on automobiles is new to me BUT. I have an AUTEL bidirectional analyzer MS906BT - YOUR VIDEOS are simply fantastic - AGAIN - many thanks 👍 and HAPPY NEW YEAR ✌️🥂

Will this work with the bt 508

thank for the video, just bought the UltraEv. they didnt give me the motortru for a year though. otherwise great scanner

There was a OBD1.5 used by GM. My 94 z28 will not scan on OBD/OBD1 pin connector is for OBD1. Jumping pins on plug will not give code on the CHECK engine light on dash.

Thanks for the upload. Just bought an Ultra and started using it this week. Coming from a 906BT.

Very VERY BENEFICIAL ! Thanks ! 👊🏼 🔥 💻 📈 🔑

Excellent video. Great refresher👍

Much better looking scanner than the @harborfrieght T8 I wasted my money on.

If I'm not mistaken I have seen a Rotkee MT Pro scope on your workshop shelve. What is your experience with it for automative diagnosis?

Thanks for the response. Could you possibly send me a few recomendations for a tester and features?

How can I find the link to this tester and leads. The above product link does not work, and I cannot find anything on the website.

Good video but don’t know why they push against the mobile guys that get training to get it done plus on a more flexible schedule. I can tell my customer just set it outside the door, we can program it after hours. Remote expert is only as good as the “expert” who sat in a OE class that a rep put on thru a seminar that any average person with a business can go to as parts supply houses host these. Really wish the scan tool mfrs would quit pushing against the mobile guys as most mobile guys I know do good work, do self training, invest in tools that some local big shops don’t want to invest in. Also mobile guys save shops time and tying up a tech as when we go in we deal with the service advisors, managers. We bring our own equipment, several thousands dollars worth, knowledge that remote experts aren’t going to see. Have several shops who’ve tried this method but cars have issues that remote experts can’t always fix. Get in the field and do the work!!

Great video!

Good stuff

Thanks. I gave myself an Autel for Christmas. Let the fun begin.

Having watched months of other videos, you have showed me how much I have missed, thinking that there is so much that is assumption after gathering info from meters and scanners, this is something I am not used to, my trade was working on electronic service repairs for the marine service and using an oscilloscope was an everyday occurrence using scopes worth thousands of dollars, even our cct diagrams had expected wave form under different conditions. Having used scan tools, I recently bought, it still left a lot to desire to repair a car, Having only watched 4 of your lectures has just opened everything up, as sone as you pulled out the scopes and showed the waveforms, it now is all starting to come together and making sense, thank you so much, if only we had the $200.00 multi lead scopes back then. We had to use a Polaroid camera with special adaptor to go on the scope to save images. LOL

THANK YOU FOR THE EXCELLENT DEMONSTRATION !!!

crazy yo, youtube has probably taught me more about modern vehicle systems than your average fix it again tony

What about testing on modern cars with coaxial cables?

Thanks!

Very informative and in-depth video!

Hello, I bought this scanner but in Latin America there is no update or how to buy it because it tells me that it does not support my country and I have not received a response from Autel support. I bought the scanner and I have it as decoration.

GREAT video, i am in school for my level 3 in Canana and we are on OBDll and canbus. Lots to know and remember.

Very informative! Thanks John.

Good job!

Well done John Thanks again .. Your knowledge is much appreciated

Your dealers will appreciate this video, John. Very well done, as always. Cheers.

Thank you!!!!

Just subscribed after finding your channel. I just bought a scanner and trying to learn as I go and I think I have found a great teacher to help. I am just a DIYer but am interested to know how these systems woork.

what a jiberish overcomplicated explanation . I will make a You tube channel for the poor people that had to watch you. Inspired me with your nonsense

This is not advanced. This is extremely beginner. Change the title.

For upstream HEGOs (narrow band, switching) closed loop fuel control, the strategy is a switching control (because the HEGO only detects two states, rich or lean) with a long time constant filter or a long time constant PI or PID control loop supplying learned fuel trim data, which is then used as a mean fuel bias level upon which the switching algorithm is optimized. If the learned fuel trims are correct for the current engine operating condition, the fuel switching algorithm will use a symmetrical jump back around stoichiometry, essentially trying to maximize the switching frequency. The upstream HEGO works well for this closed loop control because it is directly in the exhaust stream. The jump back (bang bang) control is not a controlled frequency as output, it will result in a set switching frequency if the fuel trims are perfect and the catalytic converter (CAT) operation optimal. The switching waveform is the result of everything in the control loop. The HEGO signal switching amplitude should not change pre and post CAT like shown in the drawing in the video if the two sensors are identical, and if the CAT was perfect the post HEGO would not switch at all (complete and efficient O2 control) or perhaps be pegged lean. In fact, the intermediate voltages (mid span) of the HEGO output between the normal rich lean switching thresholds are meaningless. So the CAT efficiency (or other such OEM words to describe CAT health, which is crude at best) makes sense only as a relative measure of the pre and post CAT HEGO switching characteristics. So, we can make inference between pre and post CAT switching but not amplitudes. For identical pre and post sensors the output should be the same, registering either rich or lean. This is where understanding the CAT monitor strategy OEM description is very important. Because it may imply that the CAT monitor is a special test pegging rich or lean at a certain point in the drive cycle to understand relative HEGO switching behavior. But, where in the drive cycle for emission would you intentionally control CAT breakthrough, ideally you wouldn't. This is why CAT OBD II monitor (test) is done over two complete drive cycles with specific operating conditions before the test is run. But, we could rephrase this and say the test is so crude that we don't want to set a DTC unless either the CAT or HEGO is spent. To really see the HEGO outputs it is best to directly probe the signals at the HEGOs (use differential scope probes) and not plot scan tool data.