Diagnosis and Understanding: MAF Sensor Pt1 Analog, Digital, Hotwire, P0101 P0102...
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- čas přidán 28. 06. 2015
- It's back to the DEBOK for the most comprehensive tutorial on the MAF sensor you'll find.
Become an expert in air induction diagnosis with this video!
Part 2 is here: • Diagnosis and Understa...
Other videos on my channel on induction and stoich maintenance:
Fuel Trim: • Secret of Engine Probl...
MAP Sensor: • MAP Sensor Diagnosis a...
TPS Sensor: • TPS (Throttle Position...
Air Fuel Sensor: • Air/Fuel Wideband vs O...
IAT Sensor: • IAT ( Intake Air Tempe...
IAC (mentioned): • P0171 Case Study from ... - Auta a dopravní prostředky
There are zillions of youtubers with their massively edited useless videos and on the other side there is this boy who is killing it with a micro white board and pen
hahaha thanks man!!!
Aint that the truth.
I told my dad about the wonders of DIY videos and the horrors of the same "hey, heres 45 minutes of my life story and a camera angle of the floorboards, good luck getting to the info" type of videos.
Therezs a channel of all 2-5minute MAX home appliance diag and repair videos. They straight up tell ya "this video covers diagnosing the stove heater pots, go to video X in this playlist for how to remove the panel."
Then just BOOM, right into the info you seek.
They are my heros.
Also, that was Dads first full irate into tranquil repair and DIY Internet info searching project.
Old dog, sure, but hes still got some new tricks..😂
Wish I could remember the channel, at the moment.
They are so good, ya just sorta get your info and move on.
If I can find it in my 1000 plus subscribed channels, ill try to edit it in here.
Edit: AppliancePartsPros is the youtube channel.
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Absolutely on point explanations. First class educational video, just what is needed on CZcams. No techno babble, no pie-in-the sky theory, just sound detailed advice.
As a friend once said, there are plenty of parts swappers in the world but few true mechanics. You sir, are a mechanic. Thanks you for the education!
Thanks 👍
I'm in awe at your ability to explain all of this so clearly. Thank you so much and please - keep these videos comin'!
+DanTheCarMan Thanks man! there will definitely be more videos!
This is an absolutely fantastic video and education! When you have a great teacher its incredible how exciting the learning experience can become for the student and how far they might go. What a great feeling it is to truly begin to understand how things really work! THANK YOU for taking the time to teach us as you do!
Thank you for your Diagnosis and Understanding videos. Your explanations are really clear even for a French who don't speak english fluently.
I realy would agree that your video of fuel trim is by far the single most fascinating of all on thr internet. So simple, yet so very complex. Awesome, just a brilliant upload.
findvoltage Thanks man. This is still my favorite video by far on my channel. Maybe 95% of engine performance diagnostics start with or involve fuel trim analysis.
Dear Matt. Thanks for all the fantastic videos. I have watched 1000´s of hours of Automotive DIY videos on CZcams, but I find your videos the most informative, and I love your scientific approach. Many thanks.
Wow, thanks!
The best car video channel on youtube Matt,
I learned many things from your videos about sensors & many other things which you always talking about in middle of your videos,
I'm not a mechanic, just an ordinary guy who like cars & watch you from Saudi Arabia,
Big like & big thanks Matt,
You are the best ...
Thanks man!
Automobile systems mastery training. Like a boss! Thank you sir!
If only more people (including many professionals) would watch your diagnosis and understanding videos they would really up their game to another level! To be honest Matt all of your diagnosis and understanding videos on engine management systems are the best on these subjects. You have a unique teaching ability that even diyers can easily understand. Such a shame that more people do not take advantage from what you are offering ...
Thanks man! Good to see you back by the way!
@@SchrodingersBox hello. Could you give me adwise what could be with my car. Somethimes it starts jerking when i am driving ( sorry for my english). It is diesel car. After scan. There isnt any error.
@@projektaielektrotechnika3654 sorry idk about diesel engine but it's looks like miss fire... well I think you fixed it bc the comment before 3 years ago..
You're a good teacher Matt. Your explanation was clearly and easy to understand. Thanks for information sharing I hope you're getting well.
Love the way u explain things in very simplified way and quick to understand
We need good people like u in our society.
Thanks Matt
It's my pleasure!
Before I move onto part2 I just want to let you know Matt that I appreciate what you are doing. I like how you are getting at the fundamentals. I have always learned best by getting a good grasp of how something works and then the troubleshooting just comes naturally in my case. Like Danthecarman said your explanation, the way you break it down is spot on and it makes it so much easier.
I was going to join the scannerdanner monthly subscription and I still may, but for where I am at as far as knowledge right now, I think your channel is going to help me out more. I'll soon be joining your monthly subscription. Take care!
+Micscience Thanks man, most people don't see what I try to do.
In all fairness danner's pay channel is excellent and I have many, many people tell me they watch my material to actually help them understand Danner's material (not my intent but I can see how that might be a consequence of my channel).
I suggest the free trial on danner's channel and watch a few videos- then watch my pay channel videos on similar topics (cam and crank sensors for example)- then REWATCH the videos from Danner's channel. You will most likely end up subscribing to both channels lol.
Thanks I spent 400$+ on my car for codes at AutoZone and watch your fuel trim videos and bought a 120$ Bosch scan tool and found out it was a intake leak and not ant of my sensors but now I know thanks to u
My New Favorite Chanel , Absolutely a wealth of knowledge on how the sensors operate & Correlate with each other And the proper way to diagnose my Vehicle, THANK YOU Matt !!!!!
Wow, thanks! Glad you found me!!
Killer video! Great info with detailed explanations that I could actually keep up with! Thanks!
you've enlightened a lot of viewers, thank you...
Hey Matt, I'm new to you're channel. Watched a couple videos and plan on watching the rest. Great extensive knowledge. Awesome how you go in depth and make it easy to understand. Good attitude good videos keep up the great work! You the man
Glad you found the channel!
Just 4 minutes in, and subscribed. As an engineer (but very illiterate about cars), your style totally resonates with me. I'm hoping this video will answer my questions about my car's bad MAF sensor that I am currently dealing with, so I can make an educated decision.
Great to hear!! People like you are exactly the target audience I am aiming for!!
Great video with excellent and comprehensive explanation. My thanks and appreciation.
You make fantastic videos for us DIY guys who don't want to pay someone $100 an hour to guess and throw parts at our car. Thank you very much!
great video. Ive met alot guys who don't understand the science and logic behind it all. they just know how to swap various parts out quick enough to make the boss happy. they don't even wanna touch it. might hurt they're heads from to much thinking
Awesome videos. Will watch and study all of them. Love knowing how thing work.
I enjoy all of your videos. Very informative and helpful. Keep it up
love your knowledge skills wish there were more techs this way that could help me. i could really use you input on my car issue .
These are the kind of videos I like. Very informative, reminds me of A/C Tech School.
Oscar Segundo These are the kinds I like too, and the kinds I learn the most from myself. They are pretty rare- most people will just disregard a video over 3 minutes in length lol
Thank you !!! You are amazing good to explain theese things. From this video i finaly understand why, in my Peugeot 207, the MAF voltage was 2,5v compare to the ground and 10v aproximatively compare to 12,5 Volts of battery. Because is a Frequency MAF. I have installed a kind of device for controlling some sensors , for increase the mileage.( That's because i have installed a HHO Hydrogen cell on my car ). Now i will try to connect that device to MAP sensor and the second IAT sensor who are near the intake engine. ( it is the first IAT, near the MAF , after the air filter) . First i will verify if the MAP have a voltage output... I can't find the Oxygen sensor(s) in this car. Or maybe they don't exist. It's a Peugeot 207, 1600cc , 110 HP , Turbo-Diesel , 2006.
Great videos, keep up the good work.I have enjoyed every one !
There really ain’t words that say holy shit thank you enough! Your fuel trim vids are enlightening at the very least. I’m sold on your channel, 5 thumbs up!
Thank you! I try to keep a high standard for content here lol.
Good shit! I heard a woman on a video on your ch. call you 'Mr. Molecular Biologist!" You must be a prof. What do you study? I'm SO glad I came upon this resource. I'm brand new to autos. I was a research tech. in Biomed. @ Pitt. I've learned SO much compared to any other auto vids. I've watched. And, I've only watched 4 so far!. Thanks, again. Looking forward to it!
The people who come up with these ideas are.............engineers!
I are wun!
Good teaching sir.
Very well explained , i love it. Love all your videos .
You're the best man ! Real teachers / instructors, should be jealous .
Very great presentation. More mechanics need this kind if training especially in my country. Very few goes to school or have formal training. Your at there mercies and when you do find a good mechanic you have to pay through your nose. Thanks for making theae video.
@Renee Redwood I’ve been a mechanic for 42 years and want to be an electrician, you would not work for the wages we get , ps all this shit on motors is why they are never out the garage
Such a great explanation. Thank you so much. I can’t wait to see part 2.
Glad it was helpful!
now I know what is the different between the analog and digital signals and how to understand each one, Big thank you matte now I am going to watch part 2.
j georges Part 2 is a good application for Part 1. Even I get thrown a curveball 5 minutes in lol.
Always a pleasure !
FYI. It's not necessary to have an oscope to read the frequency signals. A fluke 289 will read the frequency, amplitude and duty cycle and even read PWM all on one screen in numerical values. Not as good as an oscope. I have an oscope too but it's AC powered with I think tends to induce unwanted noise into the trace. I would like to get a snapon modis. Love the videos, great job.
Thanks for this analysis. II ended up replacing the MAF Sensor to no avail. Your explanations video help demonstrate how a trouble shooting diagnosis procedure can improve. The symptom was the engine turning and starting before shutting right off. Unplugging the Mass Air Flow Sensor made the 3.3 GM V 6 run okay. At some point I looked over everything I touched when trying to figure out how to access spark plugs for cylinders 1 3 and 5. Upon doing so I noticed a loose bolt that was securing a vacuum source that I learned to identify after referencing the service manual. The following day I heard a hissing sound and found a broken tube that connects to the evaporator canister. I used electrical tape to help provide a seal to the bolt attached to the vacuum source since i over torqued it and bent the piece inward. Then I used electrical tape to help secure the vacuum hose leading to the evaporator canister. The car finally starts up and idles okay. Now there is a DTC 22 (Throttle Postion Low) that I am waiting to see if it goes away after driving and re- learning by the computer now that there are little to no vacuum leaks.
Just simply Check the fuel trim to confirm if the vacuum leaks are gone.
i found that the vaf sensors are quite reliable (i think i replaced four in 28 years, three had bad fuel pump switches, never had problems with carbon build up) i think the biggest drawback is slow response time and i suspect they are more expensive to manufacture.
thanks for this VIDEO! It seems a faulty/aged MAF sensor is creating a random P0300. I cleaned it initially- but finally just installed a new one yesterday and the performance is appreciable. Less $$ than I thought. DIY.
i really appreciate videos like this,thank u sir
Man u Are Mechanincal Professor Respect From Pakistan
Massive knawledge man! I yelled out potentiometer when you mentioned vane sensor lol
Excellent. Congratulations!
thank you for your time and effort.learning alot
Brilliant video! Thank you!
Wow!! Amazing!! I’m hooked on your videos
Awesome! Thank you!
Dear Matt
Many thanks for your afford and the informations you shared with us. I have been searching the net for a long time and I haven't found the detailed and well structured infos like you share. Please add some about diesels especially.
Since I am driving a Ford Kuga (MY2013/ 2.0 tdci AWD) and having troubles with hesitation at low rpms (like after giving a way in a roundabout)
Again many thanks
amazing.... amazing ....amazing.... Thank you very very much ....
awesome explanation. You should explain how the MAF produces the 1-5 volt signal back to the ECM in relationship to air flow past the Hot wire.. You explain how the Hot wire receives varying current to maintain a certain temperature via the 12v wire. But what does the 5v reference get processed with in order to send the relative signal back to the ECM?
This guy is an awesome teacher professor!!!
Wow, thanks!
really good teaching. thank you so much
Hello, thank's a lot for sharing your knowledge i really appreciate it you had teach
Me so much in a so simple way that i have become a much better diagnostician thank's to you keep up the good work blessings!!!
jorge muñoz Thanks Jorge, I will continue doing this
your presentation is very good ..thanks
There IS no easy way around it. But the time you take to watch these videos will give you an understanding of how these modern engines run. It will also save you a ton of money buying parts YOU DON'T NEED and actually zeroing in on the cause of the problem. I.E... the CHECK ENGINE light comes on. An error code trips it.... could be an O2 sensor. But it doesn't mean the O2 sensor is bad necessarily. There are many reasons an O2 sensor will send an error code. This applies to many other sensor and codes also. This is the value of Matts videos. If you LIKE buying parts you don't need, chances are good you'll be gone in 5 minutes. But believe me man....I used to do EVERYTHING on the old pre-ECM engines. Early '80's. V-8's, Slant 6's, Straight 6's, 4 bangers. Could do anything on them. Blindfolded. Then....I lost my garage due to divorce moved to L.A. I didn't open a hood in 2+ decades. In 2017 I bought a 2005 500 Limited with the 3.0L Duratec DOHC V-6. When I opened the hood I didn't know what I was looking at. It was a WTF moment FOR SURE!! But I knew, bottom line, it was still AN ENGINE. I bounced around CZcams, watched lots of "HOW TO" videos and bought parts that did NOTHING. Cleared the Check Engine Light and thought I was good. A few days later the light would come back on WITH THE SAME CODE!! So frustrating man. Then, thankfully, I found this channel and learned more than I could ever tell you here and I still am. But I'm not intimidated by these engines anymore because of Matt. Doing my own work again and come back often for refreshers. The best automotive channel on CZcams HANDS DOWN on understanding the WHY instead of the HOW to do a job. A huge difference. Thanks A MILLION buddy!!
Thanks for the great comment. You totally get it man. Congratulations and happy diagnosing!!
Man, you are a national treasure !
Hahahaha a national treasure omg lol!!!! Too kind of you.
Good video thanks for sharing your knowledge
Amazing! Thank you!
Your vedios are very useful to me in diagnosis. Thanks a lot
Glad to hear it!!
Very good video. Thanks
Fantastic video, thank you
Guess im the only non advanced diy mechanic who listens to this but this is awesome, thanks !
Thank you!!! Very easy to understand and I have a hard time learning.
So do I actually.
Hello Matt!! Excellent stuff!!! At 6:22 the engine does not maintain stoich. at all times, it runs lean at decel, rich at WOT and most vtec and direct injection engines work lean at partial loads low rpms... In fact the more advanced the engine, the less time it operates at stoich and homogeneous combustion (as lean modes require stratified mode as you most likely know)... Just a thought! Cheers!!
PS: i'm inclined to watch the fuel trim video (it is the best) with my classroom... will give you feedback if i do so...
You are good teacher thanks to share God bless you
Sir u r more than a professional.
Pretty clearly elaborated all the possibilities.
That's really wonderful actually
Goodness me your energy level is absolute remarkable more than a Boss
Got an issue with a MAF sensor on my Ford, so I kicked off by searching for videos on MAF sensor testing. What was I thinking? When will I learn that, for proper diagnosis of engine faults, there's really only one guy. Ok, ScannerDanner is good, but this guy takes the biscuit. It almost seems ironic that the best automotive teacher on CZcams is also the most under-rated. Forget the others, just filter your search results to include only those from Schrödinger's Box.
very educative. Thank you regards
Thanks for watching!!
Thanks Matthew.
Your english is very clear,keep it up
Thank you! It’s funny but I get this comment a lot from people who don’t speak English as a first language. They all say my clear and correct use of English helps them understand the material better. I consider it a great compliment!!
You're crackin me up, Kenneth! lol
your awsome man thank you so much
exelent explainer thanks lot mr.
The frequency can be easilly be measured by your ear with small speaker connected thru 1k/10k resistor. You will simply hear the frequency. This is usefull for those who doesnt have an osciloscope.
+Tomáš Kamenický (ViaExplore) Thank you ! I will try this. It's an interesting idea ! Wow. The speaker thru the 10k resistor and the ground ,i think.
Interesting idea
Great video!
great work thanks a lot
It's a mistery for me how a man so smart, and who can talk so rapidly, and without verbal mistakes, can have such a bad writing. 🤣. Anyway, thank you for all new things that i am learning from you every video!
Hahahah. I have heard all my life about my terrible writing and horrific drawing ability. I guess I am just 100% left brain and no right brain lol
great information.. thanks..
I cameback to rewatch this after your recent MAF videos.
There is nothing that scares me more than not knowing what the maf reading should be.
In diesel they operate differently, I guess.
Yeah I used to think the same actually- “what should the MAF read?” But what I’ve learned is that on an analog MAF- all that matters is the voltage. If the MAF voltage is not at least 4V at WOT- there’s a MAF issue. That’s all that matters.
Now on a digital MAF you can’t really do that so it’s definitely more of a challenge.
Thanks for an extremely thoughtful & through explanation. I was having trouble understanding the hertz output but I think I do now. I will watch this video many more times.
Good for you bro!!!! Yes most people (myself included) have to see material like this several times before it sinks in. Once it does- you'll never forget it.
awesome REM reference
u reminded me with my first lesson in telecom engineering 🥰
now im studying mechnical
Anyone else catch that he introduced himself as MAF? Nice Freudian Slip...not a true one, but the phrase has slowly changed to mean that something you're mind is working on came out. So cool. :)
Purposeful or not.
Spoiler alert didn't ruin anything. As you hinted at 7:20 about about another non scan tool test I was all smiles. :)
DE Nichols Hey DE- send me A PM your next chance.
great video, thanks sir
Will also be purchasing the Autoingenuity scanner program.
great video pal
Very well done
Another great video with lots of good information! I haven't run into one of these vortex sensors yet; looks like I'm gonna have to do some research! I think I might have heard something about their existence in passing several years ago, but that's it.
On an interesting side note, your mention of O2 sensors reminded me... Pick up an old (or new) analog voltmeter! I think Harbor Frot still sells them. Scopes and GMMs are nice and all, but sometimes it's easier to just toss an old analog meter on the thing. It's definitely cheaper, especially for the DIY guy that doesn't want to drop $1,000 on a low-end scope. :)
Just for fun I put a analog DMM on the MAF after the video just cuz I was curious and it read exactly the same as the digital DVOMs.
Schrodingers Box Yeah, I would expect as much. MAF frequencies are just too high for the physical mass of the needle and assembly to respond to. They tend to do well with O2 sensors and various other sensors too, though! :)
Love this video bro
I Appreciate that!!
good effort
thnx much .
Most common DVOM's will only do 1 second refresh rates (1 Hz). That means you can only have 1 signal change per second. Any faster than that and the DVOM is no longer reliable and only an oscilloscope will be able to measure the digital signal. Understanding electronic concepts such as frequency, amplitude, and modulation is crucial in understanding the limitations of using a DVOM on things like a digital MAF or O2. Comes down to the right tool for the right job. You wouldn't use a screwdriver where a sledge hammer is needed right? Brilliant video so far. Really enjoying this.
***** Is that right? Only 1 Hz? I had no idea... I thought maybe at least 10 or 20hz but thats crazy! Man How in the world did I live with only a DVOM all this time lol!!
Schrodingers Box It can vary depending on the DVOM. More expensive top of the line Fluke meters can track frequency around 400Hz. Most common cheap meters (under $100) are only 1Hz yes. They are designed for measuring voltage not frequency. Frequency is a premium feature. I think more specifically it's like .98 of a second or something like that. Close enough that it's basically 1Hz yeah. That's why they're so cheap compared to Fluke's and other meters with advanced features.
***** Lol, you are to DVOM's what Danner is to the Verus lol. I never even knew any of that. All I know is Fluke looked like a gyp at $400+ lol. Now it makes sense. I always thought I was expected to pay for a name and the ability to keep the high/low reading lol
Schrodingers Box There's certainly brand cost like Apple associated with it. You are right about that but it does have more valuable and powerful features. The line conditioning inside the meter is much tougher too. Quality components.
Schrodingers Box I'm definitely not that good with DVOM's. I know more about them then how to actually use them lol. You are probably better with them than I am. Seriously.
my 05 silverado threw the code P0102 so i immediately went out and bought a new one...just kidding haha. surprised i missed this video.
Good show
Appreciated 👍 very well done and good explanation very simple and to the point .
I have a problem if you can help me out please ,
It’s a Range Rover sport 2010 3.0 diesel.
1-Starts straight away
2-engine light is on and it’s on limp mode
3- throwing code p0193
4-change the high pressure fuel rail including the sensor
5-changed map and maf sensors
6-car won’t rev past 3
7-max speed goes up to 70mph
8-drops the rev and speed when going uphill
9-sometimes on a flat road it drops the speed to 20mph and rev won’t past 2
10-recently got it services and changed all the filters including fuel filter .
11-i have got a cheap OBD scanner and saw a fuel pressure on live data it shows 22000 and it’s still won’t go up and down when rev .
12-when sudden floor the gas paddle it will drop the speed rev won’t go up it feels like fuel not coming or exhaust is blocked ,fuel or exhaust system feel squeezed .but if rev it slowly /gradually then it picks up speed until I floor the peddle but when release the paddle half way up then it feels bit of ease .
13-sorry for the very long message but I wanted some help desperately and wanted to describe as much as possible .been to land hover specialist and few other garages but no joy ,some say it’s an electric issue and some say it’s a high school reassure fuel pump and some say it’s a turbo or pcm issue but no 1 is able to figure it out exactly ..
( I have a short video uploaded as well on CZcams ) any help would be appreciated.👍
Do you have a digital or analog MAF?
best vid thanks
Good explanation on HZ frequency of MAF..i have the multimeter with hz measurements so have you happened to use that with this and calculated the frequency?
my multi-meter has several added features for measuring: Auto-range, Temperature, Frequency, testing Diodes... I got it as a gift, but I think it was fairly expensive.
Paul MvN Yes I have seen those but out of my price range for sure. Gosh I so seldom need anything other than V,A and Ohms I just can't justify the cost, especially now with my Vantage.
very good