How to Test a MAF or MAP Sensor With a Multimeter - Plus an Operations Guide

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Here is a video on how a Mass Air Flow and a Manifold Absolute Pressure Sensor work and also how you can test them using a basic multimeter.
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Due to factors beyond the control of Ratchetsand Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. Due to factors beyond the control of Ratchetsand Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchetsand Wrenches.

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23 июл 2016

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Комментарии : 596

@davidboles9166 7 лет назад

Great job man! I have searched many videos on various car repairs .You have covered 3 of the problems I have had. You rock bro!!

@TheRichardmay1 7 лет назад

By far you are the best channel for learning auto systems. your explanations are simple and clear. thank you so much. also great sense of humour every so often.

@luisaliceaortiz7791 7 лет назад

Richard May thank you for time and efforts I'm always wanting to learn more .stay blessed

@darrylkishii9359 7 лет назад

Richard May Q

@WmTyndale 7 лет назад

Another beautiful explanation. Especially that the IAT sensor is in the MAF in the newer cars. I like your deep knowledge and precise explanations. RECOMMENDED!

@andrewngwenya6837 7 лет назад

This video has actually taught me how to distinguish a MAP from a MAF. Many thanks for the lecture.

@davidsibble7429 6 лет назад

Very very good video..appreciate the attention to theory as well as active repair. Shows true reinforcement to problem solving 👍🏼🙌🏼😎

@StormFlinix 25 дней назад

Been watching your vids for years. You know they're good when I come back and refer to them while on my projects

@donaldhollums3278 6 лет назад

I'm a long time, automotive DIYer and am getting into doing light automotive repair and service side work. I'be watched a few of your films along with DIY Auto Tech and Scanner Danner to help me improve my diagnostic skills instead of just being a parts changer. You have another subscriber, Amigo. Keep up the great work!

@joey243win 8 лет назад

Awesome really helps remember stuff I'd forgotten thank you!!

@IrfanTahir 6 лет назад

your explanation is very precise and simple as well. Great job and thanks

@yannickkay5099 Год назад

After years your videos still educational videos you teach me easy tricks to test a sensor without wiring diagram that's amazing bro... Thanks sooooo much

@froglegs4910 6 лет назад

I LOVE YOUR AUTO REPAIR LECTURE ! VERY CLEAR EXPLANATION AND TRUELY PRACTICAL ! THANKS LOT FOR YOUR UPLOAD VIDEO !

@ashishacharjee8018 3 года назад

U r really good.....I just saw another video by an automotive engineer. Combined with ur video, everything fell easily in place. The engineering info with a knowledgeable technician’s experience.....is the best tutorial.....thanks

@slimeroad 7 лет назад

Very practical video for determining baseline characteristics for each of these devices. Thanks very much from the UK.

@W.Khairi 7 лет назад

Regarding car repair this is one of the best watched so far......its a truly door opener.....Thank u very much

@grullon120 4 года назад

thanks Sr. keep making amazing videos, really appreciate your help

@hollowandfaceless8993 5 лет назад

Thank you bro, this truly helped💯

@richardwallinger1683 6 лет назад

You are definitely the man . at 72 years young I understood everything you were testing .. My VW 2.5 TDI 2001 199,000 miles has gradually lost pulling power .I replaced the old original exhaust with a nice new Stainless de cat system .It was marginally more responsive , but after fitting a pressure gauge to the intercooler housing the measured boost topped out at 11 psi. I was told to expect up to 18psi. The MAF sensor was replaced for testing only and the difference was unbelievable the turbo boost increased as before but then continued to increase easily passing the 1 bar pressure gauge I had plumbed in . now all I need to do is attempt to clean the original MAF sensor and see if it was recoverable . my short journey transport is a 2011 Nissan LEAF . Everyone should have one of those .. they are the future.

@jamesjohnson5700 2 года назад

Can car have both map & maf?

@maxwonttakethetrain142 4 года назад

you have great videos and a good teaching ability! thx for the thorough lesson

@osvaldoumana4494 7 лет назад

super clear.... great video.... thanks a lot!!!! i just got my new OBDII scanner and with this video I hope I can fix my kids car.... next...THE WORLD!!!!!!

@bilalcassim4509 8 лет назад

one of the best mechanics on youtube keep up the goodwork , good videos and always spot on . helps me 100% of the time

@AJTarnas Год назад

awesome work. thanks for the diagrams and the clear instructions.

@politicalfoolsandhorses 2 года назад

So very well explained. Really good. But please note that that MAP sensor is good. It increases the voltage only during acceleration. So if you are doing constant 20MPH it will be 1/1.5 depending on car make - it will go us as son as you decide to go from 30 to 60 and will stay up untill you reach 60 and release the pedal slightly (vacum if you have a vacum meter - many call it economy metres - goes down and Absolulte Pressure returns to normal) and the fuel mixture changes to lean again. At 60 MPH it changes according to the reading of the MAS Airflow Sensor. Anyway - the industry needs more people like you Well done again.

@arniet1 8 месяцев назад

Thanks for that info. Is there anything simple that can cause a map sensor fault that can be easily checked without buying a new map?

@politicalfoolsandhorses 8 месяцев назад

I am not sure I understand your question. 1. Anything simple that can cause a map sensor fault is. The map sensor is located in the inlet manifold after the air filter - it can get dirty / contaminated especially if you remove the air filter and use a gause filter or a filter which is not so good at filtering the air. Very easy to remove and clean. Many videos on U tube - only one screw maximum 2. It is vey reliable but its an electronic part and does not really like engine vibraions - and the engine heat. So it depends which car. On my car it has 153 K miles and never chaned. On my wife car it was changed after 163 K miles. 2. fault that can be easily checked without buying a new map? I would say that anyone that wants to test the electrinc sensors of his car himself, apart from the fact that deciding which sensor, if any, is the core of any issue to sart with; he should buy a Code Reader also called a Scan tool since it scans/checks all the sensor. Thanks to mass prodyctin these are ridiculously cheap - 24 Dollars sometimes even less from the shop than from Amazon. Googel - "car cheap code readers" or Go here: www.google.com/search?q=cheap+engine+code+tester&oq=cheap+engine+code+tester+&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCTIxMDM5ajBqN6gCALACAA&sourceid=chrome&ie=UTF-8 i@@arniet1

@adanarceo4636 5 лет назад

Thanks again brother, very well explained situation about maf sensor, very helpful 👍👍👍

@garymartin8185 7 лет назад

great video simple n direct to the point. thanks

@pedronimuspiace1577 5 лет назад

SOOOOO helpful, thank you!

@goranreljanovic1622 7 лет назад

Great video. You just got a nother sub. keep up the good work. Greteengs from sunny Croatia.

@marcoaaguilera2620 6 лет назад

Very good video -Good instructor & very knowable.

@dc5723 7 лет назад

Awesome video as always!

@DONphantasmo 4 года назад

Great video. Great job!!! Thanks for a nice and informative video!!!

@dondale68 8 лет назад

I do like your videos. Myself, I find some of them boring but I've been working on cars for over 30yrs, but for a novice these are great! Not too much technical detail for them to lose interest, just enough to keep their attention and teach them how to fix their vehicle!

@spike121964 Год назад

Love all your videos. Great work

@cincomorales 7 лет назад

After this video i subscribed to your chanel ! You are always patient and humble thank you for your videos!

@sanjeewaanilkumaralokuhett200 7 лет назад

Thanks for the valuable information provided..

@jettpatton4618 2 года назад

Hey bud I really liked the way you translated this,you made it very understandable because you know your shit. Thanks bud for taking time to share.

@toomuchtruth 8 лет назад

This is exactly the video I need right now as I try to fix my car. Almost like if you made it just for me, lol! Thanks a ton for this!

@myRatchets 8 лет назад

lol nice, glad its useful to you. cheers

@Jan_Seidel 6 лет назад

Cheers. Learned a lot new MAF in 2 minutes!

@AmharicMusicLyricsVideo Год назад

you are a good mechanic u explain with the mechanism how it works also the volt resistance testing failure solution amazing

@amogarage 4 года назад

Great video, helped me successfully diagnose a faulty Map sensor, thanks a million

@Purosanluispotosi 3 года назад

So how u know wen that sensor are bad that numbers stay on place or wen go up

@OverturecervejariaBr 6 лет назад

Very good video. This is the right way to diagnose the fuel injection system.

@intruderIG 5 лет назад

Very clear and useful, Thank You

@tokgaenz 4 года назад

thanks you so much , all your video is easy to understand and educational

@michaelking42 Год назад

Great, great video, thank you for taking the time and effort to make it.

@b8t135 7 лет назад

your video's are awesome keep up the good work.

@nealeng.1063 9 месяцев назад

Thanks for this very informative information. Great details !

@dennislazarte3061 4 года назад

Very useful discussion..Many will learn from your videos.keep it up and many thanks to you👍👍👍

@neilray8416 5 лет назад

Great video! Thank you.

@VELOWCITY 7 лет назад

Thanks for all this info

@SuperMarkcornell 4 года назад

This helps me much...thanks Buddy.

@MrGibratan 6 лет назад

thanks for the info really good video

@tj3424 7 лет назад

Tnx for your greate videoes. Denmark

@saifalikhan3579 3 года назад

Thank you sir, this truly helped.

@TFizl 3 года назад

Awesome video, very helpful

@RNMcustom 8 лет назад

Thanks for your effort in helping us understand how things work.

@myRatchets 8 лет назад

np, glad you liked it. cheers

@mobileexpert8563 4 года назад

Great explanation, thanks

@davidjangisherashvili1829 7 лет назад

very useful ! thank you!

@LukeSchiralli 5 месяцев назад

Great video, very informative and easy to follow thanks!

@robertrupley3254 7 лет назад

Nice Video. Great Info

@thonguyen252 5 лет назад

Nice videos, thank you :)

@nationalistjanataparty9282 7 лет назад

THANK YOU SO MUCH

@johnnyroastbeef84 7 лет назад

Good stuff bruda!

@TeslaReels 4 года назад

Always great video

@joetorres7052 6 лет назад

Great video!!!

@RB-er6gu 3 года назад

Thanks i learned a lot on testing 👍

@ex8280 23 дня назад

Dang 2 Million DiY'ers was helped by this video. Congrats.

@maxkim8642 7 лет назад

Thank you good information

@ansarijaved 5 лет назад

all of your vidios are very easy to understand very helpfull..

@mayamikokayesa171 3 года назад

well done will get the ball rolling great show

@keithjames1682 7 лет назад

Your videos are awesome

@golfnut533 Год назад

Great info, thanks for your efforts. 👍

@33798 4 года назад

Very good explanation of MAP and MAF

@deathxxx1231 Год назад

Precious video! Thanks for that!

@Rabbit.760 4 года назад

Wow you teach better than anybody I know of. So well, that your accent sounds fluent

@marioquimpan4888 3 года назад

Thank you sir for your valuable knowledge share to everybody.

@RoadRunnerMeep 6 лет назад

Great video, very detailed. What were you using to test for a vacuum leak from the N75 valve when you determined there was no leaks. What should have happened if there was?

@leocruz1117 7 лет назад

thanks for your help!

@lorchri14 4 года назад

Working on Onan generator, EFI, so so helpful to understand these sensors and how to test. The manuals only give resistance parameters out of box, not operational.

@smcafee579 4 года назад

good job, keep up the good work ....

@copkhan007 4 года назад

I actually learned something new today...thanx my friend.

@ziaulhassan472 5 лет назад

hi wonderful lecture thank you so much

@seshachary5580 7 лет назад

very educative. thank you. regards

@JohnR9965 8 лет назад

You do great easy to follow vids. Two thumbs up.

@myRatchets 8 лет назад

ty ty

@wyattoneable 8 лет назад

I missed the cut off but I really have no questions. You do a great job at explaining the components and circuitry so it's just a matter of getting out there and experimenting for myself. Thanks.

@Chris-hx3om 4 года назад

No he didn't. He doesn't understand the difference between a 2-wire and a 3-wire sensor.

@bluor3713 2 года назад

@@Chris-hx3om what's the difference between a 2-wire vrs 3-wire?

@Chris-hx3om 2 года назад

@@bluor3713 2-wire is a resistor and the ECM is looking at the current flowing, whereas a 3-wire is a voltage divider where the ECM is looking at the voltage between two power rails. The advantage of the 2-wire is cost, but at the expense of repeatability with varying voltage rails. (Automotive is notorious for quite a range of voltages. Less than 10 under high load without the engine running, to over 14v once the battery is fully charged.)

@AraceaeFanatics Год назад

Very helpful videos.

@carlosgavino6874 Год назад

You are so awesome thank you for this straight to the point instructional thank you

@esperancengaffaousadou9717 Месяц назад

Thank you for the video

@edwardharvey5839 Год назад

I understand everything now, Thanks!

@sohldier1 5 лет назад

great work

@sungsam1318 5 лет назад

Hey morning am a subscriber to ur channel good work

@marks7352 5 лет назад

Thanks for this video. Thumbs up to you

@carlosbah4623 3 года назад

Wow very clearly explained. Good vid. New subscriber here. ¡Gracias!

@veronicathomas907 7 лет назад

thank you I am learning 🙋

@everardocamacho5063 8 лет назад

great videos I like it all,

@wadiesuun2572 2 года назад

Very good video. Thank u👍

@vladimirpetrov9717 3 года назад

The map sensor is fine, when you crack the throttle slowly, the engine spins up, but the throttle does not open further. That causes more vacuum to form inside the intake, typically the map will read about the same as at idle or lower (since the pressure is usually lower). Otherwise cool video!