How to Test a MAF or MAP Sensor With a Multimeter

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

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8 жыл бұрын

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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Disclaimer:
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.

Пікірлер: 596

@davidboles9166 7 жыл бұрын

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 жыл бұрын

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 жыл бұрын

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

@darrylkishii9359 7 жыл бұрын

Richard May Q

@WmTyndale 7 жыл бұрын

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 жыл бұрын

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

@davidsibble7429 6 жыл бұрын

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

@ashishacharjee8018 3 жыл бұрын

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

@donaldhollums3278 6 жыл бұрын

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 жыл бұрын

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

@slimeroad 7 жыл бұрын

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

@W.Khairi 7 жыл бұрын

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

@yannickkay5099 Жыл бұрын

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

@IrfanTahir 6 жыл бұрын

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

@hollowandfaceless8993 5 жыл бұрын

Thank you bro, this truly helped💯

@richardwallinger1683 6 жыл бұрын

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 жыл бұрын

Can car have both map & maf?

@grullon120 4 жыл бұрын

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

@vladimirpetrov9717 3 жыл бұрын

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!

@Puppunanne 2 жыл бұрын

petrol engine , normal ....

@jamesjohnson5700 2 жыл бұрын

Can car have both map & maf?

@TheWindrunner88 2 жыл бұрын

@@jamesjohnson5700 yes

@jamesjohnson5700 2 жыл бұрын

@TheWindrunner88 ok because I can't tell if my 2019 Hyundai Elantra se has one as in maf

@TheWindrunner88 2 жыл бұрын

@@jamesjohnson5700 I’m not sure about those, might be able to google it tho

@froglegs4910 6 жыл бұрын

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

@wyattoneable 8 жыл бұрын

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 жыл бұрын

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

@bluor3713 2 жыл бұрын

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

@Chris-hx3om 2 жыл бұрын

@@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.)

@dondale68 8 жыл бұрын

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!

@adanarceo4636 5 жыл бұрын

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

@maxwonttakethetrain142 4 жыл бұрын

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

@RoadRunnerMeep 6 жыл бұрын

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?

@politicalfoolsandhorses 2 жыл бұрын

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 ай бұрын

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 ай бұрын

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

@osvaldoumana4494 7 жыл бұрын

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!!!!!!

@lorchri14 4 жыл бұрын

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.

@AmharicMusicLyricsVideo Жыл бұрын

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

@toomuchtruth 8 жыл бұрын

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 жыл бұрын

lol nice, glad its useful to you. cheers

@bilalcassim4509 8 жыл бұрын

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

@amogarage 4 жыл бұрын

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

@Purosanluispotosi 3 жыл бұрын

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

@pedronimuspiace1577 5 жыл бұрын

SOOOOO helpful, thank you!

@StormFlinix 27 күн бұрын

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

@observersnt 6 жыл бұрын

Thank you for your clear, simple and methodical approach and for the time and effort you have put into these videos. Please forgive my ignorance, I am, as you will see from this question, still learning: If in the course of probing or back probing to identify wires in any connector, I connect my multi meter with its 9 volt battery to any five volt signal wire, is there not a danger that I may damage or destroy the five volt signal generator(?) or regulator in the ECU?

@stevejohnson8773 Жыл бұрын

No. The meter is designed so as not to damage the circuitry it is testing.

@Johnsmith-zi9pu 4 жыл бұрын

To reduce vacuum you have to apply load or disconnect the vacuum tube. That sensor appears to to be working OK.

@tomreyn3610 3 жыл бұрын

Yea. He is wrong about the MAP. Bad test. Quick rev response was correct. He interpreted in wrong. MAP was good.

@goranreljanovic1622 7 жыл бұрын

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

@marcoaaguilera2620 6 жыл бұрын

Very good video -Good instructor & very knowable.

@RNMcustom 8 жыл бұрын

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

@myRatchets 8 жыл бұрын

np, glad you liked it. cheers

@garymartin8185 7 жыл бұрын

great video simple n direct to the point. thanks

@dc5723 7 жыл бұрын

Awesome video as always!

@cincomorales 7 жыл бұрын

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

@Jan_Seidel 6 жыл бұрын

Cheers. Learned a lot new MAF in 2 minutes!

@DONphantasmo 4 жыл бұрын

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

@sanjeewaanilkumaralokuhett200 7 жыл бұрын

Thanks for the valuable information provided..

@tj3424 7 жыл бұрын

Tnx for your greate videoes. Denmark

@intruderIG 5 жыл бұрын

Very clear and useful, Thank You

@OverturecervejariaBr 6 жыл бұрын

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

@Rabbit.760 4 жыл бұрын

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

@dennislazarte3061 4 жыл бұрын

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

@AJTarnas Жыл бұрын

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

@uguraker8930 6 жыл бұрын

Bravo ; for 1-fluent spoke 2- fully own and controlling science of this subject. 3- loving your jobs 4- your teaching talent(gifted , from God)

@Robbie-Robb 5 жыл бұрын

Hi. Great video! Question? How do I test the MAF and IAP sensor if my car is in limp mode???

@b8t135 7 жыл бұрын

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

@copkhan007 4 жыл бұрын

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

@jettpatton4618 2 жыл бұрын

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.

@thonguyen252 5 жыл бұрын

Nice videos, thank you :)

@SuperMarkcornell 4 жыл бұрын

This helps me much...thanks Buddy.

@ramkumarkj9043 5 жыл бұрын

Can you explain how to connect this voltage readings to common digital voltage readded circuit board (out of vehicles) Thanks...

@neilray8416 5 жыл бұрын

Great video! Thank you.

@sungsam1318 5 жыл бұрын

Hey morning am a subscriber to ur channel good work

@saifalikhan3579 3 жыл бұрын

Thank you sir, this truly helped.

@johnnyroastbeef84 7 жыл бұрын

Good stuff bruda!

@griph9917 6 жыл бұрын

Thanks,actually needed to check some ground wires didnt know how,great!

@The_JDM_Dynasty 8 жыл бұрын

Brilliant stuff, very useful for me. Thanks

@myRatchets 8 жыл бұрын

np, glad you liked it. cheers

@kenken-zj6is 7 жыл бұрын

NELKEL GTRp VLOGS

@stephenarling1667 4 жыл бұрын

This is great explanation, and much easier to remember after second viewing.

@ricardoolguin9607 3 жыл бұрын

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@spike121964 Жыл бұрын

Love all your videos. Great work

@billyburns3792 4 жыл бұрын

The reason the voltage didn’t go up when you opened the throttle slowly is because you didn’t lose vacuum until you opened the throttle wider

@VELOWCITY 7 жыл бұрын

Thanks for all this info

@MrGibratan 6 жыл бұрын

thanks for the info really good video

@tokgaenz 4 жыл бұрын

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

@michaelking42 Жыл бұрын

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

@33798 4 жыл бұрын

Very good explanation of MAP and MAF

@marioquimpan4888 3 жыл бұрын

Thank you sir for your valuable knowledge share to everybody.

@stevekellar1403 4 жыл бұрын

GREAT VIDEO ! THANKS ! ANY ADVICE FOR DODGE NITRO ENGINE LIGHT ? (EGR CLEAN & NEW)

@JohnR9965 8 жыл бұрын

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

@myRatchets 8 жыл бұрын

ty ty

@robertrupley3254 7 жыл бұрын

Nice Video. Great Info

@jalilalmteen536 5 жыл бұрын

Hello, I have one Question ? I found some engine oil in side the MAP sensor & makes my car did not working smooth what do u think the problem with the engine ?

@robertvinscent6568 5 жыл бұрын

If your engine oil was over filled than you may have oil shooting up the PCV valve going in and soaking the MAP sensor. Or if your oil is not over filled,,, maybe your PCV valve is gone causing it to soak your MAP sensor. Once the map is full of oil it cannot function properly and the vehicle will run rough.

@mobileexpert8563 4 жыл бұрын

Great explanation, thanks

@TFizl 3 жыл бұрын

Awesome video, very helpful

@akliaithamou268 6 жыл бұрын

Hi im akli from algeria you know what !! You are awesome I hope learn more from you ,I really want to know much more about all engine sensors

@nationalistjanataparty9282 7 жыл бұрын

THANK YOU SO MUCH

@ziaulhassan472 5 жыл бұрын

hi wonderful lecture thank you so much

@Buckwsr 8 жыл бұрын

Great video! What were you using (an aerosol can) to test the vacuum line for leaks? Thanks.

@myRatchets 8 жыл бұрын

starter fluid, be careful as that can catch on fire. Propane is safer.

@unclejediisampsonii3624 5 жыл бұрын

So appreciate what you are doing, Thankyou

@Shamweeniedog10 4 жыл бұрын

Just look it up

@davidjangisherashvili1829 7 жыл бұрын

very useful ! thank you!

@ansarijaved 5 жыл бұрын

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

@manmilescanada4267 7 жыл бұрын

Sir. What does it mean my car MAF's reading is 0? Thanks. Can anyone answer.

@smcafee579 4 жыл бұрын

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

@AguilaJR 8 жыл бұрын

thanks for the video. I'm getting high resistance 50-60 omhs for the ground pin. what could this mean?

@user-xv7eb5ct9f 4 жыл бұрын

Jorge Alberto Romero did you ever get that resolved?

@TeslaReels 4 жыл бұрын

Always great video

@nealeng.1063 9 ай бұрын

Thanks for this very informative information. Great details !

@joetorres7052 6 жыл бұрын

Great video!!!

@maxkim8642 7 жыл бұрын

Thank you good information

@berlisss 7 жыл бұрын

thanks a lot for the video, very informative and in simple words. YET! I beg yourpardon for mentioning it, but! with the paperclips could easilly break the rubber seals securing the connection inside of the plugs (from water or whichever liquids). couldn't you?