How To Test A Mass Air Flow Sensor (Andy’s Garage: Episode - 287)
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- Опубликовано: 1 июл 2024
- In this video, Andy Phillips shows how to test a Mass Air Flow (MAF) Sensor using a multimeter. Knowing how to test this sensor will save you money from buying a new one when you might be able to just clean it.
Below are links to videos that may be helpful:
How To Clean A MAF (Mass Air Flow) Sensor: • How To Clean A MAF (Ma...
How To Test A TPS (Throttle Position) Sensor: • How To Test A Throttle...
Cleaning A Throttle Body: • How To Clean Throttle ...
How To Replace An IAC (Idle Air Control) Valve: • How To Replace Idle Ai...
How To Clean An IAC (Idle Air Control) Valve: • How To Clean Idle Air ...
How To Clean A Variable Valve Timing Solenoid: • How To Clean Variable ...
How To Test An EGR Solenoid: • How To Test EGR Soleno...
Rebuilding An EGR Solenoid: • How To Rebuild & Repai...
How To Replace An EGR Valve: • How To Replace EGR Val...
Installing Inline Fuel Check Valve: • How To Install An Inli...
How To Remove A Valve Cover: • How To Remove A Valve ...
Replacing A Throttle Position Sensor: • How To Replace Throttl...
Replacing Oxygen (O2) Sensors: • How To Replace Oxygen ...
Changing Oil Pressure Sensor Switch: • How To Change Oil Pres...
DISCLAIMER:
The individual featured on the Phillips Vision RUclips Channel identified as Andrew Phillips, also known as Andy Phillips is not a professional mechanic, contractor or certified repairman. He does not have any formal training in the automotive field, or any other trade. He is strictly a Do It Yourself handyman.
Phillips Vision, or the individuals featured on this channel, assume no liability for anything you choose to do to your vehicles, appliances, games or any other items featured in the videos before, or after watching one of the videos or utilizing the content from this channel.
All Do it Yourself (DIY) repairs or modifications you perform are at your own risk. Proper safety precautions are always needed, and are the responsibility of the viewer to follow. In some cases, even if you perform everything properly, you can destroy or damage one or more things you are working on resulting is costly repairs.
In addition, if for some reason, the instructions on this channel are incorrect, resulting it something becoming damaged, Phillips Vision and those featured on this channel WILL NOT reimburse or pay in any way the costs that may be incurred due to following wrong instructions.
PLEASE DO NOT PERFORM ANYTHING SHOWN ON THIS CHANNEL (PHILLIPS VISION) UNLESS YOU FEEL COMFORTABLE AND CONFIDENT TO DO SO. 
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Awesome!! finally someone who finds the actual problem instead of just replacing parts!
Outstanding hand salute from American Legion Dist 14 Cmdr. Southern Florida 🫡🇺🇸🇺🇸🇺🇸🇺🇸
Thanks for taking the time to show how to check the unit.
Just subscribed. Appreciate actual information on problem solving. Not the typical part cannon mechanic
Thanks for the comment and support
Great video, I had to watch it few times to understand it. 😊
Great video. I've just learnt something new. Can you do a video on how to test the O2 Sensors please
It's nice to see how it looks like when you have a bad one. Now no need to doudt if bad or good. Thanks
Thank you for the step by step.
Excellent information and tutorial, thanks.
I agree finally found a real mechanic
Great explanation.
Thanks for that. Much appreciated.
Great explanation
Great video! ❤
Great video
Impressive no guess work I've seen so called mechanics not do those tests and changing buy chance which costs us all .fab guy awesome keep up the good work !!!
Thanks for the feedback 👍
wow. great video. thank you!!
Great video! I was taught when checking continuity does the key have to be off?
Yes
Thank you for an intelligent video
Awesome video
I just tried a web site that for $2 let’s you ask a question of a mechanic so I asked which is the signal wire on a Subaru forester and I got yellow wire pin 5. This info in addition to this excellent video allows me to follow the direction but jump straight to testing…wow this makes it so simple. Thanks for the great video.
👍
what website would that be my friend.. Im trying to teach myself right now and Im kinda stuck
Thank for that video it’s super helpful to me. I don’t need to know the sensor resistance… i Just want to know if the sensor is doing it job. Testing resistance is only relevant, if you want to repair the faulty sensor.
Very helpful thank you
Great video! I will do the same. See how it works. Thanks
I had a mechanic that ripped The Wire off my harness that went to the air mass flow sensor this is a good video
If you mean that the mechanic stripped some of the wire insulation to make connections with a voltmeter (multimeter); then, you got a poor mechanic. Using backprobe pins is the correct way to proceed to make electrical measurements.
I like the machines in the shop. Coin op and slots.
Thanks 👍
Thanks my friend, i enjoyed watching your educational video, except at the point of 6:20 of your video, I'm confused. Where's the ground wire coming from and to where are you connecting to it please?
The black wire on the harness should be your ground. It is at the end of the harness
Have the same question, thanks for your help.
Is it red wire in sensor coupler?@@PhillipsVision
What conclusion did you find after changing the sensor? Please reply.
Will this test work on a hybrid car also...Toyota prius
My 95 lincoln mark viii motor, in my 67 f100 seems to snap and pop and crackle when its cold. I notice it as the temperature gets cooler towards the fall. I've cleaned the MAF but it still does it. Any suggestions.?
Amazon has back probe pins for this application.
Do you place the two probs on eather of the two sensor at the back or do you need to put them on the right ones
Andy have a 2011 2.4 Equinox.Codes saying bad intake and exhaust solinod.Rreplaced but still runs rough making sound out of timing chain cover.When unplug solinod intake. sensor helps.Very confused what wrong.
Is it showing an engine check on the dashboard indicating a foulty maf?
im new to all this. SO im confused what the difference is, to front probe the connector, then back probe it?
So if the volts go from 1.08 at idle to 0 with acceleration that also means the sensor is bad?
Can a good code reader tell the specs in the live sensor reading ?
1999 Toyota Avalon car with a v6 engine that cranked but wasn't starting.
After engine rebuild and gear oil replaced . While test driving by the engineer , smoke started emanating from the engine bay. Precisely, from the fan relay that the car owner connected by himself. Within few minutes, the car shutdown by itself as if fuel is finished.
Presently, it's a crank a crank no start, no spark, no injector pulse, check engine light staying ON with ECU connected or removed.
I tried to scan for DTC codes, but my scanner wasn't communicating. I checked all fuses, power and ground at obd port, those checked ok. but my scanner isn't compatible to read CAN network. There are only 4 wires intact for the obd2 port.
Furthermore, I added fuel through the intake to the engine, no change at all. I checked for spark and injector pulse. These things weren't present. But there was power to injector with just the key at ignition or ACC and COP had 1 ground and 1 power as usual.
With the ECU removed battery connected, Engine light would come ON. with ECU connected check light still comes ON.
Before I left, I checked the MAF sensor 5 wires and noticed that 3 wires were earth instead of 2 and 1 power; no ignition current/ power was available for the remaining 2 wires.
Please, what should I do
to get this car running again?
I AVE MERCEDES BENZ C220 OF 1996 , NOW I AM FACING THE ABOVE PROBLEM, LIKE ENGINE RPM GO VERY HIGH, BUT THERE NO POWER TO PULL THE CAR, ITS STARTED SHOWING THIS PROBLEM RECENTLY, IS IT RELATED TO MASS AIR FLOW SENSER, AND ALSO PETROL CONSUMPTION ALSO INCREASED, ?EXPECTING SOME REPLY FROM YOU,
What were the symptoms? Not being an electronics guy I had a hard time following this.
Won't the PWM pulse width be difficult to see accurately depending on the scan rate of a digital voltmeter?
You say after excluding the 12v power and two ground wires, one is left with the signal wire and sensor ground. . . But of those two, neither tested positive for ground continuity. How could there be a "sensor ground" wire that's negative for ground continuity?
Do I need to reprogram the CU when I replace the MAF with a new one? Thanks, best wishes from Saudi Arabia🖐
No, only if replacing the SKIM or chipped key.
I can hear the song, “ Pinball Wizard.🎵
Is it bad that my ground wires on the mass air flow sensor connector are reading 6 ohms ?
I've always had intermittent issues engine management issues with my 03 Chevy Express. It sat for about 7 years until I recently needed to get it back on the road. It ran fine then it stalled on me and I had a MAF code. I found the tube for the intake popped off the piece that attaches to the throttle body. FFS
Thanks for the great video, Mate. How do you know that the yellow was the signal wire, for the red meter probe to connect to, or does it matter? Could you have put the meter probes on the other way and it would have read negative; or would it cause damage? Thanks again, my friend🙏👍
I found online a diagram of which wires were what
@@PhillipsVision thanks my fry. Would it matter if you put the probes on the other way round, or would the value be the same but negative. Thanks again.🙏👍
@@johnmartin7597 I would test them in the proper order to avoid a bad reading.
Just wondering if you checked out a new MAS for rising voltage to double prove the first one was faulty?
Or just unplug if it dies it's good if stays running it's bad
@@user-ms8xp4dx2k does this work with all maf sensors?
It looks like there are two 4.9v wires?
My harness plug doesn't allow for pin to go in back.
Is it showing an engine check
5 leads wire among 2 leads input ok..remains 3 leads it will check by multimeter is in it sir 👏
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THANKS FOR TESTING M.A.F.SENSER, BUT PLEASE MAKE A VIDEO HOW TO REPPLACE THE M.A.F.SENSER, PLEASE,
I do have videos on how to change it but type vehicle do you have?
Easier test start vehicle un plug mass air flow sensor if it dies
it's good if it keeps running it's bad
Hi Phillip Great video I have a 2009 Murano V6 I replace the fuel pump but still no start spin over good I can hear the pump run when I turn the switch on, can I still check the Mas air flow sensor if it's not running Thanks
Yes, but doesn’t sound like the MAF, could be the fuel system or ignition system. Make sure the injectors aren’t clogged or the ignition coils or spark plugs are bad.
@@PhillipsVision Hi Phillip i check It now I have a U1000 Code on the 2009 Nissan Murano is there anything I can do to fix it Thanks again could one of the sensor be bad
@@juggie396 this code pertains to a Communication Area Network lost communication. It could be a bad ECU or faulty wiring
@@PhillipsVision OK Thanks I'll look into it.
How come you didn't do a before and after test..
That way you could prove that the new sensor works better like what you said that it increases slowly upward...
Is the multimeter probe and the copper wire in the same slot for signal?
Yes
hello there! i have the 2015 verso 1.6 diesel and the check engine light comes on with a p00bd fault code which refers to the mass air filter. i've done everything from changing the maf sensor to cleaning the air intake manifold but the faults pops up again and again. my electrician has inspected it twice and sais there is no wiring problem. any idea what it can be???
The code you are getting can also pertain to a leak in the intake. Did you check that as well?
Can you try to clean the sensor first?
Where do you get the information from about what your MAF sensor's voltage readings should be?
Repair manual.
@@iulianc9037 And that repair manual costs how much money?
Sir…good step by step, however on your back probe description, you put your stripped wire in the sensor line, but what wire/line was the red multimeter probe inserted. Thank you
Can you reply to this please
Yeah I was wondering the same thing. And agree it's otherwise a good video
He definitely didn’t explain this well. From my understanding he backprobed the 5V wire and the only wire left after finding 2 grounds, the 12V and the 5V. That wire would’ve been the one all the way to the left if looking at the front of the connector.
Thanks Carlos!👍👍@@CarlosCastillogearhead
He said right in there what wires to probe go back and watch and listen very carefully @4:10/9:05
😊
20 volts dc
I have ground in all the cables
Is there a fuse for that circuit? Am not getting any power.
I don’t believe there is a specific fuse for the MAF sensor. If you’re not getting power, you may have a break in the wires that need to be replaced. Here is a link to a video I did showing how to find a break in wires: ruclips.net/video/714_57IRwkk/видео.htmlsi=SDTRjuy1pTdckBIc
My maf sensor has 8 wire
Hi I have a 2012 sciom Iq and is ideling I change the throtle but no change on the idle any suggestions pleace
Could be a faulty IAC (Idle Air Control) Valve, or a dirty throttle body
@@PhillipsVision how can I check if the IAC is malfuncioning
@@esdeynnahernandez4964 start you car cold, watch the RPMs. If it’s working fine you should hover around 1.5 RPMs and gradually drop to around 600. You can also take it out and visually test it. The plunger will open and close.
How to clean the MASS AIR FLOW SENSER,CAN YO MAKE A VIDEO ON THAT,
Already did…4 years ago. Here’s the link: ruclips.net/video/rDTWflNHfR8/видео.htmlsi=Rf2ongwwCRy1Lobk
All these videos only show how to test a wire harness for it. How do you check for the resistance on just the sensor it’s self
If the mas is bad here's how.disconnect it while car is running if it shuts off its working if it still runs its bad
i cant keep the motor running it shakes ans dies what can i do ??? thank you
Are you getting any engine codes? Could be the Idle Air Control Valve or a dirty Throttle Body
i get po102 and po113 please help could i have a broken wire some where ?? sensor is brand new throttle valve is brand new@@PhillipsVision
What about a car that doesn't run?????
The car will run without a MAP sensor, albeit rough.
Don’t Chevy’s use a frequency style maf. Meaning unless your multimeter if set to frequency (hertz) it’ll just get an average measurement making this test inaccurate
At back probing You show where you connect the red lead of multimeter. Next you say you Connect the multimeter ground to the other....other what ????????? Ground ? Other back probe? Other. What.????
He trying to say in one of the comment that black and red probes are at same yellow wire which is pin no 1..
at idle? mine wont even start 😂
Same deal here
low throttle high volts high throttle low volts
I had a black wire with 12 volts and a white wire with 4.49 volts or signal wire. Red was my ground. LOL
Since the car won't stay running after starting it, it's difficult to test it. I was hoping for a standardized resistance between the different pins or something like that.