How to Test a Mass Air Flow MAF Sensor - Without a Wiring Diagram

Thank you for your videos. You have helped me do timing belt,water pump,head gasket and test the MAF sensor on my 2004 vw Passat wagon. 1.8t.

Thanks for a video that didn't have a shop with expensive equipment and tools.

thank you for sharing your reliable information with us , I did not know how to check MAF sensor , now I know thanks to you.

Fantastic explanation. Easy to understand. No unnecessary prattle. I'm inspired to work on my car.

Exceptional video! Explained well without all the extra dribble 99 out of a 100 how to videos have. Maybe you should do a how to video on how to make a how to video, he he.

Thanks for making a video, but you might have wanted to point out that this only works with MAF sensors that vary voltage on their output, where most will vary the frequency. The latter you would need an oscilloscope to get a useable reading. So, it would be difficult to know which type you have which would negate the useability of this testing method. My particular MAF sensor varied frequency, and so it just had a constant 2.8v that didn't vary with rpm. The new one was an non-varying 3.1v. Thankfully the new one did fix my problem, but the testing method didn't work in my case.

Thanks for this awesome video continue in these episodes we thank you from the bottom of our hearts

Simplest and most accurate explanation so far.

Very nice step by step for beginners with the multimeter like me! Thank you very much!:)

Nice and easy steps to identify the MAF wiring

Wow!!! thanks for all the tips/info... Couldnt have done it without You!! Many thanks,bob

Thank you for these videos you are a great teacher ..

Awesome. Thanks. So now that I know how to test....if I have a new MAF sensor and new wire harness and figured out which wire is the sensor wire, and the sensor wire stays at 10. No fluctuate with throttle. Yes my truck runs like crap. Chevy 2500hd 6.0 gas 2002

great video. I am confident I can get this sorted out now. I think the replacement unit they sent me is bad too. Sigh.

Simple and straight forward. Love the content

Thank you for these videos, clear and very good explanation.

Hello, there. Great video andn really well explained. I have a w203 c180K 2004, and since last year when starting the car, it started taking longer than usual and the car started to have misfires when in lowgear and it seemed it like it would die... Took it to a mechanic and he disconnected the maf sensor, and the problem stopped "chocking" but the start still takes a long time when i turn the key... I bought a new MAF sensor to replace it, and lo and behold, the problem persisted.... So I so some of your videos of how to test the maf. And guess what i found. On the first step, when looking for the 12v pin (it has 04 pins), i tuned the key on, grounded the multimeter, and set do 20dcv... and guess what i found... 12v on 03 pins and 0v on one... Now, my questions is.... What might be the problem? I live in Brazil, and where i live there aren´t many people that understand how german car works. Got any tips for me? Thanks and looking forward to a reply.

Good info, good details. Thanks for posting.

Very helpful. The holes in my wiring harness are too tight to accommodate a nail, and the paper clip ends are too blunt to get in next to the wire. I used a couple sewing pins, which are kind of T-shaped. They're sturdy, yet you can bend them away from each other once the pin end is inserted. I imagine pulled-open safety pins would work, too, or even straight pins. I tried using twist-tie wire, but it was too weak to allow it to be pushed in far enough.

very well explained. thank you!