Service Done Right #13: Mass Airflow Sensor Testing – Is The Sensor Lying To The ECM?

#mafsensor #massairflow #volumetricefficiency #delphi #autorepair #troublecode #dtc #fixitright

The Engine Control Module is responsible for many things but it can’t do its job if the information provided to it isn’t accurate. And on vehicles equipped with Mass Airflow sensors as the primary load sensor, this happens more often than you think.

Want to know how to make sure the MAF sensor on your customer’s car is doing it’s job? Watch this edition of "Service Done Right"!

Show the world you were "Born To Wrench"! Check out our official MA T-shirts:

@@@ YES - I WANT MY FREE SUBSCRIPTION TO MOTOR AGE! @@@

@@@ TRAINING FOR PROFESSIONAL TECHNICIANS @@@

@@@ FOLLOW US ON @@@

@@@ VISIT OUR WEBSITE @@@

@@@@@@@@@@@@@@@@@

Due to factors beyond the control of Endeavor Business Media, it cannot guarantee against unauthorized modifications of this information or improper use of this information. Endeavor Business Media assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Endeavor Business Media recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Endeavor Business Media, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Endeavor Business Media.

The tool and/or equipment featured in this video was supplied by the manufacturer and may or may not be retained by the reviewer at no cost.

[theadorephaedon]

I wish you taught classes for Automotive, I’ll sign up in a New York minute! Very informative. Thank you for your time and for your best knowledge.

[petar]

I've read an article from your collegue Scott Shotton how to modify the VE calculator and get accurate number on turbo engine. If one works on a turbo engine you just need to gather what the pressure in the intake is while doing the VE test run. You can either use factory MAP sensor if equipped or install pressure transducer. Collect the map sensor data in "psi" reading. Then multiply the reading by 2 in order to convert in "inHg". Then add the calculated number to the current barometric pressure(inHg), at the altitude the test drive was performed. Then input this final calculated number in the VE calculator "barometric pressure" input. Man i love MotorAge 👍🎸🔧🥃

[FieldmouseMechanix]

Loved the video, I watched it three times to take notes and still don't know how you fit that much information into such a short video. Well done. I found the download link for the VE spreadsheet in the comments. It is definitely going in my diag computer!

[orvilledanvers]

I've read and watch your videos...they are very interesting and informative...I really learn a lot from these videos

[TheLoneWolf_andCoyote]

Thank you pete for this educational tuning video it's amazing how one individual sensor can make or break you.

[oldschool]

Thank you Pete for sharing your time and knowledge.

[yupcrazy...]

Now that's a new one I've never heard or even considered diagnosing specific sensors in global OBD2 because of the difference in the data...

[syncrosimon]

Great information that few seem to know, many thanks🏴󠁧󠁢󠁳󠁣󠁴󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿

[bigdzxr]

thank you for the spreadsheets which i will be using it for TS (trouble shooting) my sister in law 2012 Camry 2.5L with MAF (Low input) P0102

[uvgotbjoking]

What excellent knowledge, best on YouTube 👍. My maf on a 2.2 litre diesel saying at idle once at running temperature 7g/s and jumping to 12 g/s with an audible change in engine tone when switches from 7 to 12 by itself so definitely wrong reading straight away at idle. Going do test suggested first though too 👍

[antonispapaioannou]

Superb explanation and testing . Thank you. Please send the maf testing sheet.

[deankay]

Great explanation of what is happening and what to look for. If you scanner cost less than $100, most likely your are seeing "Global PIDs" as required by law. Fun fact?
This was a value test we rigged with a voltage drop on the ground side at GM training centers in 2002, but even more relevant today as fuel prices increase. And never forget engine wear, compression, intake leaks, timing chain stretch and incorrect tire size will change load values! Great video...
DK, ASE master, retired.

[AutoBioTech]

Thank you sir for sharing your knowledge

[oluwatobikomolafe]

Very useful. Thanks for sharing. Will like it if you can share the excel document.

[bobwhite]

Does this work the same with diesels? Like gen 4 Ram 6.7L. being a diy, I am trying to gain all I can about my engine. thanks for sharing your information.

[abdulwahedy]

My car skoda Octavia TDI 2018 shows 3 codes, P0103, P0341, P0113, what part should i replace?

[MrCoda]

Would be great if I had and expensive reader like you do but he wants to spend that kind of money to use it once a year or once every five years

[josiahvonb]

Would if you have a rough idle to stall issue and while the engine is running, you disconnect the MAF sensor and the vehicle will idle almost perfect, you can plug it back in and the engine will remain idling good and drive good but as soon as you turn the vehicle off or disconnect the battery then restart it the rough idle returns until you disconnect the MAF sensor again. The vehicle is a 5.3 silverado 08, this is all happening with a new MAF sensor since I just replaced it when the engine started acting up. I have been chasing this problem for quite some time and have replaced sparkplugs wires, coils, tps and I decided to check out the MAF sensor again when I discovered this anomaly. I don't know whether to get another MAF sensor or chase down wiring.

[bbmd]

Hey, Pete. Since the MAF sensor is the primary source for calculating absolute and calculated load, can you just look at the calculated load value pid and make a decision based on it? Over 85 % is what I heard is okay for non- turbo or supercharged engines.

[alexcoellor]

thanks for this video, and woul like to have access to de spreadsheet