Using Engine Data to Separate True Airflow Problems from Sensor Errors
In this Tech Tip Short, Erik Screeden shares a practical diagnostic approach for identifying mass airflow sensor diagnostic issues using a volumetric efficiency test and fuel trim analysis. Rather than jumping straight to mechanical teardown, this method helps determine whether MAF sensor drivability issues stem from true engine breathing problems or inaccurate sensor inputs. By understanding how underreported airflow affects fuel trims, technicians can quickly focus on diagnosing lean conditions caused by a faulty or contaminated MAF, supporting circuitry or unmetered air. This clear, step-by-step MAF sensor testing technique saves time, prevents misdiagnosis and improves repair accuracy.
Watch the full Tech Tip Short to see how combining VE data and fuel trims can streamline diagnostics and get vehicles back on the road faster. For more information, visit https://autozonepro.com/enginemanagement.
About the Author
Erik Screeden
Technical and Multimedia Content Director
Erik Screeden is the Technical and Multimedia Content Director for the Vehicle Service & Repair Group. Erik is an ASE Master Automobile Technician with L1, and L4 credentials, who has been in the industry for over 25 years in various capacities. During that time, Screeden was a technician. He started out at a Ford dealership and continued to several independent repair facilities as well as spent time in the specialty aftermarket at a GM-specific performance shop. After his time as a technician came to an end, Screeden transitioned into a role providing scan diagnostic and J2534 tool support. He was then able to parlay his experience as a technician and a support specialist and use that in several technical sales roles.
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