Technician A tests an MAF sensor with a scan tool by watching for erratic changes in flow while the engine idles. Technician B checks an MAF sensor by tapping it lightly with the handle of a screwdriver while watching the waveform on a lab scope. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Both techniques described by Technician A and Technician B are valid methods for testing the functionality of a Mass Air Flow (MAF) sensor. Technician A's method involves observing the data from the sensor for any erratic changes that could indicate a problem, while Technician B's method involves a physical test to see if the sensor's output changes unexpectedly when lightly tapped, which could reveal issues like loose internal components or intermittent connections.

Technician a Tests an MAF Sensor with a Scan Tool