Two technicians are discussing how to test a permanent magnet vehicle speed sensor. Technician A says that you should test the coil's resistance and compare it to specification. Technician B says that you should set your DVOM to the " DC volts " scale to test the sensor's ability to produce voltage. Who is correct?
A) Technician A only
B) Technician B only
C) Both technicians
D) Neither technician

Question

Quizplus · Accepted Answer

Technician A is correct because testing the coil's resistance of a permanent magnet vehicle speed sensor and comparing it to the manufacturer's specification is a standard procedure for assessing the sensor's condition. Technician B's approach of using a DVOM set to "DC volts" is not appropriate for this type of sensor, as permanent magnet sensors generate AC voltage when the vehicle is moving, not DC voltage.

Two Technicians Are Discussing How to Test a Permanent Magnet