How to Measure a Two-Wire Crankshaft Position Sensor?

1 Answers
MaddoxLynn
07/30/25 8:05am
Methods for measuring a two-wire crankshaft position sensor: 1. Observe the engine RPM displayed on the dashboard: The engine's speed signal comes from the crankshaft position sensor. If the sensor does not output a signal, the engine tachometer will definitely not move; 2. Oscilloscope testing: Adjust the oscilloscope voltage to 14V and the time to 10ms, then start the vehicle to observe the AC signal waveform; 3. Multimeter testing: Connect the multimeter probes (AC current has no polarity) to the two signal wires of the magnetic crankshaft position sensor. Set the multimeter to the 20V range at idle, and the higher the measured voltage, the higher the RPM. Crankshaft position sensors are mainly divided into magnetic, Hall-effect, and magnetoresistive types, with magnetic types being the most commonly used.
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