How to Test a Three-Wire Crankshaft Position Sensor?

1 Answers
FinnLynn
07/29/25 5:35pm
Methods for testing a three-wire crankshaft position sensor: 1. Observe the engine RPM on the dashboard: The engine speed signal comes from the crankshaft position sensor. If the sensor does not output a signal, the tachometer will definitely not move; 2. Multimeter testing: Connect the two probes of the multimeter to any two signal wires of the magnetic crankshaft position sensor. Set the multimeter to the 20V range at idle speed. The higher the measured voltage, the higher the RPM; 3. Oscilloscope testing: Adjust the oscilloscope voltage to 14V and the time to 10mS, then start the vehicle to observe the AC signal waveform; 4. Use a diagnostic scanner to read the engine RPM data stream.
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