How to Test a 2-Wire Crankshaft Position Sensor Circuit?

[OAustin]

Measurement method for a 2-wire crankshaft position sensor circuit: Use the two probes of a multimeter to connect to the two signal wires of the magnetic crankshaft position sensor in any order (since it's AC, polarity doesn't matter). With the engine idling, set the multimeter to the AC 20V range. Generally, the higher the RPM, the higher the voltage. The crankshaft position sensor is usually installed inside the distributor and is one of the most important sensors in the control system. Its functions include: detecting engine speed (hence also called the speed sensor), detecting piston top dead center position (thus also known as the top dead center sensor), including detecting top dead center signals for each cylinder's ignition control and the first cylinder's top dead center signal for sequential fuel injection control.