How do you test a Crank Position Sensor on a 1990 Oldsmobile Regency 98?

To test the Crank Position Sensor on a 1990 Oldsmobile Regency 98, first disconnect the sensor's electrical connector and use a multimeter to check for resistance between the sensor terminals; a good sensor typically shows a resistance within the manufacturer's specified range. Next, you can also check for the output signal by cranking the engine and measuring the voltage at the sensor's connector; it should produce a pulsing voltage signal. If the readings fall outside the specified ranges or if there is no voltage signal during cranking, the sensor may need to be replaced. Always refer to the vehicle's service manual for specific testing procedures and specifications.