Similarly, inductive sensors like crankshaft and camshaft position sensors generate AC voltage signals. Here, the analysis focuses on the amplitude and frequency of the wave. The "missing tooth" pattern on a crankshaft reluctor wheel must be distinct and repeatable. If the amplitude of the wave is too low, the engine control unit (ECU) may fail to detect engine speed, resulting in a no-start condition. The scope reveals not just that the sensor is failing, but often why —be it excessive air gap or internal resistance.