What Causes the Engine Speed Sensor to Malfunction?

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Engine speed sensor malfunction may be caused by issues with the sensor's wiring leading to the engine control unit. If the wiring is intact, inspect other components. Below is additional information: Engine Speed Sensor: The engine speed sensor is an inductive sensor that captures engine speed and the precise angular position of the crankshaft (input system). A dedicated signal wheel for the engine speed sensor is installed on the flywheel. Design Principle: The signal wheel is designed as a toothed wheel divided into 60 segments. As the signal wheel passes the sensor, it generates an alternating voltage whose frequency varies with speed. The frequency indicates the engine's rotational speed. Sensor Function: To identify the crankshaft position, the signal wheel has a gap between two segments. The engine speed sensor detects engine speed. Together with the Hall sensor, it identifies the top dead center for cylinder 1 ignition, thereby determining fuel injection timing and ignition timing.