What does speed sensor Nissan 240sx 1990?

The speed sensor in a 1990 Nissan 240SX measures the rotational speed of the vehicle's wheels or transmission output and sends this information to the engine control unit (ECU) and the speedometer. This data is crucial for accurate speed readings, fuel management, and transmission shifting. A malfunctioning speed sensor can lead to erratic speedometer readings and affect the vehicle's performance. Replacing the speed sensor can resolve these issues and restore proper functionality.