Subaru Transmission Speed Sensor

How Does a Transmission Speed Sensor Work?

The operation of a transmission speed sensor involves detecting the rotational speed of the transmission shafts and converting these into an electrical signal. Here?s a simplified breakdown of its operation:

1. Sensing Element: The core component is typically a magnetic or hall-effect sensor placed near a toothed wheel or gear on the transmission shaft.
2. Speed Detection: As the shaft rotates, the teeth or notches on the wheel pass by the sensor, causing fluctuations in the magnetic field.
3. Signal Generation: These fluctuations are converted into an electrical signal that corresponds to the rotational speed of the shaft.
4. Data Transmission: This signal is sent to the TCU and ECU, which use it to determine the precise timing for gear shifts and other transmission functions.