Transmission Range Sensor

In a Toyota hybrid vehicle, the Transmission Range Sensor, also known as the Park Neutral Reverse (PNR) switch, is a critical component that communicates the gear selector position to the vehicle's control systems.

This switch is typically mounted on the transmission housing and detects whether the driver has selected Park (P), Neutral (N), or Reverse (R).

It sends this information to the vehicle's Engine Control Unit (ECU) and other related systems, ensuring proper operation of various functions such as starting the engine, engaging the parking lock mechanism, and activating reverse lights.

In hybrid vehicles, this switch also plays a role in managing the power distribution between the electric motor and internal combustion engine, especially during transitions from stationary to moving states.

By accurately reporting the gear position, the PNR switch enhances safety, prevents unintended vehicle movement, and ensures the seamless operation of the hybrid drivetrain.