Operating Principle

WARNING: This page is about a different car, the 2024 Porsche 911, 2023 Porsche 911, and 2022 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

The 3rd generation TPM system operates on the principle of unidirectional communication between the wheel electronics and control unit. This means that the wheel electronics can communicate with the control unit, but the control unit cannot communicate with the wheel electronics.

The wheel electronics units send the currently measured tyre pressure, the direction of rotation, the temperature of the air in the tyre and the remaining service life (of the battery) as well as a specific ID from the wheel that is currently turning at specified intervals.

The wheel position is learned automatically from the side and axle specifications. The direction of rotation of a wheel is detected by acceleration sensors in the wheel electronics (left/right detection). Axle sensing (front axle/rear axle detection) is performed based on differentiated sound levels between the front and rear axle, where the central antenna is fitted close to one axle (high level). The levels received from the other axle are correspondingly low.