PSM (Porsche Stability Management) is a stability control system that has been used since Used for Porsche models since 1998. Initially it was available as an option. It has been standard equipment on every model since 2003 and optimizes the performance of a number of important safety systems. It improves the vehicle's handling and stability during maneuvers and provides reliable traction on slippery surfaces.
How PSM works
The PSM sensors record the following parameters:
- Speed and direction of the car
- Yaw rate
- Lateral acceleration rate
- Speed of the wheels
- Steering wheel angle
- Brake and accelerator pedal position
If the vehicle's actual direction of travel deviates from the desired direction, the system recognizes which axle the spinning wheels belong to and brakes the other axle. To do this, the ABS hydraulics are activated. It pumps the working fluid into the appropriate brake circuit, which triggers the brake mechanism. In this way, the direction of travel of the car is restored. PSM can temporarily limit the engine torque to avoid slipping.
In addition, PSM controls the electronic differential lock of the wheel differentials. It distributes the torque so that the wheel with the best grip receives the most power.
Popular Porsche models with PSM
- 911, 996, 997, 991 and 992;
- 718 Cayman 982;
- 718 Boxster 982;
- Panamera 970 and 971 ;
- Macan 958;
- Cayenne 9PA, 92A, 9YA and 9YB.
Causes for defects
- Steering wheel angle sensor malfunction;
- Hydraulic power steering pump malfunction;
- Defective ABS sensors;
- On ABS pump motor brushes abrasive wear;
- Defective battery.