Antilock Brakes / Traction Control Systems: Application and ID

PSM 5.3 and 5.7

Introduction

PSM 5.3 (Porsche Stability Management)
Diagnosis software number: PSM04XX

911 Carrera 4 (996) as of model year 1999 (x)

PSM 5.7 (Porsche Stability Management)
Diagnosis software number: PSM05XX

911 Carrera (996) / 911 Carrera 4 (996) as from model year 2000 (Y)

NOTE: PSM was first installed as standard in the 911 Carrera 4 in 1999. This system is marked by PSM 5.3. System PSM 5.7 is installed in the 911 Carrera 4 and on request in the 911 Carrera 2 from 2000. The scope of functions is the same in both vehicles. The booster pump of the 911 Carrera 2 is not located at the hydraulic unit as in the 911 Carrera 4 but on the opposite side at the front end of the vehicle.

For a perfect functioning of the system, the following points must be observed:
- The battery must be securely connected.
- The brake fluid level must be at the correct level.
- The system must not leak.
- Tyre size, air pressure and the condition of the tyres must be satisfactory.