PSM 5.3 and 5.7

PSM 5.3 and 5.7


General instructions/safety instructions

The following points must be observed during vehicle diagnosis:
- In the case of some faults in the PSM system, the Tiptronic transmission may switch to limp-home because it is lacking several important data.
- In the case of a defective control unit in the PSM 5.7, the entire hydraulic unit must be replaced.
- The control unit is separate from the hydraulic unit in the PSM 5.3 and can be replaced without the hydraulic unit in the case of a fault.
- In the case of a defective pressure sensor, the entire hydraulic unit must be replaced.
- When replacing the hydraulic unit, the control unit must be coded and the steering-angle sensor must be calibrated.
- The steering-angle sensor must be calibrated for all work on the running gear.
- After troubleshooting or repairs, erase the fault memory with the Porsche System Tester II No. 9588 and carry out a test drive.
- After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again.
DANGER:
Danger of damage due to improper handling of batteries and control module plug connections.
- Disconnect the battery connection terminals only when the engine is switched off.
- Start the engine only when the battery connection terminals are properly connected.
- Pull off or push on plug connections for the control units or other electronic components only when the ignition is switched off.
- Disconnect the negative terminal of the battery before welding work on the vehicle.