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, the entire hydraulic unit must be replaced.
- 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 9588 and carry out a test drive.
- After the test drive, read out the fault memory with the Porsche System Tester II 9588 again.
CAUTION:
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!