Test point 5: Remedy:
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
Examine battery and generator voltages.
Select Control module supply voltage and Sensor supply voltage in the Actual values menu item, and check the values with the vehicle in reverse gear and the engine running.
Displayed control module supply voltage approx. 12 V
Displayed sensor supply voltage approx. 8 V
Erase fault memory, move shift lever out of reverse gear and switch off ignition. Next, switch ignition back on, move shift lever into reverse and read out fault memory.