System test

Special diagnosis routines can be run with this menu item.

1. Using the Porsche System Tester II 9588 select menu item System test.

   The following conditions must be observed for the system test:

   • Vehicle speed < 10 ^km/h
   • Engine start detected and 10 seconds elapsed since engine start
   • Terminal 15 supply voltage OK
   • Sensor power supply (5 V) OK
   • Engine temperature < 110 °C
   • Outside temperature > 3 °C
   • No fault stored
   • Engine idling
2. When the conditions mentioned above have been met, continue with "FORWORD" button.

   The following tests are performed:

   • Display of all segments in the control module.
   • The drive motors are traversed across the entire range once.
   • The measured positioning travel is subjected to a plausibility test.
   • Two different voltage values are set on the fresh-air blower and tested.
   • The A/C circuit is tested via the DME.
   • All fault paths are tested, and any faults are stored.
3. After the System test is finished, the following text appears System test completed successfully. Display fault memory with the "FORWORD" button..
4. Then press the "FORWORD" key, and if necessary remedy the displayed fault.

   After the system test, the air conditioning system regulator reverts to the state it was in before the test was carried out.