Scan Tool Testing and Procedures

Control Module Function, - As Of MY 2002

Replacing the air-conditioning system regulator and flashing display

NOTE: If the air-conditioning system regulator is replaced, the display flashes after the ignition is turned on. In this case, the system test must be carried out first. The air-conditioning system regulator hereby learns the upper limit stops of the drive motor and the entire system is checked simultaneously.

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 degrees C
- Outside temperature > 3 degrees C
- No fault stored
- Engine idling

2. When the conditions mentioned above have been met, continue with >> 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 [>>] button.

4. Then press the >> 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.

Modify coding
This menu item is used to retrieve and change the coding of the following functions:

Modify Coding:

Procedure:
1. Select the menu item Modify coding using the Porsche System Tester II 9588. (The table listed above appears.)
2. The display can be saved using the F4 key.
3. Using the buttons up and down select the coding to be modified and continue using the >> button.
4. Using the buttons up and down select the correct coding and confirm using the Coding ( F8 ) button.
5. The upper right display changes to the new coding.
6. For coding overview, return using the button <<.
7. Select another coding (see Step 3) or end the procedure using the button <<.