Calibration procedure

→ Prior to disconnecting the control unit, switch off ignition and remove ignition key.

→ Ensure that the power supply is not interrupted during programming.

→ Connect a battery charger with a current rating of at least 90 A to the vehicle battery.

Adhere strictly to the information provided under "Conditions for carrying out calibration"!

Always carry out the "Calibration procedure" step-by-step  until calibration is complete!

1. Fit measured-value pickup Quick clamping device WE 1621  on the relevant wheel.
2. PIWIS Tester II 9818  must be connected to the vehicle before starting the Tester. Switch on ignition using original remote control (hand-held transmitter).
3. Apply electric parking brake.
4. Close the doors and tailgate.
5. Erase the fault memory  .

   To do this, connect the Porsche System Tester. Select >>Levelling system/PASM<< >>Fault memory<< >>Erase fault memory<< in the control unit overview.

   Follow the instructions on the Porsche System Tester.

6. Perform Height sensor system component test  .

   Select >>Maintenance/repairs<< >>Height sensor system component test<< in the menu.

   Follow the instructions on the Porsche System Tester.

7. Perform height sensor calibration  .

   Select >>Maintenance/repairs<< >>Height sensor calibration<< in the menu.

   Follow the instructions on the Porsche System Tester.

   Information 

   Check the following at the height measuring point on the front axle: 

   • Lower edge of the wing is covered by the front lid  .
   • Only measure the height on the front axle when the front lid is open  .
   1. 7.1. Determine the actual value for the height of the vehicle body at the measuring points.
      1. 7.1.1. When determining the height of the vehicle body, the height is measured from the lower edge of the wing to the upper edge of the measured-value pickup, dimension X  .
      2. 7.1.2. Then add the radius  of the measured-value pickup 32.5 mm  to this measured dimension X.

         Sample calculation: 

         Measured dimension X = 430 mm; measured-value pickup radius = 32.5 mm

         X  + measured-value pickup radius  = height of vehicle body 

         430 mm + 32.5 mm = 462.5 mm

   2. 7.2. Enter the determined values in the Porsche System Tester.

      If an implausible value is entered (actual value is not accepted by Porsche System Tester), please refer to the information under: "Procedure: Measured actual value is not accepted".

8. Complete the diagnostic session (only for steel springs) 

   Select >>Drive links/checks<< >>Completion of height sensor calibration<< in the menu.

   Follow the instructions on the Porsche System Tester.

   When calibration is completed successfully, >>Result  << >>Function completed  << is displayed!

When calibration is complete, the vehicle does not adjust automatically to Normal Level. The height values can only be checked after test-driving the vehicle.

Procedure: Measured actual value is not accepted 

Information 

During height sensor calibration, a height value that is entered may not be accepted by the Porsche System Tester.

In this case, at least one value is implausible, i.e. the value is not within the tolerance range for the vehicle height stored in the control unit.

The reason for this may be as follows:

• An incorrect calibration was carried out previously (e.g. by entering an incorrect measured value)  .
• A level sensor is faulty (e.g. due to a bent level sensor linkage or holder)  .

1. Measure the vehicle body height again.
2. If the measured values are identical to the values measured previously, check the front and rear level sensors for damage. Check, in particular, that the level sensor linkage or holders are not bent.

   If the level sensors are damaged, these must be replaced and the calibration must be repeated.

   → 431855 REPLACING FRONT LEVEL SENSOR 

   → 431955 REPLACING REAR LEVEL SENSOR 

3. If level sensors are intact, the specified vehicle level (required value: → 4495TW ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT ) must be set step-by-step.

   Information 

   The Porsche System Tester accepts height values with a required value tolerance of +/- 25 mm.

   If the measured value is not within this tolerance range when adjusting the vehicle level step-by-step, the limit value that is closer to tolerance range must be entered as the Actual value in the Porsche System Tester.

   1. 3.1. Enter the mean value determined from the actual/required value at the affected vehicle position (front left, front right, rear left or rear right) instead of the unaccepted actual value.

      Example: 

      The height measurement shows that front left vehicle height is 430 mm and the measured value is not accepted during height sensor calibration.

      Actual value: 430 mm; required value: 464 mm

      (Actual value + required value)/2 = mean value 

      (430 mm + 464 mm)/2 = 447 mm

      Now enter the value 447 mm for the front left height in the Porsche System Tester.

   2. 3.2. Perform Height sensor system component test  (vehicle is adjusted to the required value on the affected side of the vehicle).

      Select >>Maintenance/repairs<< >>Height sensor system component test<< in the menu.

      Follow the instructions on the Porsche System Tester.

   3. 3.3. Perform height sensor calibration  .

      Select >>Maintenance/repairs<< >>Height sensor calibration<< in the menu.

      Follow the instructions on the Porsche System Tester.

      1. 3.3.1. Determine the actual value for the height of the vehicle body at the measuring points.
      2. 3.3.2. Enter the determined values in the Porsche System Tester.
   4. 3.4. Perform Height sensor system component test  again (vehicle is now at the required level).

      Select >>Maintenance/repairs<< >>Height sensor system component test<< in the menu.

      Follow the instructions on the Porsche System Tester.