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.
   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.

   5. 3.5. Erase the fault memory  .

      Select >>Fault memory<< >>Erase fault memory<< in the menu.

      Follow the instructions on the Porsche System Tester.

      Levelling system calibration is complete!