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 the level sensors are intact, the specified vehicle level must be set gradually (required values:

   > 4495TW - ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT

   ).

   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 the 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 + setpoint 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.

4. Perform Height sensor system component test  (vehicle is adjusted to the required value on the affected side of the vehicle).
   1. 4.1 Select >>Maintenance/repairs  << >>Height sensor system component test  << in the menu.
   2. 4.2 Follow the instructions on the Porsche System Tester.
5. Perform height sensor calibration. 
   1. 5.1 Select >>Maintenance/repairs  << >>Height sensor calibration  << in the menu.
   2. 5.2 Follow the instructions on the Porsche System Tester.
6. Determine the actual value of the height of the vehicle body at the measuring points and enter the determined values in the Porsche System Tester.
7. Perform Height sensor system component test  again (vehicle is now at the required level).
   1. 7.1 Select >>Maintenance/repairs  << >>Height sensor system component test  << in the menu.
   2. 7.2 Follow the instructions on the Porsche System Tester.