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 level sensor and rear level sensor for damage.

   > WM, 947819 REMOVING AND INSTALLING FRONT ANGLE SENSOR FOR HEADLIGHT BEAM ADJUSTMENT (HBA)

   > WM, 947919 REMOVING AND INSTALLING REAR ANGLE SENSOR FOR HEADLIGHT BEAM ADJUSTMENT (HBA)

3. If level sensors are intact, the specified vehicle level must be adjusted in steps.

   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 instead of the unaccepted actual value.

      Example: 

      Height measurement results in 460 mm (18.0 in.) at the front left.

      Actual value: 460 mm (18.0 in.); setpoint value: 414 mm (16.3 in.).

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

      (460 mm + 414 mm)/2 = 437 mm (17.2 in.).

      Enter 437 mm (17.2 in.) into the PIWIS Tester  .