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. 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.

   947819 REMOVE AND INSTALL FRONT ANGLE SENSOR FOR HEADLIGHT BEAM ADJUSTMENT (HBA)

   > 947919 REMOVE AND INSTALL REAR ANGLE SENSOR FOR HEADLIGHT BEAM ADJUSTMENT (HBA)

   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.

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

   Required value:

   > 4495TW ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT

   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 vehicle height is 460 mm and the measured value is not accepted during height sensor calibration.

      Actual value: 460 mm; required value: 414 mm

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

      (460 mm + 414 mm)/2 = 437 mm

      Now enter the value 437 mm for the front left height in PIWIS  Tester.