Conditions For Carrying Out Calibration

Information 

> 4495TW - ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT

• Calibration can only be carried out while vehicle is stationary. 
• Calibration is also required for vehicles with steel spring suspension. The angle sensors for headlight beam adjustment are calibrated during the process. 
• Before starting calibration, the vehicle must be adjusted to Normal level and the Height sensor system component test must be performed. 
• During height sensor calibration, the vehicle will be raised and lowered and then balance itself out. 
• Check that the tyre pressure is set in accordance with the respective tyre specifications. 
• The vehicle must stand "floating" on the measuring platform to avoid straining the axles. 
• The measured values for the vehicle height must correspond approximately to the values specified under Adjustment values for suspension alignment. If an implausible value is entered, it will not be accepted. For the current comparative values for the vehicle height, please refer to the adjustment values for suspension alignment. 
• Calibration must not be cancelled. If calibration is interrupted, the fault code 000286 "Customer service mode not complete" remains stored and is active. A warning appears in the instrument cluster. In this case, >>Drive links/checks<< must first be performed in the menu on the PIWIS Tester. The fault memory must then be cleared and calibration must be performed again. 

Calibration must be performed if one or more of the following situations apply: 

• Control unit was replaced.
• Level sensors were replaced.
• Height values of the vehicle deviate from the required height values, Vehicle lies to one side after being raised. If lifting platform mode is activated, carry out a test drive (lifting platform mode switches off and the vehicle corrects itself). If this does not work, check the system for faults and then calibrate the system.

Level sensors are calibrated by determining a correction value (corresponding to the actual height of the vehicle) and storing it permanently in the control unit.