Mercedes-Benz Actros - Calibrate level control (fully air-sprung vehicle with lift axle)

Performing level calibration of the air suspension on the Actros
Calibration is very important for reasons of safety alone!
The vehicle automatically adjusts to driving height as of 30 km/h.
If the level is not correctly adjusted and the driving height is too high, ...
... the body may not pass under bridges which could result in a nasty accident.
If the vehicle level is too low, then the spring travel is also correspondingly shorter.
This can cause the frame of the Actros ...
... to come into contact with low curbs.
Correct calibration of the driving height is only possible ...
... if the Actros is on a level surface. You will also need a pit.
First perform a careful visual inspection of the sensor linkages.
At the front, there is a sensor which measures the height at the front.
The linkage on the sensor may not be damaged or bent.
Otherwise, an incorrect value will be sent to the control unit.
There is also a sensor with linkage on each side at the rear.
Neither the linkage nor the attachment may be bent or damaged.
The tire tread is also important.
Check whether the tread depth is adequate at all 6 tires.
Before starting calibration, connect the battery to a power supply.
The vehicle must also be connected to an external compressed air supply.
There must be sufficient compressed air in the reservoirs during calibration.
Now connect Star Diagnosis.
You also need the measuring station with test pressure gauges.
Connect the Actros to the individual pressure gauges at the respective test connections.
The connections are labeled and the hoses have colored markings.
The pressure gauges do not have to be connected in any particular order.
It is simply important to remember which gauge dial is displaying which pressure.
First select the "Trucks" category in the category selection on Star Diagnosis.
Then select "Automatic model series access". The data is collected. Confirm with F3.
Continue with F2 and then select "Direct control unit access".
The chassis number and kilometer reading are now displayed. Again, press F2 to continue.
Access the control unit "RM Rear module".
Then select "Control unit adaptations" and confirm with F3.
You first have to perform pressure sensor calibration.
Follow the instructions on the screen.
Important: The trailing axle must be lowered all the way down for this procedure.
Lower the trailing axle with F5.
Then, the vehicle has to be lowered all the way down. Activate this procedure with F5.
All of the air must be released from the front and rear air bellows.
Observe the three relevant pressure gauges.
The pressure should now be roughly 0 bar.
If so, confirm with F2.
bar calibration is then performed.
Pressure sensor calibration is now complete.
Use the handheld operating unit to set the Actros to driving height.
Go back by pressing F2.
We now continue with the actual level calibration.
That is also selected here. Pay attention to the safety information.
The next screen displays the prerequisites for ...
.. successful level calibration. Read these through carefully.
Continue with F2 and then lower the lift axle all the way back down with F5.
Confirm with F2.
You now have to raise the vehicle all the way up at the front and rear.
Press and hold the F4 and F7 buttons respectively.
You will now need the spacers. WIS document AR32-22-W-9000C tells you ...
... which spacers you need for which particular vehicles.
You must fabricate the spacers for the front axle yourself using a piece of U-shaped steel.
You can find the relevant dimensions for these in the WIS document.
Insert the spacers at the front and rear between the frame and axle.
Now lower the vehicle on to the spacers.
Press and hold the F5 and F8 buttons respectively until the Actros contacts the spacers.
The three pressure gauges for the front and rear should then display approximately 0 bar.
To calibrate, press F2 and then press F2 again.
Then raise the Actros to the upper stop at the front and rear.
The bellows pressure in all air spring bellows may not be greater than 2 bar ...
. on an unladen vehicle! Press F2 to continue.
Press F2 to calibrate.
You now have to remove the spacers.
The last measuring point is the lower stop.
Lower the vehicle to the stop.
The pressure gauges should again display 0 bar.
Calibrate again with F2.
Level calibration is now complete. Exit with F3.
Finally, everything has to be taught in.
To do so, select the teach-in process. Pay attention to the safety instruction.
Press F2 to continue. Then the Actros does a bit of "dancing"!
You must press the arrow button repeatedly in quick succession.
Do not allow the bar to disappear completely.
Once you have set the correct driving height, the trailing arm ...
... should be at an angle of approximately 90 degrees relative to the suspension. Check that this is the case.

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