The basic setting will make sure that there is no air trapped in the additive system, and should only be performed when:
Replacement of the additive tank.
Replacement of pipes between the additive tank and the fuel tank.
After refueling an empty system.
Test prerequisites:
Ignition on, engine off.
All electrical loads should be switched off.
Battery voltage above 12 Volts.
Procedure:
Start the function, press OK.
A dialog box presents: operation succeeded/ failed.
If the function fails, check test prerequisites and repair possible fault codes.
Exit the function and disconnect the diagnostic tool.