As a result of component and manufacturing tolerances, unfavourable conditions can lead to a slight deviation between the starting positions of the eccentric shafts of bank 1 and bank 2 of the Valvetronic.
That means that the calculated stroke of the intake valves is the same on both banks, but the actual stroke is different. This deviation, if correspondingly large, can lead to bumpy engine operation.
On the basis of characteristic variables, the DME can detect different strokes on both banks. Under certain external conditions, the eccentric shafts are adapted in such a way that the actual strokes on both banks are the same. This function is referred to as bank calibration. The bank calibration can also be requested using the DIS tester.