The invention concerns a procedure and a device for controlling an air supply system of a combustion engine with an exhaust gas system and an exhaust gas purification system with a particle filter in the exhaust gas system, whereby a boost pressure of an air supply current is controlled or can be controlled in the air supply system over a combustion air supply duct with the aid if a throttle valve and/or an exhaust gas recirculation between the exhaust gas system and the combustion air supply duct. Regarding the procedure it is provided according to the invention, that the air supply current is determined directly before or during a regeneration of the particle filter by different means with the aid of signals from measuring devices that are arranged in the air supply system and/or sensors that are arranged in the exhaust gas system and that the results are compared to each other. With the procedure and the device defects as leakages in the air supply system of the combustion engine can be diagnosed and thus the regeneration of the particle filter interrupted if necessary before it can be damaged by uncontrolled air infiltrations.