Method for the functional diagnosis of an exhaust recycling system on an internal combustion engine

The invention relates to a method for diagnosing an exhaust gas recycling system of an internal combustion engine according to the preamble of patent claim . The invention relates to the diagnosis of an exhaust gas recycling valve, whereby, on switching off the internal combustion engine, the throttle valve and the exhaust recycling valve are closed and a check is made of whether a compression is detectable in the cylinders of the internal combustion engine, by means of an engine speed check within a segment. Should an engine speed difference (Ndiff) be greater than a threshold value (Ndiff SW), then an incompletely closed exhaust gas recycling valve is recognized, assuming a complete closure of the throttle valve.