Method of checking the operability of a tank-venting system

A method for checking the operability of a tank-venting system of a vehicle, the tank-venting system including:

• a tank;
• an adsorption filter having a venting line;
• a first connecting line connecting said adsorption filter to said tank;
• a tank-venting valve;
• and, a second connecting line connecting said tank-venting valve to said adsorption filter, the method comprising the steps of:
• providing a pressure source for introducing an overpressure into said tank-venting system with said pressure source having operating characteristic variables;
• drawing a conclusion as to the ambient temperature from one of said operating characteristic variables of said pressure source and determining whether said ambient temperature lies within a pregiven temperature interval;
• only if said ambient temperature lies within said pregiven temperature interval, then introducing an overpressure into said tank-venting system relative to atmospheric pressure;
• detecting one of said operating characteristic variables of said pressure source as said overpressure is introduced into said vessel to obtain a pressure trace of the pressure in said tank-venting system;
• and,
• drawing a conclusion as to the presence of a leak in said vessel from said pressure trace.