The article is concerned with detection of leakages in pipelines. The new method of improving diagnostic susceptibility of pipelines has been proposed. The essence of this new method is the acquisition of new diagnostic information (i.e. signals). In contrast to the standard signals (measurement of pressure, flow rate, temperature) used up to day, this information is the measurable signals of weak interactions between objects, resulting from the work of testing objects (correctors) joined to tested object (pipeline). The method has been verified experimentally. On the basis of the results of the experimental research it has been demonstrated that due to these new diagnostic signals it is possible to improve the diagnostic susceptibility of pipelines, and, thus increase the efficiency of leakages detection conducted by means of the methods used hitherto.