AN INDICATOR ARRANGEMENT

摘要

The method according to the invention comprises steps for recognizing a fault in a system used in connection with a piston engine. Amonitoring step (31) of the method is carried out for monitoring the amplitude fluctuation of the signal of the knock sensor arrangement. The second step (32) is made for comparing the amplitude of the signal and a certain limit value and the third step (33) is for detecting any faults in the knock sensor arrangement on the basis of the said comparison. The apparatus according to the invention is arranged to carry out the steps of the inventive method.