Is a dysfunction is the negative consequence an element has for the stability of the social system.

Yes. Dysfunctions, in sociology, are negative disruptions of social life or of the social system. They always have a negative effect on society. Dysfunctions can be manifest or latent. Manifest dysfunctions are those that are anticipated. For example, an important event might cause higher levels of traffic. Although this is a negative consequence, it is one that was to be expected. Latent dysfunctions, on the other hand, are unintended consequences. For example, if someone missed work because of the traffic jam.