A wireless network is nothing but a group of nodes that transmit the data from one place to the other, the transmission takes place with the help of ad-hoc network. The network is temporary and dynamic so that the network do not have any security and are vulnerable to attacks at high possible conditions. That attacked nodes are called malicious nodes these nodes act as a selfish nodes which does not pass the data and which results in the decrease of performance. In order to increase the performance the malicious node is detected using the AODV routing protocol and in order prevent the attack, the consensus algorithm is used to prevent the data from getting attacked .In this paper we survey innovated techniques to detect Selfish nodes for MANET. Finally we provide some directions for further research.