This paper presents the Secure Routing uses Trust Levels (SRT) scheme in Node Transition Probability (NTP) protocol to provide secure routing in mobile ad hoc networks based on hierarchical trust levels. In this scheme, the nodes in the network fall into one of the three lists; ally list, associate list and acquaintance list based on the degree of trust. The trust calculation process involves grouping of nodes in the network based on the parameter called Trust rate. Based on the level of security needed for the data, the nodes in a specific security level are made active for routing depending on their trust value. This scheme does not use any key management technique.