For KWP2000, the Automotive Diagnostic Command Set supports only the ISO TP (standardized in ISO 15765-2) and manufacturer-specific VW TP 2.0 transport protocols. KWP2000 runs on CAN on various transport protocols such as ISO TP (ISO 15765-2), TP 1.6, TP 2. The transport protocol splits a long KWP2000 message into pieces that can be transferred over the network and reassembles those pieces to recover the original message. You can run KWP2000 on several transport layers such as K-line (serial) or CAN.Īs KWP2000 uses messages of variable byte lengths, a transport protocol is necessary on layers with only a well defined (short) message length, such as CAN. KWP2000 describes the implementation of various diagnostic services you can access through the protocol.

The KWP2000 protocol has become a defacto standard in automotive diagnostic applications.