![]() ![]() The Request Message has the ServiceId as first byte, plus additional service-defined parameters. Each service defines a Request Message, Positive Response Message, and Negative Response Message. Upload/Download and Extended services are not part of the Automotive Diagnostic Command Set.ĭiagnostic services have a common message format. Stored Data Transmission (Diagnostic Trouble Codes).The Automotive Diagnostic Command Set supports the following services: ![]() The standard does not define all codes for some codes, the standard refers to other SAE or ISO standards, and some are reserved for manufacturer-specific extensions. The diagnostic services available in KWP2000 are grouped in functional units and identified by a one-byte code (Service Id). 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. ![]()
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