Keyword Protocol 2000

KWP2000, an acronym for Key Word Protocol in 2000, is a common protocol for automotive electronics, which is defined in ISO 14230. It was originally intended only for the diagnosis of electronic control units, see also in vehicle diagnosis system. Some services of the KWP2000 are however also used for this purpose today, to load new software in control units ( reprogramming ).

In modern vehicles, there are a variety of electronic control devices for monitoring and controlling individual vehicle components nowadays. Through a network of these devices can send messages to each other. To diagnose a device connected to this network Workshop and test equipment (eg, GT1 for BMW, VAS5051B at VW, DAVIE XD DAF or MAN -cats II MAN ) is able to be to exchange data with the individual control devices in order to example, the configuration or query the fault memory or to send new settings.

The communication between the workshop test unit and the individual control units, which usually come from many different manufacturers, was standardized with the KWP2000. Communication is thereby off after a question -and-answer principle. The test device sends a request to the protocol specified by the control unit, which sends back a response. This answer may contain requested data or just an indication of whether the received request was successful.

The KWP2000 can be based on different bus systems ( layers 1 and 2 of the OSI model ). They often use the K-line to use. Newer concepts using more and more CAN ( ISO -TP on CAN, described in ISO 15765 ).

KWP2000 is increasingly being replaced by UDS.