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This document specifies data link independent requirements of diagnostic services, which allow a diagnostic tester client to control diagnostic functions in an on-vehicle electronic control unit ECU, server such as an electronic fuel injection, automatic gearbox, anti-lock braking system, etc.
It specifies generic services, which allow the diagnostic tester client to stop or to resume non-diagnostic message transmission on the data link.
This document does not apply to non-diagnostic message transmission on the vehicle's communication data link between two electronic control units. However, this document does not restrict an in-vehicle on-board tester client implementation in an ECU in order to utilize the diagnostic services on the vehicle's communication data link to perform bidirectional diagnostic data exchange.
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Unified Diagnostic Services
The ECUs in modern vehicles control nearly all functions, including electronic fuel injection EFI , engine control , the transmission, anti-lock braking system, door locks, braking, window operation, and more. The Service ID SID and the parameters associated with the services are contained in the 8 data bytes of a message frame. Modern vehicles have a diagnostic interface for off-board diagnostics, which makes it possible to connect a computer client or diagnostics tool, which is referred to as tester, to the communication system of the vehicle. Thus, UDS requests can be sent to the controllers which must provide a response this may be positive or negative. This makes it possible to interrogate the fault memory of the individual control units, to update them with a new firmware, have low-level interaction with their hardware e. In addition, there are reserved session identifiers that can be defined for vehicle manufacturers and vehicle suppliers specific use.