Scope
This document specifies data link independent requirements of diagnostic communication services, which allow a diagnostic tester (client) to control diagnostic functions in an in-vehicle electronic control unit (ECU, server) such as an electronic fuel injection, automatic gearbox, anti-lock braking system, etc. connected to a serial data link embedded in a road vehicle.
It specifies diagnostic communication 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. This document does not restrict an in-vehicle on-board tester (client) implementation in an ECU/server in order to utilize the diagnostic communication services on the vehicle's communication data link to perform bidirectional diagnostic data exchange.This document does not specify any implementation requirements.
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