1 Scope
This document defines the requirements for the external test equipment as:
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— a means of establishing communications between a WWH-OBD-equipped vehicle and external
test equipment;
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— a set of diagnostic services, including addressing methods, to be provided by the
external test equipment in order to exercise the services defined in ISO 27145‑3.
This document describes the minimum capabilities or functions in the external test
equipment. Additional functionalities, for example, non WWH-OBD protocols or retrieval
of repair and maintenance information, can be integrated into the external test equipment
according to the test equipment manufacturer needs. The external test equipment designer
ensures that no such capability or function can adversely affect either a WWH-OBD-equipped
vehicle connected to the equipment, or the equipment itself.
When the external test equipment implements functionality, which is not covered by
ISO 27145‑3, this functionality is not linked to the timing requirements defined in this document.