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ISO 27145-2 1st Edition, August 15, 2012 Road vehicles - Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-OBD) communication requirements - Part 2: Common data dictionary
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 27145 defines all regulatory data elements of
the ISO 27145 series. The data elements are used to provide the
external test equipment with the diagnostic status of the vehicle
on-board diagnostics (VOBD) system in the vehicle. All data
elements are communicated with the unified diagnostic services as
defined in ISO 27145-3. The data elements are diagnostic trouble
codes (DTCs), data identifiers (DIDs) and routine identifiers
(RIDs). The mapping from parameter identifiers (PIDs), monitor
identifiers (MIDs) and info type identifiers (ITIDs) is described
in this part of ISO 27145.
If new legislated WWH-OBD GTR modules are established, it is
intended that ISO 27145 be applicable with possible extensions,
which can be included in this part of ISO 27145, can be specified
as enhancements of the SAE Digital Annexes or can even be part of
other referenced documents which are intended to include the
applicable data definitions.
ISO 27145 is intended to become the single communication
standard for access to OBD-related information (VOBD). To allow for
a smooth migration from the existing communication standards to
this future world-wide communication standard, the communication
concept as specified in ISO 27145-4 is based on two different data
links: ISO 15765-4 and ISO 13400 (all parts).
In view of the usage of standard network layer protocols, future
extensions to optional physical layers (e.g. wireless) are
possible.
NOTE It is expected to extend ISO 27145-4 as necessary upon
introduction of additional communication media.
ISO 27145-4 is the entry point to establish communication with
the vehicle. Based on the results of the initialization, the
external test equipment determines which protocol and diagnostic
services are supported by the vehicle's emissions-related system,
i.e.
— legislated OBD: ISO 15031 series, and
—legislated WWH-OBD: ISO 27145.
Vehicles according to ISO 27145 provide VOBD system support as
envisioned for WWH-OBD by Global Technical Regulation (GTR) No.
5.
IMPORTANT — Use cases deriving from country-specific
implementation of GTR No. 5 into local legislation are not included
in this part of ISO 27145.