Civil Engineering Reference
In-Depth Information
information package may be the diagnostic servicing of the vehicle or system in
a workshop environment.
Part 2: Common emission-related data dictionary defines all regulatory emission-
related data elements of ISO/PAS 27145. A new part may be added in the future
upon availability of new legislated WWH-OBD GTR modules. The data elements
are used to provide the external test equipment with the diagnostic status of the
emission-related system in the vehicle. All data elements are communicated with
the UDSs as defined in ISO/PAS 27145-3 common message dictionary. Data ele-
ments are DTCs, PIDs, MIDs, TIDs/routine identifiers (RIDs) and ITIDs.
Part 2 defines three (3) different sets of data elements:
• A legacy (backward compatible) data set as defined in SAE J1939-71/-73 and
ISO 15031-5/SAE J1979, ISO 15031-6/SAE J2012.
• A unified data set (new data definition according to ISO/PAS 27145-2).
• A manufacturer data set (defined by manufacturer).
Part 3: Common message dictionary definition of ISO/PAS 27145 specifies the
implementation of a subset of UDSs as specified in ISO 14229-1. The diagnostic
services are used to communicate all diagnostic data as defined in “ISO/PAS 27145-
2 Common emissions-related data dictionary”.
The subset of UDSs derives from the requirements stated in the WWH-OBD
GTR. The common message set defined in this part is independent of the underlying
transport, network, data link and physical layer. This document does not specify any
requirements for the in-vehicle network architecture.
Part 3 includes a superset of a modified version of ISO 14229-1. Several sig-
nificant modifications are included in this part in order to support the data set of
SAE J1939, ISO 15031-5/SAE J1979 and ISO 15031-6/SAE J2012.
Part 4: Connection between vehicle and test equipment of ISO/PAS 27145 de-
fines the requirements to successfully establish, maintain and terminate communi-
cation with a vehicle that implements the requirements of the WWH-OBD GTR.
This requires plug and play communication capabilities of the vehicle as well as any
test equipment that intends to establish communication with a vehicle. This docu-
ment details all the OSI layer requirements to achieve this goal.
An ISO Publicly Available Specification (PAS) requires a worldwide ballot after
3 years of publication. The outcome of the ballot was to convert and establish ISO
27145 as an international standard with the addition of a Part 5 conformance test
and Part 6 external test equipment.
Figure
4.25
illustrates all referenced documents according to the OSI layers.
Two protocols are supported:
• ISO 15765 DoCAN (diagnostic communication over CAN).
• ISO 13400 DoIP (diagnostic communication over Internet protocol).
ISO 27145-1 defines the general structure of the documents and the WWH-OBD
applicable use cases as specified in the PAS.
