E/E Diagnostic Test Modes: Zero Emission Vehicle Propulsion Systems on UDS (ZEVonUDS)
J1979-3_202212
SAE J1979-3 describes the communication between the zero emissions propulsion systems and test equipment required by government regulations. Standardization regulations require passenger cars and light-, medium-, and heavy-duty trucks to support a minimum set of diagnostic information to external (off-board) “generic” test equipment.
To achieve this, SAE J1979-3 is based on the Open Systems Interconnection (OSI) Basic Refer to Model in accordance with ISO/IEC 7498-1 and ISO/IEC 10731, which structures communication systems into seven layers. When mapped on this model, the services specified are broken into:
Application (layer 7), specified in:
○
ISO 14229-1, ISO 14229-3 UDSonCAN, or ISO 14229-5 UDSonIP
○
SAE J1979-3 ZEVonUDS
Presentation layer (layer 6), specified in:
○
SAE J1930, SAE J1930DA
○
SAE J1979DA
○
SAE J2012, SAE J2012DA
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SAE J1939DA, SAE J1939-73
Session layer services (layer 5), specified in:
○
ISO 14229-2
Transport layer services (layer 4), specified in:
○
DoCAN: ISO 15765-2 Transport protocol and network layer services
○
ISO 15765-4 Requirements for emissions related systems
○
DoIP: ISO 13400-2 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 2: Transport protocol and network layer services
Network layer services (layer 3), specified in:
○
DoCAN: ISO 15765-2 Transport protocol and network layer services
○
ISO 15765-4 Requirements for emissions related systems
○
DoIP: ISO 13400-2 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 2: Transport protocol and network layer services
Data link layer (layer 2), specified in:
○
DoCAN: ISO 15765-4, ISO 11898-1, -2
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DoIP: ISO 13400-3 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 3: Wired vehicle interface based on IEEE 802.3
Physical layer (layer 1), specified in:
○
DoCAN: ISO 15765-4, ISO 11898-1, -2, in accordance with Table 1
○
DoIP: ISO 13400-3 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 3: Wired vehicle interface based on IEEE 802.3
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ISO 13400-4 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 4: Ethernet-based high-speed data link connector
○
SAE J1962 Diagnostic Connector
NOTE: SAE J1979-3 provides a standard to satisfy known country-specific certification regulations. SAE J1979-3 is not considered a final authority for interpretation of the certification regulations, so users of this document should determine the applicability of capabilities defined in this document for their specific OBD regulatory requirements
Rationale:
Due to regulatory adoption of OBDonUDS, SAE J1979 now becomes a multiple part document series:
1
SAE J1979, which defines diagnostic test modes for OBDonEDS used for emissions OBD.
2
SAE J1979-2, which defines the diagnostic services for OBDonUDS used for emissions OBD.
3
SAE J1979-3 (ZEVonUDS), which defines the diagnostic services for electric, fuel cell, and other zero emissions propulsion systems.
Market regulations specify which data links are allowed for sale in a given market.
Included in: On-Board Diagnostics for Light and Medium Duty Vehicles Subscription Learn More
Related Topics:
Greenhouse gas emissions
Low emission vehicles (LEV) and zero emission vehicles (ZEV)
Electronic control units
Electrical systems
Engine control systems
On-board diagnostics (OBD)
Identification numbers
Energy storage systems
Diagnostics
Electronic brake controls
Also known as: SAE J 1979-3
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