SAE J1979-2_202104

E/E Diagnostic Test Modes: OBDonUDS

SAE International , 04/22/2021

Publisher: SAE

File Format: PDF

$81.00$162.00

Description

Standard By:SAE International , 04/22/2021

Published:04/22/2021

File Size:1 file , 1.4 MB

Language:English

Note:This product is unavailable in Ukraine, Russia, Belarus

SAE J1979-2 describes the communication between the vehicle's OBD systems and test equipment required by OBD regulations. On-Board Diagnostic (OBD) 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 J1979-2 is based on the Open Systems Interconnection (OSI) Basic Reference 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:

Diagnostic services (layer 7), specified in:
1. ○
  ISO 14229-1
2. ○
  SAE J1979-2 OBDonUDS
Presentation layer (layer 6), specified in:
1. ○
  SAE J1930, SAE J1930DA
2. ○
  SAE J1979DA
3. ○
  SAE J2012, SAE J2012DA
4. ○
  SAE J1939DA, SAE J1939-73
Session layer services (layer 5), specified in:
1. ○
  ISO 14229-2
Transport layer services (layer 4), specified in:
1. ○
  DoCAN: ISO 15765-2 Transport protocol and network layer services
2. ○
  ISO 15765-4
3. ○
  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:
1. ○
  DoCAN: ISO 15765-2 Transport protocol and network layer services
2. ○
  ISO 15765-4 Requirements for emissions related systems
3. ○
  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:
1. ○
  DoCAN: ISO 15765-4, ISO 11898-1, -2
2. ○
  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:
1. ○
  DoCAN: ISO 15765-4, ISO 11898-1, -2, in accordance with Table 1
2. ○
  DoIP: ISO 13400-3 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 3: Wired vehicle interface based on IEEE 802.3