Uma comparação entre j1939 e iso 15031

Uma Comparação entre J1939 e ISO 15031

A Comparison of J1939 & ISO15031
Jeff Craig Vector CANtech, Inc.

Agenda
– Diagnostic Standards – Physical Interface – Connectors – Terminology – Protocol Overview – Fault Codes

History Lesson
• What is this??

• 1980’s Automotive Diagnostic Tool

Major Differences
J1939 (MD & HD Truck)
All standards defined in SAE J1939 parts 29 bit identifiers Used for normal communications & diagnostics Fault status broadcast regularly (e.g. DM1) Primary functionality defined using Diagnostic Messages (DMs) 3 byte fault codes + occurrence counter Four warning lamps defined 250 Kbps bus speed Nine pin diag connector standard (J1939‐13)

ISO 15031 (Pass Car & LD Vehicles)
ISO 15031 is harmonized with several SAE stds. 11 bit identifiers Used only for diagnostics No broadcast messages Primary functionality defined using unique communication Service IDs (SIDs) 3 byte fault codes One warning lamp defined 500 Kbps bus speed Sixteen pin diag connector standard (ISO15031‐3 /J1962)

Diagnostic Standards

Diagnostic Standards: Car/Truck – SAE/ISO
SAE J1930 ‐ terms & defns J1962 ‐ connector J1978 ‐ scan tool J1979 ‐ diag services J2012 ‐ fault codes J2186 ‐ link security J2534 ‐ pass thru J1699 ‐ OBD conformance J1939 (Multiple parts) J2403 ‐ terms & defns ISO ISO11898 (5 parts) ‐ CAN ISO15765 (4 parts) ‐ Diagnostics on CAN ISO15031 (7 parts) ‐ Legislated OBD on CAN

Pass Car & LD Veh

MD & HD Veh

N/A

In some cases multiple standards will be mixed on the same vehicle

Apples – to ‐ Apples
OSI Layer N/A 7 6 5 4 3 2 1 Diagnostic Connector Application Presentation Session Transport Protocol Network Layer Data Link Physical Layer SAE J1939‐21 SAE J1939‐31 SAE J1939‐21
(ISO 11898‐1)

MD & HD Standards & OBD Legislated SAE J1939‐13 SAE J1939‐71/73 SAE J1939‐81

Pass Car & LD OBD Legislated ISO 15031‐3 ISO 15031‐5
(SAE J1979)

ISO 15031‐5
(SAE J1979)

ISO 15765‐4 ISO 15765‐2 ISO 15765‐4 ISO