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GMW3110 2010.pdf


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WORLDWIDE
ENGINEERING
STANDARDS

General Specification
Electrical Function

GMW3110

General Motors Local Area Network Enhanced Diagnostic Test Mode
Specification
1 Introduction.......................................................... 7

4.3.2 Node (ECU) Rules. .............................. 21

1.1 ....................................................................... 7

4.3.3 Special Considerations for Nodes
Operating as an On-board Test Device. ....... 21

1.2 Mission/Theme. ............................................ 7
1.3 Classification.. .............................................. 7
2 References .......................................................... 7

4.3.4 Special Considerations for Nodes
Operating On Multiple GMLAN Subnets. ..... 21

2.1 External Standards/Specifications. ............... 7

4.4 Message Identification - Diagnostic CAN
Identifiers (CAN Identifiers). ............................. 22

2.2 GM Standards/Specifications. ...................... 8

4.4.1 Diagnostic CANId Definitions. ............. 22

2.3 Additional References. ................................. 8

4.4.2 CAN Identifier Memory Map Model. .... 23

2.3.1 GMLAN Specific Publications. ............... 8

4.4.3 CAN Identifier Table. ........................... 24

2.3.2 Other Publications.................................. 9

4.4.4 Rules For CAN Identifier Assignment.. 25

3 Diagnostic Service Documentation Structure And
Convention ............................................................. 9

4.4.5 SPS Special Case ECU Programming
CANId Assignments. .................................... 27

3.1 Request Message Sub-Function Parameter
($Level) Definition. ............................................ 10

4.5 Message Addressing. ................................. 28

3.2 Request Message Data Parameter
Definition. .......................................................... 10
3.3 Positive Response Message Data Parameter
Definition.. ......................................................... 10
3.4 (Test Mode) Service Identifier (SID)
Overview.. ......................................................... 10
3.5 Request and Positive Response Message
Table Structure.. ............................................... 11
3.6 Node Interface Function Symbol, Pseudo
Code, and Data Dictionary Definition. .............. 12
3.6.1 Symbol Definition.. ............................... 12
3.6.2 Pseudo Code Definition.. ..................... 13
3.6.3 Common/Global Pseudo Code Data
Dictionary.. .................................................... 14
4 Diagnostic Strategy, Service Overview, and
Implementation Rules and Requirements ............ 17
4.1 Diagnostic Message Strategy - USDT and
UUDT Messages. ............................................. 17

4.5.1 Frame Data Byte Definition Based On
Address Method. .......................................... 28
4.6 ECU Frame Padding Requirements. ......... 32
4.7 Communication Layer Interaction. ............. 32
4.7.1
GMLAN
Communication
Layer
Interaction. .................................................... 33
4.8 Network Layer Buffer Requirements. ......... 34
4.8.1 Buffer Requirements for Normal
Operation and Diagnostics. .......................... 34
4.8.2 Buffer Requirements During SPS
Programming. ............................................... 35
4.9 Diagnostic Message Sequence Examples. 35
4.9.1
General
USDT
and
UUDT
Request/Response Sequence Examples. .... 35
4.9.2 Interleaving Single Frame and MultiFrame Diagnostic Messages. ....................... 37
4.10 Functional System Assignments. ............. 38
4.10.1 Definition of a Functional System. ..... 38

4.2 Diagnostic Service Table Overview. ........... 17

4.10.2 Functional System Table.. ................. 39

4.3 Diagnostic Communication Implementation
Rules. ................................................................ 19

5 Diagnostics and Node Management................. 39

4.3.1 Tester Rules. ........................................ 19

5.1 Interaction between Diagnostics and Node
Management. ................................................... 39

© Copyright 2010 General Motors All Rights Reserved

February 2010

Originating Department: North American Engineering Standards

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