General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

R/W 
Data Type 
Len 
$9A 
DiagnosticDataIdentifier (DDI) 
R/W* 
USN 
2 
This DID contains the DiagnosticDataIdentifier which identifies a supplier and system specific diagnostic 
data stream and shall be used by diagnostic testers to interpret a diagnostic data stream. The data 
format of the DDI is defined as two bytes, where the most significant byte of the DDI identifies the 
system by a system code and the least significant byte identifies the system data stream version 
number.
System Code (DDI high byte) shall be used to distinguish between the following cases: 

Different ECU systems, where the ECU uses the same Diagnostic Address (see DID $B0 Table for 
definition). 

Different system suppliers of the same component. 

Non-compatible ECU hardware and/or non-compatible software. 
Diagnostic Data Stream Version Number (DDI low byte) shall be incremented when: 

The diagnostic implementation is changed and the changes affect Service/Aftersales and/or 
Manufacturing diagnostic test tools. 
For an SPS_TYPE_B or SPS_TYPE_C ECU, the value of the least significant byte of the DDI shall 
always be $00 (provided that the DID is supported in a node which is not completely programmed). 
Position 
1 
2 
Description 
DDI 
02 
03 System Code, e.g., $02 = Simtec MS56.5 
Hex Value 
02 
03 Diagnostic Data Stream Version Code, e.g., $03 = version 03 
Table C7: Definition of XML Configuration Compatibility Identifier dataIdentifier 
DID Description 
R/W 
Data Type 
Len 
$9B 
XmlConfigurationCompatibilityIdentifier (XMLCCID) 
R 
USN 
2 
This DID contains the XmlConfigurationCompatibilityIdentifier. This DID shall be supported if an ECU 
performs option configuration via a released XML file. The tool must read this DID and ensure that the 
data read matches the value of the XMLCCID embedded in the XML file before performing any DID 
writes dictated by the XML configuration file. This ensures that the configuration data within the XML file 
is compatible with the software/hardware within the ECU. 
Position 
1 
2 
Description 
XMLCCID 
44166 
Hex Value 
AC 
86 
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