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



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8.14.2 Request Message Definition. 
The length of the request message is dependant upon the size of the 
data referenced by the dataIdentifier parameter. Only one dataIdentifier which is supported by the ECU shall 
be included in the request message. See Table 146. 
Table 146: WriteDataByIdentifier Request Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
WriteDataByIdentifier Request Service Id 

3B 
SIDRQ 
#2 
dataIdentifier 

xx 
DID_ 
#3 

#n 
dataRecord[] = [
data#1 

data#m ] 



xx 

xx 
DREC_ 
DTA_1 

DTA_m 
8.14.2.1 Request Message Sub-Function Parameter $Level (LEV_) Definition. 
There are no sub-function 
parameters used by this service. 
8.14.2.2 Request Message Data Parameter Definition. 
Table 147 specifies the data parameter definitions for 
this service. 
Table 147: Request Data Parameter Definition 
Definition 
dataIdentifier 
The dataIdentifier (DID) is used within this service in the request message to indicate to the ECU application, 
which static data the tool is requesting to write. The dataIdentifier parameter in the response message is an 
echo of the one in the request message to confirm to the tool that the positive response is for the DID 
requested. 
If an ECU supports application specific DIDs (non-corporate standard), then the DID number, the data 
contents, and other information contained within the tables in Appendix C, must be documented within the 
ECU CTS or within a supplemental diagnostic specification referenced by the CTS. 
dataRecord[] 
This is the portion of the request message which contains the data which will be written to ECU memory. The 
length of this field is dependant upon the dataIdentifier requested. 
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