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Table 146: WriteDataByIdentifier Request Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
WriteDataByIdentifier Request Service Id
M
3B
SIDRQ
#2
dataIdentifier
M
xx
DID_
#3
:
#n
dataRecord[] = [
data#1
:
data#m ]
M
:
U
xx
:
xx
DREC_
DTA_1
:
DTA_m
Definition.'>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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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
8.14.3 Positive Response Message Definition (Table 148).
Table 148: WriteDataByIdentifier Positive Response Message
Data Byte Parameter Name