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Request Message Definition



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WORLDWIDE ENGINEERING STANDARDS General Motors Local Ar

8.6.2 Request Message Definition. 
(Table 80)
Table 80: ReadDataByParameterIdentifier Request Message
Data Byte Parameter Name 
Note 1
Cvt Hex Value Mnemonic
#1
ReadDataByParameterIdentifier Request Service Id
M
22
SIDRQ
#2
#3
parameterIdentifier #1 = [
byte 1 (MSB)
byte 2 (LSB)]
M
00 thru FF
00 thru FF
PID_
B1
B2
#4
#5
parameterIdentifier #2 = [
byte 1 (MSB)
byte 2 (LSB)]
U
00 thru FF
00 thru FF
PID_
B1
B2
:
:
:
:
:
#n-1
#n
parameterIdentifier #k = [
byte 1 (MSB)
byte 2 (LSB)]
U
00 thru FF
00 thru FF
PID_
B1
B2
Note 1: 
MSB = Most Significant Byte, LSB = Least Significant Byte.
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
Page 108
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
8.6.2.1 Request Message Sub-Function Parameter $Level (LEV_) Definition. 
This service does not use a
sub-function parameter.


25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 108 of 336
8.6.2.2 Request Message Data Parameter Definition. 
Table 81 specifies the data parameter definitions for
this service.
Table 81: Data Parameter Definition
Definition
ParameterIdentifier # (1 - k)
This parameter identifies the ECU data that is being requested by the tester.
8.6.3 Positive Response Message Definition (Table 82).

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