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



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Request
UUDT
100
P2
CE
0
ECU Transmit
Tester Transmit
ECU NWL
Tester NWL
req
con
ind
req
con
ind
UUDT
req
con
ind
UUDT
req
con
ind
UUDT
req
con
ind
100
P2
CE
0
100
P2
CE
0
100
P2
CE
0
endOfDTCReport
message
general
P2CE timing
UUDT timing
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 197 of 336 
disabled while a DTC clear request is being processed. The algorithm shall be re-enabled after the DTC clear 
event has completed. The DTC clear does not modify the count value calculated on the previous execution of 
the algorithm so there is a good chance that a response message will be sent with the new count after the 
DTC clear has completed.
8.18.2 Request Message Definition. 
8.18.2.1 Request Message Definition - $Level $80 (readStatusOfDTCByDTCNumber) (Table 172). 
Table 172: ReadDiagnosticInformation(ReadStatusOfDTCByDTCNumber) Request Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
ReadDiagnosticInformation Request Service Id 

A9 
SIDRQ 
#2 
sub-function = [
readStatusOfDTCByDTCNumber ] 

80 
LEV_ 
RSDTCBN 
#3 
#4 
#5 
DTCMaskRecord = [
DTCHighByte
DTCLowByte 
DTCFailureTypeByte ] 

xx 
xx 
xx 
DTCMREC_ 
DTCH 
DTCL 
DTCFT 
8.18.2.2 Request Message Definition - $Level $81 (readStatusOfDTCByStatusMask) (Table 173). 
Table 173: ReadDiagnosticInformation(readStatusOfDTCByStatusMask) Request Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
ReadDiagnosticInformation Request Service Id 

A9 
SIDRQ 
#2 
sub-function = [
readStatusOfDTCByStatusMask ] 

81 
LEV_ 
RSDTCBS 
#3 
DTCMaskRecord = [
DTCStatusMask ] 

xx 
DTCMREC_ 
DTCSM 
8.18.2.3 Request Message Definition - $Level $82 (sendOnChangeDTCCount) (Table 174). 
Table 174: ReadDiagnosticInformation(sendOnChangeDTCCount) Request Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
ReadDiagnosticInformation Request Service Id 

A9 
SIDRQ 
#2 
sub-function = [
sendOnChangeDTCCount ] 

82 
LEV_ 
SOCDTCC 
#3 
DTCMaskRecord = [
DTCStatusMask ] 

xx 
DTCMREC_ 
DTCSM 
8.18.2.4 Request Message Sub-Function Parameter $Level (LEV_) Definition. 
The following definitions 
apply to the sub-function levels of operation for service $A9 ReadDiagnosticInformation. All other sub-function 
values are reserved for future definition within this specification. Future enhancements to this service, which 
require UUDT responses, shall have sub-function parameter levels within the range from $80 thru $8F as this 
range of UUDT responses are reserved for this service. See Table 175. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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