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


GM WORLDWIDE ENGINEERING STANDARDS



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 200 of 336 
Table 180: ReadDiagnosticInformation(sendOnChangeDTCCount) UUDT Positive Response Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
MessageNumber = [ sendOnChangeDTCCount ] 

82 
SOCDTCC 
#2 
#3 
DTCCountRecord = [
DTCCountHighByte 
DTCCountLowByte ] 

xx 
xx 
DTCCREC_ 
DTCCH 
DTCCL 
8.18.3.5 Positive Response Message Data Parameter Definition. 
Table 181 specifies the response 
message data parameter definitions for this service. 
Table 181: Request Data Parameter Definition 
Definition 
MessageNumber 
This data byte of the UUDT response message contains the sub-function parameter of the request message. 
DTCHighByte, DTCLowByte, DTCFailureTypeByte 
DTCHighByte, DTCLowByte and DTCFailureTypeByte together represent a unique identification number for a 
specific diagnostic trouble code supported by a device. The DTCHighByte and DTCLowByte represent a circuit 
or system that is being diagnosed. The DTCFailureTypeByte represents the type of fault in the circuit or 
system (e.g., sensor open circuit, sensor shorted to ground, algorithm based failure, etc). Definition of the 
DTCFailureTypeByte can be found in Appendix E of this specification. 
DTCStatusByte 
The status of a particular DTC. (e.g., DTC failed since power up, passed since power up, etc.) The definition of 
the bits contained in the DTCStatusByte can be found in Appendix E of this specification. 
DTCStatusAvailabilityMask 
A byte whose bits are defined the same as DTCStatusByte and represents the status bits that are supported 
by the device. 

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