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

8.3.2 Request Message Definition (Table 56). 
Table 56: ReadFailureRecordData Request Message 
Data Byte Parameter Name 
Cvt 
Hex Value Mnemonic 
#1 
ReadFailureRecordData Request Service Id 
M 
$12 
SIDRQ 
#2 
sub-function = [
readFailureRecordIdentifiers 
readFailureRecordParameters ] 
M 
$01 
$02 
LEV_ 
RFRI 
RFRP 
#3 
#4 
#5 
#6 
failureRecordIdentifier = [ 
failureRecordNumber 
DTCHighByte 
DTCLowByte 
DTCFailureTypeByte ] 
M
1 
Note 1
xx 
xx 
xx 
xx 
FRDTCIREC 
FRN 
DTCHB 
DTCLB 
DTCFT 
Note 1:
M
1
= Bytes 3 thru 6 are mandatory if the sub-function parameter is readFailureRecordParameters ($02). They are not included in 
the request message if the sub-function parameter is readFailureRecordIdentifiers ($01). 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
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February 2010 
Page 85 of 336 
8.3.2.1 Request Message Sub-Function Parameter $Level (LEV_) Definition. 
The following sub-function 
$levels (LEV_) of operation are defined for service $12 ReadFailureRecordData (Table 57): 
Table 57: Definition of Sub-function Values 
Hex 
Description 
Cvt 
$01 
readFailureRecordIdentifiers 
Allows a tester to read the failureRecordDataStructureIdentifier and the failure record 
identifiers. A failure record identifier is made up of a failure record number and a DTC 
identifier. 
Note:
This level is only used to obtain the failureRecordDataStructureIdentifier parameter 
and the failure record identifiers. The data bytes contained within a particular failure 
record are retrieved with the readFailureRecordParameters ($02) level of service.