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



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num_records 
This is a variable used in the pseudo code to indicate the maximum number of 
failure records that a node will store.
 
$00 thru $FF 
record_array 
For the purposes of the pseudo code, it is assumed that the failure record data 
is stored as an array of data structures. Each data structure contains the 
following elements: 
1. record_number_stored 
2. DTC_Number 
3. DTC_FailureType 
4. Data 
The data referenced in element 4 above is the first byte of DTC specific data 
stored in the failure record. 
To access an element of the data structure, the following nomenclature is used: 
record_array[record_index].element 
Where:
record_index is described above in the data dictionary and element is 
one of the four types listed here.
 
The values are described 
below for each data type of 
the record: 
1. $00 thru $255 (node 
specific) 
2. A 2-byte value is used to 
indicate the DTC set. 
Reference mode $A9 for 
more details on DTC 
format. 
3. A 1-byte value used to 
describe the FailureType 
of a stored DTC.
4. This field can be multiple 
bytes long and contain 
data which must be 
specified in a CTS or 
supplemental diagnostic 
specification. 
CameraLoops.com


GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 92 of 336 
Variable/Meaning 
Values 
Record_match_found 
This is a flag used in the pseudo code to keep track of whether a record exists 
which matches the one requested.
 
YES/NO 
DTC_Number 
This is a local variable that is set equal to the DTC Number from the request 
message. 
Matches the value from the 
request message 

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