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



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 318 of 336 
Appendix E: DTC Status Byte and Failure Type Byte Definitions 
This Appendix contains the bit definition of the DTC status byte, and also the definition of the DTC Failure 
Type byte. A tester can retrieve this information (along with the base DTC number) from an ECU by requesting 
the $A9 service. 
E1 DTC Status Byte Bit Definitions 
Every node shall adhere to the convention for storing bit-packed DTC status information as defined in 
Table E1. Actual usage of the bit-fields may vary from node to node. The table breaks down the usage 
convention by the type of node. The categories are Emission related nodes, Safety related nodes, and other 
types of nodes which do not fall into either of the previous categories. 
Table E1: DTC Status Bit Assignments 
Bit 
Description 
Cvt 
(By Node Type) 
Mnemonic 
Emiss Safety 
Other 

warningIndicatorRequestedState 
This bit shall report the status of any warning indicators 
associated with a particular DTC. Warning outputs may consist of 
indicator lamp(s), displayed text information, etc. If no warning 
indicators exist for a given system or particular DTC, this bit shall 
be set to a value of 0. If the warning output is on for a given DTC, 
the history status flag shall also be true. 
1. Bit set to 1 = Warning indicator requested to be ON. 
2. Bit set to 0 = Warning indicator not requested to be ON. 
3. Bit will be set to a value of 0 on a successful code clear. 


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