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 327 of 336 
The DTC Failure Category is decoded in the High Nibble of the 
DTC Failure Type Byte
and the Failure Sub 
Type is decoded in the Low Nibble of the 
DTC Failure Type Byte.
Refer to Table E2. 
Table E3 provides the DTC Failure Type Byte category definitions. 
Table E2: DTC Failure Type Byte Definition 
DTC Failure Type Byte Definition 
High Nibble ($0x thru $Fx) 
Low Nibble ($x0 thru $xF) 
DTC Failure Category 
DTC Failure Sub Type 
Table E3: DTC Failure Category Definition 
DTC Failure Type Byte Category Definitions 
High Nibble (0000b thru 1111b) 
Category # Category Description 
0000 

General Electrical Failures 
0001 

Additional General Electrical Failures 
0010 

FM/PWM (Frequency/Pulse Width Modulated) Failures 
0011 

ECU Internal Failures 
0100 

ECU Programming Failures 
0101 

Algorithm Based Failures 
0110 

Mechanical Failures 
0111 

Bus Signal/Message Failures
1000 thru 1110 
8 thru E 
Reserved By Document 
1111 

Unique System Specific (assignments made by service 
operations and coordinated with manufacturing dept.) 
E1.2.1 Definition and Appropriate Uses Of DTC Failure Type Value $00. 
The DTC Failure Type value zero 
($00) is used to indicate that no additional information is available beyond that provided by the description for 
the DTC two (2) byte base code. Although the value of zero ($00) falls into the General Electrical Failures 
category, it can also be used for other types of DTCs as long as no other fault type values exist that would 
provide additional information. 
In cases where legislative requirements do not allow the reporting of DTCs with a fault type byte (e.g., 
emissions related DTCs), the ECU may choose to report its DTCs via enhanced diagnostic services with the 
fault type byte coded to zero ($00). This approach allows the same DTC tables to be used for reporting DTCs 
with both legislated and enhanced diagnostic services. 

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