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

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
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February 2010 
Page 335 of 336 
E1.3.8 DTC Failure Sub Type (Symptom) Definition of Bus Signal Failures. 
Table E11: DTC Failure Sub Type Definition for Failure Category 
“7” 
Failure 
Type 
Sub 
Type 
Bus Signal/Message Failures 
Note: 
This category includes faults related to bus hardware and signal integrity. This 
category is also used when the physical input for a signal is located in one ECU and 
another ECU diagnoses the circuit. 
Byte 
Nibble 
Sub Type 
(hex) 
(binary) 
Description 
Definition 
70 
0000 
reserved 
71 
0001 
invalid serial data received
This sub type is used by the ECU to indicate a signal 
was received with the corresponding validity bit equal to 
invalid
or post processing of the signal determines it is 
invalid. 
72 
0010 
alive 
counter 
incorrect/not 
updated 
This sub type is used by the ECU to indicate a signal 
was received without the corresponding rolling count 
value being properly updated. 
73 
0011 
parity error 
This sub type is used by the ECU to indicate a message 
was processed with an incorrect parity calculation. 
74 
0100 
value 
of 
signal 
protection 
calculation incorrect 
This sub type is used by the ECU to indicate a message 
was processed with an incorrect protection (checksum) 
calculation. 
75 
0101 
signal above allowable range 
This sub type is used for failures where some circuit 
quantity, reported via serial data, is above a specified 
range. 
76 
0110 
signal below allowable range 
This sub type is used for failures where some circuit 
quantity, reported via serial data, is below a specified 
range. 
77 
0111 
reserved 
78 
1000 
reserved 
79 
1001 
reserved 
7A 
1010 
reserved 
7B 
1011 
reserved 
7C 
1100 
reserved 
7D 
1101 
reserved 
7E 
1110 
reserved 
7F 
1111 
Erratic 
This sub type is used for failures where the signal, 
reported via serial data, is momentarily implausible or 
discontinuous. 
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