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


E1.3 DTC Failure Type Definition by Category



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E1.3 DTC Failure Type Definition by Category. 
The DTC Failure Type Byte Definitions in the tables below 
shall be used to provide additional fault information for all DTCs which do not meet one of the exceptions 
outlined in section E1.2.1. 
E1.3.1 DTC Failure Sub Type (Symptom) Definition of General Electrical Failures. 
Table E4: DTC Failure Sub Type Definition for Failure Category 
“0” 
Failure 
Type 
Sub 
Type 
General Electrical Failures 
This category includes standard wiring failure modes (i.e., shorts and opens), direct 
current (DC) quantities related by Ohm
’s Law and quantities related to amplitude, 
frequency or rate of change, and waveshape. 
Byte 
Nibble 
Sub Type 
(hex) 
(binary) 
Description 
Definition 
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Failure 
Type 
Sub 
Type 
General Electrical Failures 
This category includes standard wiring failure modes (i.e., shorts and opens), direct 
current (DC) quantities related by Ohm
’s Law and quantities related to amplitude, 
frequency or rate of change, and waveshape. 
Byte 
Nibble 
Sub Type 
(hex) 
(binary) 
Description 
Definition 
00 
0000 
no additional 
information (see 
E1.2.1) 
This sub type is used for failures that cannot be assigned to a 
specific sub type. See E1.2.1. 
01 
0001 
short to battery 
This sub type is used for failures where the ECU measures vehicle 
system (battery positive) potential for greater than a specified time 
period or when some other value is expected. 
02 
0010 
short to ground 
This sub type is used for failures where the ECU measures ground 
(battery negative) potential for greater than a specified time period or 
when some other value is expected. 
03 
0011 
voltage below 
threshold 
This sub type is used for failures where the ECU measures a voltage 
below a specified range but not necessarily a short to ground. 
04 
0100 
open circuit 
This sub type is used for failures where the ECU determines an open 
circuit via lack of bias voltage, low current flow, no change in state of 
an input in response to an output, etc. 
05 
0101 
short to battery or 
open 
This sub type is used for failures where the condition detected by the 
ECU is the same for either indicated failure mode. 
06 
0110 
short to ground or 
open 
This sub type is used for failures where the condition detected by the 
ECU is the same for either indicated failure mode. 
07 
0111 
voltage above 
threshold 
This sub type is used for failures where the ECU measures a voltage 
above a specified range but not necessarily a short to battery. 
08 
1000 
signal invalid 
This sub type is used for failures where the value of the signal is not 
plausible given the operating conditions. 
09 
1001 
rate of change 
above threshold 
This sub type is used for failures where the signal transitions more 
quickly than is reasonably allowed. 
0A 
1010 
rate of change 
below threshold 
This sub type is used for failures where the signal transitions more 
slowly than is reasonably allowed. 
0B 
1011 
current above 
threshold 
This sub type is used for failures where the ECU measures current 
flow above a specified range. 
0C 
1100 
current below 
threshold 
This sub type is used for failures where the ECU measures current 
flow below a specified range. 
0D 
1101 
resistance above 
threshold 
This sub type is used for failures where the ECU infers a circuit 
resistance above a specified range. 
0E 
1110 
resistance below 
threshold 
This sub type is used for failures where the ECU infers a circuit 
resistance below a specified range. 
0F 
1111 
erratic 
This sub type is used for failures where the signal is momentarily 
implausible (not long enough for signal invalid) or discontinuous. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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