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


Table 10: OBD/EOBD 11-Bit USDT CAN Identifier Assignments



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Table 10: OBD/EOBD 11-Bit USDT CAN Identifier Assignments 
CAN Identifier 
Description 
$7DF 
CAN Identifier for functionally addressed request messages sent by the external test 
equipment. 
$7E0 
Physical request CAN Identifier from the external test equipment to OBD ECU #1 
$7E8 
Physical response CAN Identifier from OBD ECU #1 to the external test equipment 
$7E1 
Physical request CAN Identifier from the external test equipment to OBD ECU #2 
$7E9 
Physical response CAN Identifier from OBD ECU #2 to the external test equipment 
$7E2 
Physical request CAN Identifier from the external test equipment to OBD ECU #3 
$7EA 
Physical response CAN Identifier from OBD ECU #3 to the external test equipment 
$7E3 
Physical request CAN Identifier from the external test equipment to OBD ECU #4 
$7EB 
Physical response CAN Identifier from OBD ECU #4 to the external test equipment 
$7E4 
Physical request CAN Identifier from the external test equipment to OBD ECU #5 
$7EC 
Physical response CAN Identifier from OBD ECU #5 to the external test equipment 
$7E5 
Physical request CAN Identifier from the external test equipment to OBD ECU #6 
$7ED 
Physical response CAN Identifier from OBD ECU #6 to the external test equipment 
$7E6 
Physical request CAN Identifier from the external test equipment to OBD ECU #7 
$7EE 
Physical response CAN Identifier from OBD ECU #7 to the external test equipment 
$7E7 
Physical request CAN Identifier from the external test equipment to OBD ECU #8 
$7EF 
Physical response CAN Identifier from OBD ECU #8 to the external test equipment 
GMLAN emission related components that need to utilize the hardware filtering capabilities provided with CAN 
controllers may run into a situation where the number of messages that need to be filtered cannot be handled 
with the number of message objects available in the CAN controller. In such circumstances, an emission 
related ECU may choose to use the OBD/EOBD diagnostic CAN Identifiers to also support enhanced 
diagnostics. This is only valid for ECUs that support OBD/EOBD diagnostics with the 11-bit header format. 
Emission related ECUs utilizing the OBD/EOBD CAN Identifiers for enhanced diagnostics shall assign the 
enhanced diagnostic CAN Identifiers per Table 11. The range of CAN Identifiers from $5E8 thru $5EF on the 
high speed bus has been reserved in order to maintain the relationship between the USDT response CANId 
and the UUDT response CANId as outlined in paragraph 4.4.4. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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