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

Table 12: SPS Special Case ECU CAN Identifier Assignment 
CAN Id Bit position 
10 
8 7 
0 
SPS_PrimeReq USDT request CAN Id 
$0 
ECU Diagnostic Address 
SPS_PrimeRsp USDT response CAN Id 
$3 
ECU Diagnostic Address 
The diagnostic address embedded in the special case SPS_PrimeReq and SPS_PrimeRsp diagnostic request 
and response CAN Identifiers shall be the physical node (ECU) address. See Appendix D for further details on 
ECU diagnostic addresses. 
An ECU which only comprehends the special case diagnostic CAN Identifiers shall only respond to diagnostic 
requests once the tester enables their use. Additional information about the SPS_PrimeReq and 
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SPS_PrimeRsp diagnostic CAN Identifiers and the process to enable them can be found in this specification in 
paragraph
 
9.1.1 - Enabling Diagnostic Responses on SPS_TYPE_C ECUs. The special case CAN Identifiers 
must be enabled by the tester after normal communications have been disabled in order to prevent potential 
CANId conflicts between normal communications messages and diagnostic messages using the special case 
CAN Identifiers. 
4.5 Message Addressing. 
Diagnostic messages may be addressed either physically (targeted to a single 
node) or functionally (addressed to one or multiple nodes). The type of message addressing used for 
diagnostic request messages is determined by the diagnostic CANId used. All diagnostic response messages 
will be physically addressed, using one of the reserved range of physical response CAN Identifiers (defined 
previously).