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

4.2 Diagnostic Service Table Overview. 
Table 6
 
gives a fundamental overview of the diagnostic services 
available and when each service is required to be implemented by an ECU. The table also indicates which 
message format (USDT or UUDT) shall be supported for the positive response message(s) for each service. 
The 
Diagnostics
column indicates which diagnostic services apply for all ECUs (programmable or 
non-programmable) in order to support vehicle assembly plant diagnostics, field service diagnostics, or ECU 
programming (even if a particular node is not programmable). For programmable ECUs, this column is applied 
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when the ECU is in a fully programmed state. An 
M
in this column indicates that the service is mandatory and 
shall be implemented by all ECUs as previously defined. A 
C
in this column indicates that the need for a given 
service (including specific applicable sub-functions) is to be agreed upon by the Design Release Engineer 
(DRE), the appropriate service representative(s), and the appropriate manufacturing representative(s). A 
U
in 
this column indicates that the DRE can decide whether or not to implement the service in an ECU. A 
N/A
in 
this column indicates that this service is only required for programming and the need to support the service 
shall be based upon the contents of the SPS column. 
The 
Programming (SPS) and Boot Memory
column applies to ECUs which are programmable via the SPS 
system. An 
M
in this column means that all ECUs which are programmable via the SPS system shall 
implement the service and that the service shall be available even if the ECU only contains boot software. A 
C 
in this column indicates that a service may be required for programming based on how the ECU supplier has 
developed their utility file. If the diagnostic service is used in the utility file, then it shall be supported in boot 
software. An