Interpreters Document



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dps Interpreters

Disclaimer:
Not all vehicle protocols are setup to report these “global error code” conditions. In addition, not all 
SPS applications utilize these error codes for displaying corresponding error messages to the user. 
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1993-2011 General Motors Company, GM Customer Care & Aftersales. All Rights Reserved.
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200 
Procedure for Adding New Op-Codes or Exceptions to Existing Op-Codes 
When new devices are released for production, new Op-Codes and add exceptions to existing Op-Codes may 
be required. The Op-Codes and their functionality need to be included in the SPS software before being 
included in the interpreter instructions of a Utility File. To ensure the timing of changes, the Development 
Engineers from the controller‟s supplier will have to work closely with the Systems Engineers at GM Customer 
Care & Aftersales. A formal procedure has to be created, to ensure that the development process is structured 
and kept under control. The supplier must provide the GM Customer Care & Aftersales SE with a complete 
description of the Op-Codes exact functionality. The description must contain a byte-by byte breakdown of 
how to build the message as well as a byte-by byte description of all the possible responses (for an example 
see CD-1024). The detail of the request should be comparable to the Pseudo Code sections of the Op-Code 
descriptions. The GM Customer Care & Aftersales SE will review the request and decide whether a new Op-
Code or an exception to an existing Op-Code is required. 
After the Op-Codes/exceptions have been created, a new software package will be available for testing. The 
Op-Code updates will be documented and tested by the supplier and GM Customer Care & Aftersales 
personnel. Provided the new software works as specified the new interpreter will be released for production. 
Any changes or additions to the Op-Codes will result in updates to this document. In some cases a request for 
change may be generated by individuals outside of the ECU development area, for these cases the 
requirements are the same. The described interactions will be between the requesting group and GM 
Customer Care & Aftersales. 
Prior to release of any interpreter/documentation updates any affected groups that use an interpreter-based 
software must be notified. 

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