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


GM WORLDWIDE ENGINEERING STANDARDS



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 250 of 336 
Note:
An ECU that was SPS_TYPE_C prior to being successfully programmed is required to be capable of 
reporting its diagnostic address once it is fully programmed and executing operational software. 

The programming tool shall be able to connect to the DLC with the vehicle in any power mode without 
causing damage to any ECU or components attached to the physical I/O pins of any ECU. 

The sequence of signals during connection to the DLC shall not cause any degradation in performance or 
damage to the ECU or components attached to the physical I/O pins of any ECU. 

All ECUs shall meet the frame padding requirements as outlined in paragraph 4.6 of this specification. 
9.3 Requirements for SPS Programmable ECUs to Support Programming. 
9.3.1 Hardware Requirements. 
All ECUs that are SPS programmable must be able to interface with the 
programming tools used by development, the assembly plant, and by service via the appropriate GMLAN pins 
of the vehicle 16-pin DLC specified in GM J1962. The only power required at the DLC for programming shall 
be vehicle battery power. 
Any ECU that is properly installed in the vehicle and is SPS programmable shall be able to be programmed via 
the DLC. It shall not be required to remove the ECU from the vehicle in order to perform programming. 
9.3.1.1 Memory Requirements. 
The ECU memory shall be permanently affixed (non-removable) to the circuit board. 
There are three different types of memory required that can be categorized into the following retention levels. 
Examples of memory that is typically used for each memory type is given in parenthesis. All voltage levels (V
p

are at the ECU connector and apply to the primary power pin. 
1. Type 

memory 
(typically 
RAM) 
contents 
shall 
be 
capable 
of 
being 
retained 
while

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