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

Procedure 4: 
(Applicable if the ECU implements this return code).
 
1. Send a request for a valid dataIdentifier at a time when ECU internal conditions will not allow the data to 
be retrieved (e.g., EEPROM failure) and verify that the ECU sends the correct negative response ($22 
ConditionsNotCorrect). 
Procedure 5:
(Only applicable if ECU has DIDs that require the usage of a security code). 
Note:
Security code as defined in the Vehicle Theft Deterrent SSTS. 
1. Send a $1A message with a security code required $dataIdentifier value when the security code has not 
been sent, manufacturers enable counter = $00, and the vulnerability flag < $FF. Verify the negative 
response ($31 - Request Out Of Range) is sent. 
2. Send a $1A message with a security code required $dataIdentifier value when the manufacturers enable 
counter > $00 or vulnerability flag = $FF and the security code has not been sent. Verify the negative 
response ($31 - Request Out Of Range) is sent. 
3. Send a $1A message with a security code required $dataIdentifier value when the manufacturers enable 
counter > $00 or vulnerability flag = $FF and the security code has been sent. Verify the appropriate 
positive response is sent. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 98 of 336 
4. Repeats steps 1 thru 3 for each security code required $dataIdentifier value. 
8.4.8 Tester Implications. 
This service can result in responses which are single frame or multiple frame 
based on the DID requested. The tester should not functionally address requests for this service for a DID 
which results in multiple frame responses unless it can handle sending the flow control frames to each 
responding node within the allowable network timing parameters. 
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