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 82 of 336 
Send negative response ($7F $10 $12) /*for SubfunctionNotSupported-InvalidFormat */ 
valid_request 

NO 
ENDSELECT 
ENDIF 
IF (valid_request = YES) 
Send ($50) positive response message 
ENDIF 
ENDFUNCTION 
8.2.7 Node Verification Procedure. 
Procedure 1: 
1. Send a $10 message with an invalid $level parameter and verify the negative response ($7F $10 $12). 
2. Send a $10 message without a sub-parameter included and verify the negative response ($7F $10 $12). 
3. Send a $10 message with data bytes after the sub-parameter and verify the negative response ($7F $10 
$12). 
4. If negative response code $78 is supported by the ECU, then create the conditions under which the ECU 
should return the $7F $10 $78 response and verify that proper response is sent. 
5. Repeat the previous step of this procedure for each possible reason an ECU would send the negative 
response with response code $78. 
Procedure 2: 
(if sub-function $02 is supported).
 
1. Send a $10 message with the sub-function parameter set to $02 (disableAllDTCs). 
2. Create a failure which would set a DTC and verify that no DTC is set. 
3. Send TesterPresent messages for 2 minutes and then verify that no DTCs are set. 
4. Stop sending diagnostic messages for P3
Cmax 
ms (ensures a TesterPresent timeout to enable DTCs) and 
verify that the appropriate DTC is set (once all the criteria to set the DTC have been fulfilled). 
5. Repeat steps 1 through 3 of this procedure, and then send a $20 service request. Verify the appropriate 
response to the service $20 and then check that the appropriate DTC is set (once all the criteria to set the 
DTC have been fulfilled). 

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