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



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8.7.7 Node Verification Procedure. 
Procedure 1: 
1. Request one valid memory address which is not restricted, and non-secured (MS = $0001). Verify the 
proper positive response. 
2. Request the maximum number of consecutive addresses allowed by the ECU (max value is the lesser of 
the NWL buffer size or 4094, minus the number of bytes in the memoryAddress parameter) starting at a 
memory address which will result in all addresses being valid, not restricted, and not secure. Verify the 
proper positive response. 
3. If applicable, send a request to an unlocked ECU for an address range that is completely valid, not 
restricted, and includes secure locations. Verify the proper positive response. 
Procedure 2: 
1. Send a request with less than the required number of data bytes (3 + the number of bytes in the 
memoryAddress parameter), verify negative response ($7F $23 $12). 
2. Send a request with more than the required number of data bytes (3 + the number of bytes in the 
memoryAddress parameter), verify negative response ($7F $23 $12). 
3. Send a request with a valid SA and a MS that results in an invalid ECU address. Verify negative response 
($7F $23 $31). 
4. Send a request with valid SA and MS = 0. Verify the negative response ($7F $23 $31). 
5. Send a request with a MS greater than the maximum MS supported by the ECU. Verify the negative 
response ($7F $23 $31). 
6. If applicable, send a request with a valid range of non secure addresses that includes at least one 
restricted address. Verify negative response ($7F $23 $31). 
CameraLoops.com


GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 124 of 336 
7. If applicable, send a request to an ECU with a manufacturers enable counter = $00 and a vulnerability flag 
< $FF, with a range of valid and non restricted addresses that includes at least one secure address. Verify 
negative response ($7F $23 $31). 
8. If applicable, send a request to an ECU with a manufacturers enable counter > $00 or vulnerability flag = 
$FF when security has not been accessed (SecurityAccess ($27) request has not been sent), with a range 
of valid and non restricted addresses that includes at least one secure address. Verify negative response 
($7F $23 $31). 
9. If applicable, send a request to an ECU with a manufacturers enable counter > $00 or vulnerability flag = 
$FF when security has been accessed (SecurityAccess ($27) request has been sent), with a range of valid 
and non restricted addresses that includes at least one secure address. Verify positive response. 
10. If negative response code $78 is supported by the ECU, then create the conditions under which the ECU 
should return the $7F $23 $78 response and verify that proper response is sent. Repeat for each possible 
reason an ECU would send the negative response with response code $78. 
11. If negative response code $22 is supported by the ECU, then create the conditions under which the ECU 
should return the $7F $23 $22 response and verify that proper response is sent. Repeat for each possible 
reason an ECU would send the negative response with response code $22. 

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