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

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 115 of 336 
IF ((ReqPIDArray[ReqIndex] = PidStructArray[Index].PidNumber) AND 
((PidStructArray[Index].PidSecure = NO) OR 
(Security_Access_Unlocked = TRUE)) AND ((PidStructArray[Index].PidSecurityCode = NO) 
OR (Security_Access_Allowed = TRUE))) THEN 
attempt to obtain pid data 
IF (operating conditions did not allow PID data to be successfully retrieved) THEN 
Srv_22_NRC 

$22 
Index 

NumArrayElements /* to exit inner for loop */ 
ReqIndex 

Num_PIDs_Requested /*exit outer for loop */ 
ELSE 
copy PID number and data into response buffer 
Index 

NumArrayElements /* to exit for loop */ 
ENDIF 
ENDIF 
ENDFOR 
ENDFOR 
ELSE
Srv_22_NRC 

$31 
ENDIF 
ENDIF 
IF (Srv_22_NRC != $00) THEN 
IF ((message_address_type = PHYSICAL) OR (Srv_22_NRC != $31)) THEN 
send ($7F $22 $Srv_22_NRC) 
ENDIF 
ELSE IF (Process_Request = TRUE) THEN 
send ($62, PID#_MSB, PID#_LSB, data…….) 
ENDIF 
ENDFUNCTION 
8.6.7 Node Verification Procedure. 
Procedure 1: 
1. Send a physically addressed $22 message for one (unsecure) $PID that is supported by the ECU. Verify 
proper response, containing the data of the requested $PID (test data formatting). 
2. Send a physically addressed $22 message for a single $PID where that $PID is not supported by the ECU. 
Verify the negative response ($7F $22 $31 - Request Out Of Range). 
3. If applicable, send a physically addressed $22 message for one secure $PID (that is supported by the 
ECU) at a time when the ECU is secure. Verify the negative response ($7F $22 $31 - Request Out Of 
Range). 
4. If applicable, unlock the ECU via the security access service then repeat the request in the previous 
procedure and verify the appropriate positive response and data content. 
5. Send a physically addressed $22 request message for multiple $PIDs (if the ECU supports multiple PIDs 
in a single request), where at least one, but not all, of the requested $PIDs is supported by the ECU and 
does not require security access. Ensure that the number of PIDs in the request is less than or equal to the 
maximum number supported in a single request. Verify proper response, containing only the data of the 
requested $PID(s) which are supported by the ECU and do not require security access. 
6. Send a physically addressed $22 request message for multiple $PIDs (if the ECU supports multiple PIDs 
in a single request), where all of the requested $PIDs are supported by the ECU (and do not require 
security access). Ensure that the number of PIDs in the request is less than or equal to the maximum 
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