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

Valid_CPID_Data_Length 
This is a flag which is used to keep track of whether or not the number of 
control bytes in the request message is valid.
 
YES/NO 
Valid_Msg_Length 
This is a flag used in the initial message length check which verifies that the 
request is a single frame and includes at least a CPID number.
 
YES/NO 
SecurityCodeAccess_CPID 
This is a flag which is used to keep track of whether or not the requested CPID 
is one which requires security code access.
 
YES / NO 
8.20.6.2 Node Interface Pseudo Code. 
Powerup States: 
Set all the individual device control status flags to FALSE 
The following logic is executed each time a Mode $AE message is received by the device: 
BEGINFUNCTION Serv_AE_Msg_Recvd() 
IF ((message_data_length > 7) OR (message_data_length < 2)) THEN 
send Negative Response ($7F $AE $12) /* Invalid Format.*/ 
Valid_Msg_Length 

NO 
ELSE
Valid_Msg_Length 

YES 
Valid_CPID 

NO 
Secure_CPID 

NO 
Valid_CPID_Data_Length 

NO 
FOR (CPID_Index 

$00 TO (Num_Supported_CPIDs - $01) BY $01) 
IF (CPID_Array[CPID_Index].CPID = $CPID) THEN 
Valid_CPID 

YES
IF (CPID_Array[CPID_Index].Security = YES) THEN 
Secure_CPID 

YES 
ENDIF 
IF (CPID_Array[CPID_Index].SecurityCodeAccess = YES) THEN 
SecurityCodeAccess_CPID 

YES 
ENDIF 
IF (CPID_Array[CPID_Index].Length=(message_data_length-$02)) THEN 
Valid_CPID_Data_Length 

YES 
ENDIF 
CPID_Index 

Num_Supported_CPIDs 
ENDIF 
ENDFOR 
ENDIF
IF (Valid_Msg_Length = YES) THEN 
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