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

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
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February 2010 
Page 173 of 336 
8.14.5.2 WriteDataByIdentifier(dataIdentifier). 
(Table 151)
 
Table 151: WriteDataByIdentifier(dataIdentifier=VIN) 
T = Frame Sent By Tester, N = Frame Sent By Node; shaded region indicates PCI 
Frame Type 
CAN Id 
#1 
#2 
#3 
#4 
#5 
#6 
#7 
#8 
T(USDT-FF) 
$241 
$10 
$13 
$3B 
$90 
"W" 
"0" 
"L" 
"0" 
N(USDT-FC) 
$641 
$30 
$00 
$00 
--- 
--- 
--- 
--- 
--- 
T(USDT-CF) 
$241 
$21 
"J" 
"B" 
"F" 
"3" 
"5" 
"W" 
"1" 
T(USDT-CF) 
$241 
$22 
"0" 
"4" 
"2" 
"7" 
"6" 
"5" 
--- 
N(USDT-SF) 
$641 
$02 
$7B 
$90 
--- 
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8.14.6 Node Interface Function. 
8.14.6.1 Node Interface Data Dictionary (Table 152). 
Table 152: Node Interface Data Dictionary of WriteDataByIdentifier Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length 
Security_Access_Unlocked 
Security_Access_Allowed
Reference Common/Global 
Pseudo Code Data 
Dictionary For Definition Of 
These Flags/Variables 
8.14.6.2 Node Interface Pseudo Code. 
Powerup States: 
None 
Each time a $3B message is received, the following logic is executed: 
BEGINFUNCTION Serv_3B_Msg_Recvd() 
IF ($dataIdentifier is NOT supported) 
send Negative Response ($7F $3B $31) /* RequestOutOfRange */ 
ELSE IF (((message_data_length - 2)!= the expected length for $dataIdentifier) OR (message_data_length < 
3)) THEN 
send Negative Response ($7F $3B $12) /* Invalid Format */ 
ELSE IF ((any Data value in dataRecord[] is invalid for $dataIdentifier) OR
(($dataIdentifier requires security access) AND
(Security_Access_Unlocked = FALSE)) OR (($dataIdentifier requires security code access) AND 
(Security_Access_Allowed = FALSE))) THEN 
send Negative Response ($7F $3B $31) /* RequestOutOfRange */ 
ELSE IF (Conditions are not correct for writing to $dataIdentifier) THEN 
send Negative Response ($7F $3B $22) /* ConditionsNotCorrect */ 
ELSE 
IF (writing to $dataIdentifier will take more than P2
C
ms) THEN 
send Negative Response ($7F $3B $78) /* RequestCorrectlyReceived-ResponsePending */ 
ENDIF
Write data values from dataRecord[] to the memory address associated with the $dataIdentifier
send ($7B $dataIdentifier) positive response message 
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