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


Table 54: InitiateDiagnosticOperation(wakeUpLinks)



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Table 54: InitiateDiagnosticOperation(wakeUpLinks) 
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-SF) 
$101 
$FD 
$02 
$10 
$04 
--- 
--- 
--- 
--- 
N(USDT-SF) 
$641 
$01 
$50 
--- 
--- 
--- 
--- 
--- 
--- 
N(USDT-SF) 
$64A 
$01 
$50 
--- 
--- 
--- 
--- 
--- 
--- 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 81 of 336 
8.2.6 Node Interface Function. 
8.2.6.1 Node Interface Data Dictionary (Table 55). 
Table 55: Node Interface Data Dictionary of InitiateDiagnosticOperation Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length 
TesterPresent_Timer_State 
Diag_Services_Disable_DTCs 
DTCs_Enabled_In_Device_Control
Reference Common/Global 
Pseudo Code Data Dictionary 
For Definition Of These 
Flags/Variables 
valid_request 
This flag is locally used within this service to determine if a positive response 
is needed and whether to activate the TesterPresent_Timer_State
 
YES/NO 
8.2.6.2 Node Interface Pseudo Code. 
Powerup States: 
Each time a $10 message is received, the following logic is executed: 
BEGINFUNCTION Serv_10_Msg_Recvd() 
IF (message_data_length != 2) THEN 
Send Negative Response ($7F $10 $12) /*SubfunctionNotSupported-InvalidFormat */ 
valid_request 

NO 
ELSE 
valid_request 

YES 
SELECT FIRST 
WHEN ($Level= LEV_DADTC ) /* $02 Disable All DTCs */ 
TesterPresent_Timer_State 

ACTIVE 
Diag_Services_Disable_DTCs 

TRUE 
WHEN ($Level = LEV_EDDDC) /* $03 allow DTCs to run during device control */ 
/* verify that device control is not already active and that no other service has disabled DTCs before 
setting the flag to allow them to continue to run during device control */ 
IF (Diag_Services_Disable_DTCs = TRUE) THEN 
Send negative response ($7F $10 $22) /*ConditionsNotCorrectOrRequestSequenceError */ 
valid_request 

NO 
ELSE 
TesterPresent_Timer_State 

ACTIVE 
DTCs_Enabled_In_Device_Control 

YES 
ENDIF 
WHEN ($Level= LEV_WUPLNK ) /* $04 wake-up all links */ 
IF (more than P2
C
is needed to process this request) THEN 
send Negative Response ($7F $10 $78) /* request correctly received - response pending */ 
ENDIF 
generate wake-up on all GMLAN links where wake-up mechanism is supported 
if the wake-up mechanism implemented requires the gateway to continuously provide a hardwired 
signal to keep the ECUs awake then the ECU shall set any necessary flags to ensure that the wake-up 
remains active as long as the diagnostic VN is active 
OTHERWISE 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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