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



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gmw3110

CAN Id 
#1 
#2 
#3 
#4 
#5 
#6 
#7 
#8 
T(USDT-SF) 
$101 
$FE 
$02 
$A5 
$02 
--- 
--- 
--- 
--- 
N-1(USDT-
SF) 
$641 
$01 
$E5 
--- 
--- 
--- 
--- 
--- 

N-n(USDT-
SF) 
$64D 
$01 
$E5 
--- 
--- 
--- 
--- 
--- 
--- 
after all positive responses received: 
T(USDT-SF) 
$101 
$FE 
$02 
$A5 
$03 
--- 
--- 
--- 
--- 
No Response Allowed. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 190 of 336 
8.17.6 Node Interface Function. 
8.17.6.1 Node Interface Data Dictionary (Table 171). 
Table 171: Node Interface Data Dictionary of ProgrammingMode Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length 
programming_mode_active 
normal_message_transmission_status 
high_speed_mode_active 
programming_mode_entry_OK 
high_speed_mode_entry_OK
Reference Common/Global 
Pseudo Code Data 
Dictionary For Definition Of 
These Flags/Variables 
8.17.6.2 Node Interface Pseudo Code. 
Powerup States: 
/* see global data dictionary for variable states at powerup. */ 
Each time a ProgrammingMode ($A5) message is received, the following logic is executed: 
BEGINFUNCTION Serv_A5_Msg_Recvd() 
/* The TesterPresent_Timer_State is not checked in the pseudo code below because it must already be 
ACTIVE in order to have normal communications disabled (which is checked for in both level $01 and $02. 
Once normal communications have been disabled, the only methods to re-enable normal comm is to send a 
$20 request or let a P3
C
timeout occur. In either case, the flags programming_mode_entry_ok and 
high_speed_mode_entry_ok get reset. Therefore it is also not possible to have normal comm re-enabled 
between the verification request ($01 or $02) and the request to enable the programming event ($03) so no 
check is necessary for this in level $03. */ 
IF ((message_data_length != 2) THEN 
send Negative Response ($7F $A5 $12) /* InvalidFormat */ 
ELSE IF (programming_mode_active = YES) THEN 
send Negative Response ($7F $A5 $22) /* ConditionsNotCorrect */ 
ELSE 
SELECT FIRST 
WHEN ($Level = LEV_RQPM) /* ($01) Request Programming in low speed mode */ 
/* check if ok to enter programming mode and that $28 service is active */ 
/* $28 service disables setting DTCs and inhibits normal communication */ 
IF ( (device cannot enter programming mode) OR 
(normal_message_transmission_status = ENABLED)) THEN 
send Negative Response ($7F $A5 $22) /* Conditions Not Correct */ 
ELSE 
IF (device temporarily cannot enter programming mode) 
send Negative Response ($7F $A5 $78) /* RequestCorrectlyReceived-ResponsePending */ 
ENDIF 
programming_mode_entry_OK 

YES 
high_speed_mode_entry_OK 

NO 
send Positive Response ($E5) 
ENDIF 
WHEN ($Level = LEV_RQPM_HS) /* ($02) Request Programming in high speed mode */ 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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