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 207 of 336 
ENDIF 
ENDFOR 
IF (dtc_found = FALSE) 
send Negative Response($7F $A9 $31) 
/************************************************************************************ 
* Handle Message $81 Request “readStatusOfDTCByStatusMask” 
*************************************************************************************/ 
WHEN ($Level= LEV_RSDTCBS) 
DTC_Index 

0 
Request_Status_Mask 

$DTCSM 
/* Enable Background Loop For Handling UUDT reporting of $A9 $81 DTC information */ 
Level_81_Active 

YES 
/* Call background loop to send first UUDT response as acknowledgment */ 
call Service_A9_Process_Level_81() 
/********************************************************************************** 
* Handle Message $82 Request “sendOnChangeDTCCount” 
* 1. Notice that setting the status mask to $00 terminates the send-on-change
* transmission of DTC count information.
* 2. Also notice that nodes shall always transmit a UUDT acknowledgment message in 
* response to a tester
’s service $A9 $82 request (even if the tester requests 
* the same status mask as the one that is currently being serviced). 
*************************************************************************************/ 
WHEN ($Level= LEV_SOCDTCC) /* $82 sendOnChangeDTCCount */ 
IF ($DTCSM != $00) THEN 
/*set send_on_change_count to -1 ($FFFF), to ensure a UUDT response to the request */ 
send_on_change_count 

-1 
TesterPresent_Timer_State 

ACTIVE 
stored_status_mask 

$DTCSM 
/* Enable Background loop for handling UUDT reporting of $A9 $82 DTC data */ 
DTC_send_on_change_flag 

1
/* Call background loop one time to send the first UUDT acknowledgement */ 
call Send_On_Change_DTC_Count() 
ELSE 
/* disable background send on change processing */ 
DTC_send_on_change_flag 

0 
/* Send UUDT positive response with a DTC count of $00 00 */ 
send ($82 $00 $00) 
ENDIF 
ENDSELECT 
ENDIF 
ENDFUNCTION 
This function handles the sending of UUDT response messages for service $A9 requests with the 
sub-parameter set to $81. The function shall be executed in a background loop at a rate which satisfies the 
UUDT timing requirements specified in the Service Description section of this diagnostic service. 
BEGINFUNCTION Service_A9_Process_Level_81( ) 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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