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Page 207 GM WORLDWIDE ENGINEERING STANDARDS



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WORLDWIDE ENGINEERING STANDARDS General Motors Local Ar

Page 207
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
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).
*************************************************************************************/


25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 207 of 336
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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