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

8.18.6.2 Node Interface Pseudo Code. 
Powerup States: 
DTC_send_on_change_flag 

0 
Level_81_Active 

NO 
Each time a $A9 message is received, the following logic is executed: 
BEGINFUNCTION Serv_A9_Msg_Recvd() 
/************************************************************************************ 
* Verify that a valid sub-function is being requested and that the message length is
* valid 
*************************************************************************************/ 
IF (($Level not locally supported) OR 
(($Level = $LEV_RSDTCBN) AND (message_data_length != $05)) OR /* $Level = $80 */ 
((message_data_length != $03) AND /* $Level = $82 or $81 and length not 3 */ 
(($Level = $LEV_ SOCDTCC) OR ($Level = $LEV_RSDTCBS)))) THEN 
send Negative Response($7F $A9 $12) 
ELSE 
IF ((Node cannot service DTC request because read/write memory conflict) OR 
(Tester
’s request takes longer than P2
C
ms to process)) THEN 
send Negative Response($7F $A9 $78) 
ENDIF 
SELECT FIRST 
/************************************************************************************ 
* Handle Message $80 Request “readStatusOfDtcByDtcNumber” 
*************************************************************************************/ 
WHEN ($Level= $LEV_RSDTCBN) 
dtc_found = FALSE 
FOR (m 

0 TO (total_num_local_dtcs - 1) BY 1)
IF ((DTC_Info[m].DTCH = $DTCH) AND (DTC_Info[m].DTCL = $DTCL) AND
(DTC_Info[m].DTCFT = $DTCFT)) THEN 
dtc_found 

TRUE 
/* send UUDT positive response */ 
send ($80 $DTC_Info[m].DTCH $DTC_Info[m].DTCL
$DTC_Info[m].DTCFT $DTC_Info[m].DTCSB) 
m 

total_num_local_dtcs /* exit FOR loop */ 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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