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

8.3.6.2 Node Interface Pseudo Code. 
Powerup States: 
None 
Each time a $12 message is received, the following logic is executed: 
BEGINFUNCTION Serv_12_Msg_Recvd() 
SELECT FIRST 
WHEN ($level=$01) /* readFailureRecordIdentifiers request message */ 
IF (message_data_length != 2) 
send Negative Response ($7F $12 $12) /* Invalid Format. */ 
ELSE IF (Device cannot provide Failure Records at this time) THEN 
Reject the request with a ($7F $12 $22) for conditions not correct 
ELSE IF (Processing this message will take more than P2
C
ms) THEN
Send ($7F $12 $78) /*for RequestCorrectlyReceived-ResponsePending */ 
….. 
Send ($52 $01 ….) /* positive response message */ 
ENDIF 
WHEN ($level=$02) /* readFailureRecordParameters request message */ 
IF (message_data_length != 6) 
send Negative Response ($7F $12 $12) /* Invalid Format. */ 
ELSE IF (Device cannot provide Failure Records at this time) THEN 
Reject the request with a ($7F $12 $22) for conditions not correct 
ELSE 
record_match_found 

NO 
DTC_Number 

((failureRecordIdentifier[DTCHighByte] << 8) |failureRecordIdentifier[DTCLowByte]) 
FOR (record_index 

0 TO (num_records - 1) BY 1) 
/* the DTC comparison below shall check for a match of both the MSB and the LSB */ 
IF ( (record_array[record_index].record_number_stored = 
failureRecordIdentifier[failureRecordNumber]) AND 
(record_array[record_index].DTC_Number = DTC_Number) AND 
(record_array[record_index].DTC_FailureType = 
failureRecordIdentifier[DTCFailureTypeByte]) ) 
record_match_found 

YES 
ENDIF 
ENDFOR 
IF (record_match_found = NO)
send Negative Response ($7F $12 $31) /* Request Out Of Range. */ 
ELSE IF (Processing this message will take more than P2
C
ms) THEN
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