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 191 of 336 
/* This level shall be supported by all ECUs on the low speed link */ 
/* This level shall not be supported by ECUs on the two wire links and 
shall result in a negative response $7F $A5 $12 if sent */ 
/*check if high speed programming mode is ok and $28 service is active*/ 
/*$28 service disables setting DTCs and inhibits normal communication*/ 
IF ( (device cannot enter high speed 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 $78) /* RequestCorrectlyReceived-ResponsePending */ 
ENDIF 
programming_mode_entry_OK 

YES 
high_speed_mode_entry_OK 

YES 
send Positive Response ($E5) 
ENDIF 
WHEN ($Level = LEV_EPM) /* ($03) Enable Programming */ 
/* verify that a previous request was sent with $Level = LEV_RQPM or */ 
/* $Level = LEV_RQPM_HS */ 
IF (programming_mode_entry_OK = NO) THEN 
send Negative Response ($7F $A5 $22) /* ConditionsNotCorrect */ 
ELSE
IF (high_speed_mode_entry_OK = YES) THEN 
CALL hnd_Invoke_High_Spd_Mode() /* handler function */ 
high_speed_mode_active 

YES 
ENDIF 
programming_mode_active 

YES
ENDIF 
OTHERWISE 
send Negative Response ($7F $A5 $12) /* Invalid Format */ 
IF ((programming_mode_entry_OK = YES) AND
(programming_mode_active = NO)) THEN 
programming_mode_entry_OK 

NO 
high_speed_mode_entry_OK 

NO 
ENDIF 
ENDSELECT 
ENDIF 
ENDFUNCTION 
8.17.7 Node Verification Procedure.