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


Functional  ClearDiagnosticInformation



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Functional 
ClearDiagnosticInformation 
Request 
(Table 
46).
The 
tester 
sends 

ClearDiagnosticInformation request message to a functional system using the all node functional request 
CANId ($101):
 

Functional system: $FD = Gateway Devices. 

Physical nodes: 
Node #1: USDTResponseCANId: $641. 
Node #2: USDTResponseCANId: $642. 
Table 46: ClearDiagnosticInformation Targeted to Functional System 
T = Frame Sent By Tester; N = Frame Sent By Node; shaded region indicates PCI 
Frame Type 
CAN Id 
#1 
#2 
#3 
#4 
#5 
#6 
#7 
#8 
T(USDT-SF) 
$101 
$FD 
$01 
$04 
--- 
--- 
--- 
--- 
--- 
N(USDT-SF) 
$641 
$01 
$44 
--- 
--- 
--- 
--- 
--- 
--- 
N(USDT-SF) 
$642 
$01 
$44 
--- 
--- 
--- 
--- 
--- 
--- 
8.1.6 Node Interface Function. 
8.1.6.1 Node 
I
nterface Data Dictionary (Table 47). 
Table 47: Node Interface Data Dictionary of ClearDiagnosticInformation Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length 
Reference Common/Global Pseudo Code 
Data Dictionary For Definition Of These 
Flags/Variables 
8.1.6.2 Node Interface Pseudo Code. 
The following logic is executed upon receipt of a 
ClearDiagnosticInformation ($04) service request message: 
Powerup States: 
None 
Each time a $04 message is received, the following logic is executed: 
BEGINFUNCTION Serv_04_Msg_Recvd() 
IF (message_data_length != 1) THEN 
send Negative Response ($7F $04 $12) /* SubfunctionNotSupported-InvalidFormat */ 
ELSE 
IF (conditions are not correct to clear diagnostic information) THEN 
send Negative Response ($7F $04 $22) /* ConditionsNotCorrect */ 
ELSE 
IF (the ECU cannot continue to process diagnostics while the DTC clear is in process) THEN 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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