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

ConsecutiveFrame
ConsecutiveFrame
ConsecutiveFrame
ConsecutiveFrame
FlowControl
FirstFrame
WuP
N_USData_FF.ind
N_USData.ind
GMLAN
Handler
Diagnostic
Application
:
Activate application
triggered diagnostic VN
Tester
application
triggered
diagnostic
VN active
ECU_IN_STANDBY
COMM_INIT
COMM_ENABLED
COMM_ACTIVE
Communication State
initally active
diagnostic
VN active
8 sec
initally active
diagnostic VN
deactivated
Reset and disable
Appl_Diag_VN_Timer
DIAG_DISABLED
DIAG_ACTIVE
TIMER_OFF
Application State
request
DIAG_INACTIVE
Figure 12: Application Triggered Diagnostic VN - Activation via FirstFrame Indication 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 45 of 336 
Note:
In Figure 12, it is assumed the node is in the ECU_IN_STANDBY state at the time the Tester initiates 
the WuP. 
5.2.6 Keeping the Application Triggered Diagnostic VN Active. 
The diagnostic application shall keep the 
application triggered diagnostic VN active as long as the Appl_Diag_VN_Timer has not expired. (Refer to 
paragraph 5.2.4 for the detailed handling of the Appl_Diag_VN_Timer - reset, disable and enable conditions.) 
5.2.7 Deactivation of the Application Triggered Diagnostic VN. 
The diagnostic application shall notify the 
GMLAN Handler to deactivate application triggered diagnostic VN when the Appl_Diag_VN_Timer elapses. At 
this time the diagnostic application shall transition to the DIAG_INACTIVE state. 
Figure 13 shows a case where diagnostic mode is not active and the ECU is sending a multiple frame 
response to a received request. 
Note:
It is assumed that the application triggered diagnostic VN is the only active VN. 
Figure 14 shows a case where diagnostic mode is not active and the requested diagnostic service results in 
3 UUDT responses. 
Note:
It is assumed that the application triggered diagnostic VN is the only active VN. 
FlowControl
FirstFrame
ConsecutiveFrame
ConsecutiveFrame
ConsecutiveFrame
N_USData.req
N_USData.con
GMLAN
Handler
Diagnostic
Application
:
Deactivate application
triggered diagnostic VN
Tester
COMM_ACTIVE
Communication State
COMM_ENABLED
ECU_READY
Enable
Appl_Diag_VN_Timer
(diagnostic
mode is not active)
application
triggered
diagnostic
VN active
VN deactivated
response
4-8 sec
Timeout
DIAG_ACTIVE
TIMER_OFF
DIAG_ACTIVE
TIMER_ON
DIAG_INACTIVE
Application State
DIAG_DISABLED
Note:
It is assumed that the application triggered diagnostic VN is the only active VN so when the diagnostic application deactivates it, the 
ECUs communication kernel transitions to COMM_ENABLED.