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


GM WORLDWIDE ENGINEERING STANDARDS



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 53 of 336 
Figure 19: Tester P2
C
 Timing Parameter Definition - Single Frame Response Messages 
In Figure19, the tester transmits a functionally addressed request message (single frame message) and three 
ECUs respond. Each ECU responds with a single frame response message. If the tester knows the number of 
responding ECUs, then the next request message can be transmitted immediately after the reception of the 
last response message. If the number of responding ECUs is not known, then the tester shall wait until a P2
CT
timeout occurs before transmitting the next request message. See Figure 20. 
Figure 20: Tester P2
CT
 Timing Parameter Definition - Single and Multi-Frame Response Messages 
In Figure 20, the tester transmits a functionally addressed request message and three ECUs respond. Two 
ECUs respond with a single frame response message and one ECU responds with a multi-frame response 
message. The tester has to wait until each response message is completely received before transmitting the 
next request message. 
If the P2
CT
application timer is not timed out at the point in time when the last pending multi-frame response 
message is completely received and the tester does not know the number of responding ECUs, then the tester 
has to wait for a timeout of P2
CT
before transmitting the next request message. If the tester knows the number 
Request
USDT-SF
USDT-SF
USDT-SF
Start (150)
Restart(150)
Restart(150)
Next Request
Next Request
number of responding
ECUs known
number of responding
ECUs NOT known
Restart(150)

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