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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 176 of 336
8.15.4 Supported Negative Response Codes (RC_). 
The following negative response codes shall be
implemented for this service. See Table 155.
Table 155: Supported Negative Response Codes
Hex Description
Cvt Mnemonic
12
SubFunctionNotSupported-InvalidFormat
If the length of the request message is invalid.
M
2
SFNS-IF
Where:
M
2 
= A negative response message shall only be sent if the request message was invalid for the above
reasons and the request was physically addressed.
8.15.5 Message Flow Example TesterPresent.
8.15.5.1 TesterPresent. 
The tester sends a TesterPresent request message to a physical node, which
requires a response message from the addressed node. See Table 156.
Network parameter:
•
Node physicalRequestCANId = $242.
•
Node USDTResponseCANId = $642.
Table 156: Physically Requested TesterPresent (response required)
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)
$242
01
$3E
---
---
---
---
---
---
N(USDT-SF)
$642
$01
$7E
---
---
---
---
---
---
The tester sends a TesterPresent request message to a functional system. See Table 157.
Network parameter:
•
Functional System Address (FSA): $FE = All nodes.
•
The nodes shall not send a positive response message.