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 55 of 336 
is capable of sending the final USDT response (positive response or negative response with a response 
code other than $78) or the first UUDT response message. 

For its final USDT response message or UUDT response message the ECU has to make sure that the 
single frame response message (positive or negative response other than response code $78), the first 
frame of a multi-frame response message or the first UUDT response message is completed (transmitted 
on to the CAN bus) within the last requested P2
CE
*. 

The ECU shall be able to receive and process a functionally addressed TesterPresent service request 
messages while it has activated the enhanced response timing and prepares the final response message. 
Note:
This functionality shall keep a node in a previously activated diagnostic mode of operation if the 
preparation of the final response message takes longer than P3
C

Table 29: ECU P2
CE
* Timing Parameter Value 
Parameter 
Description 
Minimum 
(CEmin*) 
[ms] 
Maximum 
(CEmax*) 
[ms] 
P2
CE

Enhanced response timing for a single ECU 

5000 
Note 1
Note 1:
OBD/EOBD devices are required to support the timing value P2
CE*
as specified in ISO15031-5 (referred to as P2*
CAN
in 
ISO 15031-5) for emission related services. An OBD/EOBD device may choose to use a single value for P2*
CE
for both emission related 
and enhanced diagnostic services provided that the maximum value used is not greater than the value specified in this table. 

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