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


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RequestCorrectlyReceived-ResponsePending 

This response code shall be sent if reading the data from the address(es), 
which is referenced by the dataIdentifier, takes longer than P2
C
ms (e.g., 
the data to be read has to be retrieved from another processor via an ECU 
internal Serial Peripheral Interface (SPI) bus). 

This response code shall be sent if the ECU operating conditions are such 
that the request temporarily cannot be performed (e.g., the data to be 
retrieved cannot be read from EEPROM because another application task 
is currently writing to EEPROM). 

RCR-RP 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 96 of 336 
 
8.4.5 Message Flow Example ReadDataByIdentifier Service. 
8.4.5.1 ReadDataByIdentifier(dataIdentifier=VIN). 
The example below (Table 73) shows how the 
ReadDataByIdentifier(dataIdentifier=VIN) service shall be implemented. The example assumes the following 
information to be true: 

The point to point request CAN Id for the ECU is $241. 

The USDT response CAN Id of the ECU is $641. 

The Data Identifier for the Vehicle Identification Number (VIN) is $90 (as defined in Appendix C). 

The USDT flow control parameters Block Size (BS) and Separation Time (ST) are both $00. 
Table 73: ReadDataByIdentifier(dataIdentifier=VIN) 
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) 
$241 
$02 
$1A 
$90 
--- 
--- 
--- 
--- 
--- 
N(USDT-FF) 
$641 
$10 
$13 
$5A 
$90 
“W” 
“0” 
“L” 
“0” 
T(USDT-FC) 
$241 
$30 
$00 
$00 
--- 
--- 
--- 
--- 
--- 
N(USDT-CF) 
$641 
$21 
“J” 
“B” 
“F” 
“3” 
“5” 
“W” 
“1” 
N(USDT-CF) 
$641 
$22 
“0” 
“4” 
“2” 
“7” 
“6” 
“5” 
--- 

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