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


Table 130: DefinePIDbyAddress with 3-Byte memoryAddress



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Table 130: DefinePIDbyAddress with 3-Byte memoryAddress 
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 
$07 
$2D 
$CC 
$FF 
$01 
$11 
$02 
$02 
N(USDT-SF) 
$641 
$03 
$6D 
$CC 
$FF 
--- 
--- 
--- 
--- 
8.11.6 Node Interface Function. 
8.11.6.1 Node Interface Data Dictionary (Table 131). 
Table 131: Node Interface Data Dictionary of ReadMemoryByAddress Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length 
Security_Access_Unlocked
Reference Common/Global 
Pseudo 
Code 
Data 
Dictionary For Definition Of 
These Flags/Variables 
Bad_Address 
Status flag that indicates whether any of the range of addresses in the request is 
not valid.
 
TRUE/FALSE 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 153 of 336 
Variable/Meaning 
Values 
memoryAddress 
This is the starting address in ECU memory from the request message. 
Varies based on ECU 
numAddressBytes 
This is a local variable used to identify the number of bytes in the tester request 
message for the memoryAddress parameter. 
2 to 4, depending on ECU 
Addressing scheme 
memorySize 
This is the number or consecutive memory addresses that the tester has 
requested (parameter of request message). 
$01 to $07 
Memory_Address 
This is a local variable used to point to ECU memory when indexing through the 
requested addresses to determine if any portion of the requested memory is 
invalid, protected, or requires security access. The pseudo code uses 
Memory_Address.data to reflect the contents of a given memory address. 
Varies based on ECU 

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