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



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#2 
#3 
#4 
#5 
#6 
#7 
#8 
T(USDT-SF) 
$101 
$FE 
03 
$22 
$00 
$0C 
--- 
--- 
--- 
N1(USDT-SF) 
$7E8 
$05 
$62 
$00 
$0C 
$0B 
$B8 
--- 
--- 
N2(No Resp) 
8.6.5.4 Functionally Request PID Resulting In Multi-Frame Response. 
In the example below (Table 88), 
the following is assumed true: 

The vehicle bus has multiple ECUs but only one ECU supports the requested PID. 

The PID requested is $FF0D (this is only an example). 

PID $FF0D is defined to be seven bytes in length. 

The point to point request CAN Id for the responding ECU is $7E0. 

The USDT response CAN Id of the responding ECU is $7E8. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 112 of 336 
Table 88: Functional ReadDataByParameterIdentifier(Multi-Frame Response) 
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) 
$101 
$FE 
03 
$22 
$FF 
$0D 
--- 
--- 
--- 
N(USDT-FF) 
$7E8 
$10 
$0A 
$62 
$FF 
$0D 
$aa 
$bb 
$cc 
T(USDT-FC) 
$7E0 
$30 
$00 
$00 
--- 
--- 
--- 
--- 
--- 
N(USDT-CF) 
$7E8 
$21 
$dd 
$ee 
$ff 
$gg 
--- 
--- 
--- 
8.6.5.5 Functionally Request Two PIDs Resulting In Response from Multiple ECUs. 
In the example below 
(Table 89), the following is assumed true: 

The vehicle bus has two ECUs that support this service and both ECUs support requesting at least two 
PIDs in a single request. 

The point to point request CAN Id for ECU 1 is $7E0 and the USDT response CAN Id is $7E8. 

The point to point request CAN Id for ECU 2 is $7E2 and the USDT response CAN Id is $7EA. 

The PID for engine rpm (as defined in SAE J1979/ISO 15031-5) is $0C (so this service requests with 
$000C). The data returned is two bytes with a transfer function of rpm = N/4. 

Engine Speed is assumed to be 750 rpm at the time of the request. 

The PID for Transmission range select (PRNDL) is PID $194F. 

This PID has one byte of response data where $00 = illegal range, $01 = Park, $02 = Reverse,
$04 = Neutral, $06 = Drive 6, $08 = Drive 5, $10 = Drive 4, $20 = Drive 3, $40 = Drive 2, and
$80 = Drive 1. 

The gear select position is assumed to be park for this example. 

ECU 1 supports PID $000C but not PID $194F. 

ECU 2 supports PID $194F but not $000C. 
Table 89: Functional ReadDataByParameterIdentifier (Multi-PID Request) 
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) 
$101 
$FE 
03 
$22 
$00 
$0C 
$19 
$4F 
--- 
N(USDT-SF) 
$7E8 
$05 
$62 
$00 
$0C 
$0B 
$B8 
--- 
--- 
N(USDT-FF) 
$7EA 
$04 
$62 
$19 
$4F 
$01 
--- 
--- 
--- 

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