Страница 1 мировой engineering стандарты общая спецификация

GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 90 of 336
8.3.5 Message Flow Examples. 
The example below (Table 64) shows a request for the failure record
identifiers of the PCM followed by a request for the data parameters from one of the failure records which
contains a DTC. The example assumes the following information to be true:
•
The point to point request CAN Id for the PCM is $241.
•
The USDT response CAN Id for the PCM is $641.
•
The PCM contains failure record numbers $00, $01, $02, and $03.
•
A failure record is stored for DTC P1671 ($16 $71) with a DTC Fault Type byte = $00 in both failure record
$00 (freeze frame) and $01 (first failure record).
•
No DTCs are stored in failure records $02 and $03.
•
The PCM supports providing failure record data with PIDs.
•
Engine rpm is a 2-byte parameter stored in the failure record and is identified by PID# $000C.
•
Vehicle Speed is a 1-byte parameter stored in the failure record and is identified by PID# $000D.
•
Manifold Pressure is a 1-byte parameter stored in the failure record and is identified by PID# $000B.
•
Engine Coolant Temperature is a 1-byte parameter stored in the failure record and is identified by
PID# $0005.
•
The USDT flow control parameters Block Size (BS) and Separation Time (ST) are both $00.
8.3.5.1 Example #1 - Obtain Failure Record Identifiers.
Table 64: Example 1 ReadFailureRecordData Message Flow
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
$12
$01
---
---
---
---
---
N(USDT-FF)
$641
$10
$0B
$52
$01
$00
$00
$16
$71
T(USDT-FC)
$241
$30
$00
$00
---
---
---
---
---
N(USDT-CF)
$641
$21
$00
$01
$16
$71
$00
---
---