Страница 1 мировой engineering стандарты общая спецификация

Table 214: Example Data PCM CPID $02 Definition
Control
Byte #
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
1
EGR
Enable
2
3
EGR Duty Cycle: Linear Scaling
0 counts = 0%, 255 counts = 100%
4
Based on the above definition, CPID $02 contains 4 bytes of control data. CPID $02 allows the tool to take
control of the Exhaust Gas Recirculation (EGR) Valve by making bit 0 of byte 1 a 1, and then placing a value
corresponding to the desired duty cycle to the valve in data byte 3. The unused bits are ignored for the
purposes of the example in this section.
The example in this section also assumes the following:
•
The point-to-point request CAN Id for the PCM is $241.
•
The USDT response CAN Id for the PCM is $641.
•
The PCM has a device control restriction built in which will not allow the tool to command an idle speed
above 1000 rpm if the vehicle is in gear.
•
The value of the 2-byte reject code for the rpm limitation while the vehicle is in gear is $0902.
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Page 242
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
8.20.5.2 DeviceControl (EGR and IAC Control). 
In this example (Tables 215 thru 217), the tool will send a
series of messages to verify the EGR system. The tool will request the PCM to raise the desired idle speed to
1500 rpm and after the rpm has stabilized at the commanded value, the tool will send a second request to
open the EGR valve by requesting a 50% duty cycle. The TesterPresent ($3E) messages will not be shown in
the example but are assumed to be sent. The message to monitor the engine speed are also not shown in this
example but are assumed to be sent on the bus.
Table 215: DeviceControl Example Message Flow to Elevate RPM