Страница 1 мировой engineering стандарты общая спецификация

Table 227: Steps of the RequestInfo Process
Step Action
1
Wake-up link(s) - 
High voltage wake-up for SWCAN 
- gateways may cascade wake-ups (where
applicable) across to the other subnets on the vehicle or the tester may need to use 
level $04 
of
diagnostic service 
InitiateDiagnosticOperation ($10) 
to generate the wake-up (functionally
addressed to gateway ECUs only). 
Note: 
The tester must allow at least 500 ms after issuing a
wake-up before transmitting any diagnostic request message (including tester present) to allow the
ECU to process the wake-up and transition to a communication active state – see paragraph 6.1 for
wake-up requirements.
2
Start sending 
TesterPresent ($3E) 
periodic messages to all nodes - all links as needed (using the
AllNodes CANId and AllNodes extended address).
3
Use service 
ReadDataByIdentifier ($1A) 
service to determine diagnostic addresses and CAN
Identifiers for all ECU(s) (excluding SPS_TYPE_C) on each subnet (setup of base diagnostic
configuration matrix), 
DID $B0.
•
This determines the relationship of each ECU’s diagnostic address and its physical request and
response CAN Identifiers.
•
SPS_TYPE_C ECUs would not respond since diagnostic responses have not been enabled yet.
•
This step and the ReportProgrammedState ($A2) service step which occurs later in the process
allows the utility file to only contain the node diagnostic address. The tester correlates the
diagnostic address to the physical request and response CAN Identifiers.
4
optional
step
Send an 
InitiateDiagnosticOperation ($10) 
request with a sub-parameter value of 
$02
(disableAllDTCs) 
using the AllNodes request CANId and the AllNodes extended address.
•
This step ensures that nodes that poll the CAN controller do not set DTCs if they do not process

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the mode $28 request (in the next step) before they could possibly set signal supervision
failures.
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