Страница 1 мировой engineering стандарты общая спецификация

ReadStatusOfDTCByStatusMask
Allows a tester to read DTC status information from a single node or group of nodes for a
given status mask.
M
82
SendOnChangeDTCCount
Allows a tester to retrieve a message which indicates the number of DTCs that match a
tester defined status mask. The ECU shall calculate the count information in a
background loop and transmit an updated count value each time the computation results
in a different value than the last computation.
U
83 thru
8F
Definition.'>ReservedByDocument
This value is reserved by this document for future definition.
M
8.18.2.5 Request Message Data Parameter Definition. 
Table 176 specifies the data parameter definitions for
this service.
Table 176: Request Data Parameter Definition

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Definition
DTCHighByte, DTCLowByte, DTCFailureTypeByte
DTCHighByte, DTCLowByte and DTCFailureTypeByte together represent a unique identification number for a
specific diagnostic trouble code supported by a device.
DTCStatusMask
The DTCStatusMask contains eight DTC status bits. The definitions for each of the eight bits can be found in
Appendix E. This byte is used in the request message to allow a tester to request DTC information for the
DTCs whose status matches the DTCStatusMask. A DTCs status matches the DTCStatusMask if any one of
the DTCs actual status bits is set to 1 and the corresponding status bit in the DTCStatusMask is also set to 1.
8.18.3 Positive Response Message Definition. 
Positive response(s) to service $A9 requests are of type
UUDT. Depending on the sub-parameter in the service request, the receiving node(s) may transmit multiple
UUDT response messages containing DTC information. The tester can identify individual UUDT messages by
matching the sub-function parameter of the request message and the UUDT message number in the response
message. The number of data bytes after the message number depends on the sub-function parameter in the
request message.
For sub-function level $81, a UUDT endOfDTCReport message shall be sent after all ($81) UUDT messages
containing DTC information have been returned to the tester.
The tables below define the response message formats of each sub-function parameter.