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8.18.3.5 Positive Response Message Data Parameter Definition. 
Table 181 specifies the response
message data parameter definitions for this service.
Table 181: Request Data Parameter Definition
Definition
MessageNumber
This data byte of the UUDT response message contains the sub-function parameter of the request message.
DTCHighByte, DTCLowByte, DTCFailureTypeByte
DTCHighByte, DTCLowByte and DTCFailureTypeByte together represent a unique identification number for a
specific diagnostic trouble code supported by a device. The DTCHighByte and DTCLowByte represent a circuit
or system that is being diagnosed. The DTCFailureTypeByte represents the type of fault in the circuit or
system (e.g., sensor open circuit, sensor shorted to ground, algorithm based failure, etc). Definition of the
DTCFailureTypeByte can be found in Appendix E of this specification.
DTCStatusByte
The status of a particular DTC. (e.g., DTC failed since power up, passed since power up, etc.) The definition of
the bits contained in the DTCStatusByte can be found in Appendix E of this specification.
DTCStatusAvailabilityMask
A byte whose bits are defined the same as DTCStatusByte and represents the status bits that are supported
by the device.
DTCCountHighByte, DTCCountLowByte
A count of the number of DTCs that match the DTCStatusMask included in a sendOnChangeDTCCount
request message.
8.18.4 Supported Negative Response Codes (RC_). 
The following negative response codes shall be
implemented for this service. The circumstances under which each response code would occur are
documented in Table 182.

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