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What is the UDS protocol?
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ISO 14229. Unified Diagnostic Services (UDS) is a communication protocol used in automotive Electronic Control Units (ECUs) to enable diagnostics, firmware updates, routine testing and more.
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UDS message structure
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CAN ID
PCI-DL: Protocol Control Information SI: Service Identifier Sub function byte Data |
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Negative Response
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CAN ID
PCI-DL 0X7F SI NRC |
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NRC 0X21
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busyrepeatrequest
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NRC 0X11
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servicenotsupported
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NRC 0X7F
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Servicenotsupportedinactivesession
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NRC 0X33
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securityaccessdenied
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NRC 0X31
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requestoutofrange
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Diagnostics Data Length (DL) 0x0x
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single frame
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Diagnostics Data Length (DL) 0x1x
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first frame
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Diagnostics Data Length (DL) 0x2x
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consecutive frame
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Diagnostics Data Length (DL) 0x3x
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flow control
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SID 0x10
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Diagnostic session control
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SID 0x11
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ECU reset
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SID 0x27
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security access
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SID 0x28
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communication control
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SID 0x3E
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Tester present
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SID 0x85
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Control DTC setting
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SID 0x22
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read data by identifier
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SID 0x23
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read memory by address
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SID 0x2E
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write data by identifier
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SID 0x3D
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Write memory by address
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SID 0x14
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clear diagnostic information
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SID 0x19
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read DTC information
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SID 0x31
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routine control
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Service 0x10 sub functions
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0x01 Defaul session
0x02 programming session 0x03 extended DS |
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ECUReset (0x11) sub funtion
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0x01 hardReset
0x02 keyOffOnReset 0x03 softReset |
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SecurityAccess (0x27)
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0x01 requestSeed
0x02 sendKey |
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CommunicationControl (0x28) -
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0x00 enableRxAndTx
0x01 enableRxAndDisableTx 0x02 disableRxAndenableTx 0x03 disableRxAndTx |
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TesterPresent (0x3E) -
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0x00 zeroSubFunction
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RoutineControl (0x31)
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0x01 Start Routine
0x02 Stop Routine 0x03 Request Routine Results |
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ControlDTCSetting (0x85) -
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0x02 on
0x03 off |
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ReadDTCInformation (0x19)
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0x01 reportNumberOfDTCByStatusMask
0x02 reportDTCByStatusMask 0x06 reportDTCExtDataRecordByDTCNumber 0x0A reportSupportedDTC |
