统一诊断服务 (Unified diagnostic services , UDS) (六) 这篇文章将介绍InputOutputControlByIdentifier (0x2F) 和RoutineControl (0x31) 这两个诊断服务的用途和用法。它俩的作用有点类似,都是调用ECU内部一些预定义的操作序列,相当于是我们从外部利用诊断手段控制ECU的接口。 InputOutputControlByIdentifier (0x2F)...
回顾接触UDS的过程 自毕业后,我一直干了2年的Autosar CAN通讯开发。 开发的主要内容简单概括就是:应用报文开发、网管报文开发、休眠唤醒开发,及CAN网络相关故障开发,并没有涉及UDS开发,但虽然没有涉及开发,但多多少少都听过一点(特别是后来跑路的时候,恶补了学习了一手,嘿嘿)。 我刚开始接触诊断相关内容的时候...
Functions 1) Erase Error Memory ($14 Clear Diagnostic Information) Parameter 1: Service ID = $14 Parameter 2: Diagnostic Trouble Code (DTC) with three byte length 2) Sub-Functions for Service $19 Read DTC Information Hex Description 01 Report number of DTC by Status Mask 02 Report DTC by...
Particularly for vehicle registration, manufacturers are required to comply with strict exhaust emission limits. External test devices, also known as OBD scan tools, are used to retrieve the emissions-relevant information via diagnostic service requests. All emission-relevant control units must have a c...
873 switch(frame.data[2 + offset]) { // Subfunctions 874 case UDS_READ_STATUS_BY_MASK: // Read DTCs by mask 875 if(verbose) { 876 plog(" + Read DTCs by mask\n"); 877 if(frame.data[3 + offset] & DTC_SUPPORTED_BY_CALIBRATION) plog(" - Supported By Calibration\n"); 878...
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In most UDS request services, various types of request data parameters are used to provide further configuration of a request beyond the SID and optional sub function byte. Here we outline two examples. Example #1: Service 0x19 lets user read DTC information. ...
str_ECU_name = uds22Service_response(self.udsHandle, request_read_ECU_name, response_value_type_ASC) logger.info("ECU_name: {}".format(str_ECU_name)) #读NTC温度 22 FD 0A request_read_NTC_temperature = (c_uint8*3)(0x22,0xFD, 0x0A) str_NTC_temperature = uds22Service_respons...
9.1 Service description 9.2 Request message 9.2.1 Request message definition 9.2.2 Request message SubFunction parameter $Level (LEV_) definition . 9.2.3 Request message data-parameter definition . 9.3 Positive response message 9.3.1 Positive response message definition ...
(what is to follow) Service ID Byte 2 ArbID B1 B2 B3 B4 B5 B6 B7 B8 7E2 03 19 02 08 00 00 00 00 Service Sub-Functions Bytes 3 through Byte 8 62 Parts of a Single Frame RX Message (Physically Addressed, USDT) ArbID ECU ID + $08 Data Length Byte 1 Example: Req odes Response...