OBD-II通讯协议

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1、OBD-II通讯协议OBD-IINetworkStandards»J1850PW–AdoptedbyGM;alsoknownasClass2.–AdoptedbyChrysler(knownasJ1850).–SomereferencestoPWmodeheardaboutinregardstoToyota(andHonda?).–10.4kbps,singlewire.»J1850PWM–AdoptedbyFord;alsoknownasStandardCorporateProtocol(SCP).–AlsoseeninsomeMazdaproducts.–Somerefer

2、encestoPWMmodeheardaboutinregardstoMitsubishi.–41.6kbps,twowirebalancedsignal.»ISO9141andISO9141-2(alsoknownasISO9141CARB)–SeeninsomeChryslerandMazdaproducts.–SeemstobemorecommoninEurope.–10.4kbps,singlewire.OBDII通讯协议obdiigenericcommunicationprotocolsbymanufacturerRecentlyItriedtoinstallmypr

3、oductonPeuzeot(406orsomethingsimilar).TherewasKWP2000bus.Itriedtogetthespeedaluefromthebusbysendingthefollowingstring0xc20x330xf10x010x0d0xf4.OnresponceIreceiedtwoanswersfrom2differentECUs:1)0x830xf10x100x7f0x010x120x161)0x830xf10xa40x410x0d0x000x66ThefirstECUsentmeNACK(Thisresponsecodeindic

4、atesthattherequestedactionwillnotbetakenbecausetheserer(ECU)doesnotsupporttheargumentsoftherequestmessageortheformatoftheargumentbytesdonotmatchtheprescribedformatforthespecifiedserice.)Myquestionis:iftherewassomethingwrongwiththeargumentsoftherequestmessage,thesecondECUalsoshouldnotundersta

5、ndtherequest,bititdid!Andthesecondquestionis:whythefirstECUdidsendthenegatieanswer.Ifyoulookatthej1979PDFyouwillfindtherethat"IfanECUdoesnotsupportanyofthePIDsrequesteditisnotallowedtosendanegatieresponsemessage".OBD信息：我理解的OBD-II标准诊断插座列表我理解的obd-ii标准诊断插座列表端子号称端子接线-----------------------------

6、----------------------------------------4搭铁16蓄电池正极，9-127，15资料数据传输线（iso9141-2）5信号反馈线搭铁2saej1850数据输送线10sae制造厂数据输送线举一实例；捷达前卫诊断座t16中；就有1647三个端子按以上要求接线。EOBD欧洲标准新的europeanobd诊断坐连接标准dlc-j1962================================================================================pin1......saej2411,gmsinglew

7、irecan;通用公司单线can-buspin2......iso11519-4(bus+)(saej1850),和10号脚同时使用,41.6kbpspwm脉宽调制单线用法:只用2号脚1根线通讯10.4kbpspw可变脉宽调制byteheader+crc,no"checksum"or"inter-byteseparation"(inframeresponsebyte?)pin3......chrysler,ccd+(notobd);克莱斯勒ccd-bus网线h线pin4......底盘地ch