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1、OBD-II通訊協(xié)議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通訊協(xié)議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標(biāo)準(zhǔn)診斷插座列表我理解的obd-ii標(biāo)準(zhǔn)診斷插座列表端子號(hào)稱端子接線-----------------------------
6、----------------------------------------4搭鐵16蓄電池正極，9-127，15資料數(shù)據(jù)傳輸線（iso9141-2）5信號(hào)反饋線搭鐵2saej1850數(shù)據(jù)輸送線10sae制造廠數(shù)據(jù)輸送線舉一實(shí)例；捷達(dá)前衛(wèi)診斷座t16中；就有1647三個(gè)端子按以上要求接線。EOBD歐洲標(biāo)準(zhǔn)新的europeanobd診斷坐連接標(biāo)準(zhǔn)dlc-j1962================================================================================pin1......saej2411,gmsinglew
7、irecan;通用公司單線can-buspin2......iso11519-4(bus+)(saej1850),和10號(hào)腳同時(shí)使用,41.6kbpspwm脈寬調(diào)制單線用法:只用2號(hào)腳1根線通訊10.4kbpspw可變脈寬調(diào)制byteheader+crc,no"checksum"or"inter-byteseparation"(inframeresponsebyte?)pin3......chrysler,ccd+(notobd);克萊斯勒ccd-bus網(wǎng)線h線pin4......底盤(pán)地ch
