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1、丰田LS400轿车ABS电控系统的故障诊断与检测LS400carismainlycomposedofECU,fourwheelspeedsensors,composedofoilpumpandthreesolenoidvalveofbrakepressureadjustingdeviceandbrakealarmdevice・ThefauItdiagnosisofIGpowercircuitFirstcheckbatteryvoltageandshouldbewithin1014V.(2)removetheconn
2、ectoroftheABS(TRC)andECU,ignitionswitchchecktheECUcormectorterminalvoltagebetweenIGandGND,shallbethebatteryvoltage・(3)measuretheECUconnectorterminalsbetweenGNDandbodytakethewireresistance,resistanceshouldbe0Q.(4)removedfromtheconnectionbox1ECU-IGfuseandcheck,i
3、fnotconduction,shouldcheckallwiring,connectedtotheECU一IGthefuseelementisshortcircuit;IftheguideshouldcheckwhetherthewiringandconnectorbetweentheECUandthebatteryareopen.FaultdiagnosisofanABSactuatorelectromagneticrelaycircuit(1)removetheairfilterandpiping,relea
4、seABSactuatorconnector,detectAlterminal,between2and4A2terminalvoltageshallbethebatteryvoltage・ThewiringandconnectorbetweenthebatteryandtheABSactuator,theABSactuatorandthebodyrailarenotnonna1.ChecktheABSactuator:A2terminal2andterminal5.A3terminal2andA2terminal4
5、shouldguide;Alterminal2doesnotleadtoA3terminal2.IfthebatteryvoltageappliedbetweenA2terminal2and5,theA3terminalsbetween2and4A2terminalnotconduction,AlandA3terminal2conductionterminal2.TheABSactuatorrelayshouldbecheckedforimproperuse・ChecktheABSactuatorelectroma
6、gneticrelay:terminals1and3shouldguide;Terminals2and4shouldbeguided;Terminal4and5unconductance・Ifbatteryvoltageisappliedbetweenterminals1and3,terminal2and4shouldnotbedirected,terminals4and5shouldbeguided・Abnormalchangeofelectromagneticrelay.Checkthewiringandcon
7、nector,ECU,andsoonbetweentheECUandtheABSactuator・FaultdiagnosisofanABSactuatoroilpumprelaycircuit1)removetheairfilterandpiping,releaseABSactuatorconnector,ignitionswitch〃0N〃，measurementofABSactuatorwiringconnectorsideAlvoltagebetweenterminals1andbodybyironwire
8、,shallbethebatteryvoltage,abnormalrepairbatteryandactuators,actuators,andtakethewirebetweenbetweenwiringandconnectors・ChecktheABSactuatorconnector:A2terminals1and5shouldbeconduced;
