博世机械式燃油喷射系统 Bosch.Mechanical.Gasoline.Fuel-Injecti

ENGINEFAiLSTOSTART(coldorwarm)TestconditionsPossiblecauseFuelintank.FuelpumpdefectiveBatteryvoltagesufficient.SensorplateorcontrolpistonnotmovingfreelyValveclearanceandmechanicalconditionofenginecorrect.IntakeairsystemleakingIgnitionsysteminorder.SensorplatestoptoolowNooperatingerror(handthrottleleverpulled)*.Fuelpressuredoesnotbuildup.Coldstartdevicedefective,enginefloods8Auxiliaryairvalvedefective2ENGINEFAILSTOSTART(coldorwarm)PossiblecauseDiagnosisRepairprocedure*Testminimumvoltageatpumpconnectiol1terminalwithvoltmeterITurnonignition,fuelpumpmuststartaudiblyMinimumvoltage:11.5VCurrentconsumptionwhenrunning:between6.5and8.5A3Turnonignition,disconnectairsensorcontact,fuelpumpmuststartaudibly.From1976model.FuelpumpllFuelpumprunsdoesnotrunPossiblecauseENGINEFAILSTOSTART(coldorwarm)RepairprocedureSensorplateorcontrolpistonnotmovingfreelyIntakeairsystemleakingDiagnosisReplacefuelpump.Checkleadsandconnections.Eliminatefaults.Turnignitionoff.Removeairfilterbreatherwithplatefilterandliftsensorplateleverfrombelow.Resistancemustbeuniformthroughoutlevertravel.OnrapiddownwardmovementtheslowmovementofthecontrolpistonIiftsitawayfromthelever;theremustbenonoticeableresistance,however.ENDChecksensorplateandcontrolpistonforsmoothmovement4SensorplateandcontrolpistonmovefreelySensorplateandcontrolpistondonotmovefreelyheavymovementatbeginningonly:sensorplatetouchesairventuri.IRemovecontrolpiston,polishcarefuIlyinthisareawithcrocusclothRemovemixturecontrolunitreadjustsensorplate,seeappendixforprocedure.ENDChecktightnessofintakeairsystem(vacuumsystem).SeeTechnicalInformationGr.2,No.3,dated5.7.75Note:Onlyseriousleakscausetheenginenottostart,e.g.rubberbellowsdisconnected.Withminorleakstheenginestarts,butrunsunevenly(seeidlingdefects).5ENGINEFAILSTOSTART(coldorwarm)PossiblecauseDiagnosisRepairprocedureNoleaksfound.ENDReleasepressureinfuelsystem.Forthispurposeloosenpressurefuellineconnectedtowarm-upregulatoratfueldistributorslightlytoreleaseremainingpressure.Wraparagaroundtuellinetotrapexcessfuel.Theupperedgeofthesensorplatemustnowbeflushwiththetaperedgeatthepointshowninthediagramontheleft.Sensorplatestoptoolow.Removerubberbellowsbetweenmixturecon-trolunitandthrottlehousing,checksensorplateposition.EItnecessary,anadjust-mentcanbemadebybendingthespringclip(arrowinfigureabove).Fromthe1977modeltheadjustmentismadebyturningthescrewshown(arrowinfigureonright).IJ\fteradjusting,checksensorplateforfreemove-ment.Checksensorplatepositionunderpressure:switchonfuelpump.Theadjustedpositionofthesensorplatemustn9tchangebymorethan0.5mm.Whencontrolpressureisapplied.ChangewithintoleranceIimits.Sensorplatepositionchangesbymorethan0.5mm.Replaceflatspringonsensorplatestop.Adjusttozeroposition.7PossiblecauseENGINEFAILSTOSTART(coldorwarm)DiagnosisRepairprocedureFuelpressuredoesnotbuildup1.Screwcap2.Sealingwasher3.Correctiondisc4.Spring5.Piston6.O-RingENDConnectpressuregaugeP378or378a;testpressureImportant:Topreventdirtfromenteringthesystem,allconnec-tionswhichhavetoberemovedmustfirstbecleanedthoroughly.Thepressuregaugeisconnectedbetweenthefueldistributorandcontrolpressureline.Thecontrolpressurenowrunsfromthefueldistributorthroughthetwo-wayvalveofthepressureguugetothewarm-upregulatorandthrottlevalve.Allpressuretestscanbecarriedoutinthiswaywithoutreconnectingthetubes.Note:calibratepressuregaugeoccasionally.865431~1~l~~2Switchonignition,from76modeldisconnecttheairsensorcontact;two-wayvalvetoposition1.Readoffsystempressure.Nominalvalue4.5to5.2atm.I0..!!',:J,-,'~a.':J~E2~L'~SD0C~'~-0,~:J:J~.DES0V~-6Systempressurebetween4.5and5.2bar.Thepressureshouldideallybetowardstheupperlimit.PressureregulatingvalveinfueldistributorunitleakingReplacerubbersealingringinpressureregulatingvalveI,9.Defectiveauxiliaryairvalve(from75model).Coldenginestartsthenstops.Theauxiliaryairvalvemustbeopenwhentheengineisnotrunning.enginefailstostartENDCheckhoseforkinksandthattheauxiIiaryairvalveisopen.Ifnokinksinhoses,disconnecthosesfromtheauxiliaryairvalveandcheckthataircanpassthroughthevalve.ENDI11.ENGINEFAILSTOSTART(coldorwarm)PossiblecauseIDiagnosisRepairprocedureRepeatsystempressuretest.Pressureshouldideallybenearupperlimit.Itcanbeincreasedbytheadditionofcorrectiondisc-3-inthesystempressurecontrolvalve.IStartengine!IIAdjustidlingCOIEDOnvehiclespriorto75modelclampofffeedhosetocoldstartvalvewithhosecliptocutofffuelsupply.From75modelonwards,unscrewfeedhoseatcoldIColdstartdevicede-Istartvalveandclosetightly.fective;enginefloodsIICheckcoldstartvalveforleakingIstartengineII,TYPICALCOLD-STARTPROBLEMS-TestconditionsBatteryvoltagesufficientValveclearanceandmechanicalconditionofenginecorrectIgnitionsysteminorderPossiblecauseDiagnosisOperatingerrorEnginefailSllEnginetostartstartsproperlyproperly*Inform'customerofcorrectoperationENDIHandthrottlewrongly:adjustedsothatmicro-switchfaiIstofunctionCheckhandthrottleandmiero-switchadjustment*Possiblecause*.Operatingerror*.Handthrottlewronglysetsothatmicro-switchfailstofunction.Startingvalvefailstoinject.Thermo-timeswitchor*micro-switchdefective.Warm-up