Trucks 2010Emissions ServiceManual …

1 ServiceManualTrucksGroup28 EngineControlModule(ECM),DiagnosticTroub leCode(DTC),Guide2010 EmissionsCHU,CXU,GU, , ,thisisareferencetoaLaborCode(StandardTi me).Serviceprocedureswhichdonotincludean operationnumberinthetitleareforgeneralin formationandnoreferenceismadetoaLaborCod e(StandardTime). , ,cautionsandwarningsareusedinthisService Documentation:Note:Indicatesaprocedure,p ractice, , ,NCUSAO rdernumber:PV776-88961816 Repl: 2010 MackTrucks,Inc.,Greensboro, ,storedinretrievalsystem,ortransmittedin anyformsbyanymeans,electronic,mechanical ,photocopying,recordingorotherwise,witho utthepriorwrittenpermissionofMackTrucks, (ECM).

2 3 OnBoardDiagnostic(OBD) (ECM)DiagnosticTroubleCodes(DTCs)..2212 Group28 EngineControlModule(ECM)DesignandFunctio nEngineControlModule(ECM) .Note:Theuseofascantoolisnecessarytoperf ormdiagnosticworkaswellasclearingofanydi agnostictroublecodes(DTCs).DTC(s) (ECUs)areused;theenginecontrolmodule(ECM ),instrumentcontrolmodule(ICM),VehicleEl ectronicControlUnit(VECU),transmissionco ntrolmodule(TCM),thegearselectorcontrolm odule(GSCM)andtheaftertreatmentcontrolmo dule(ACM).Together,thesemodulesoperatean dcommunicatethroughtheSAEJ1939(CAN1) ,fanoperation,engineprotectionfunctions, enginebrakeoperation,theexhaustgasrecirc ulation(EGR) , , ,themoduleshaveonboarddiagnostic(OBD) ,thefaultwillbeloggedinoneorbothofthemod ules memory,thevehicleoperatorwillbeadvisedth atafaulthasoccurredbyilluminationamalfun ctionindicatorlamp(MIL)andamessageinthed riverinformationdisplay, ,thesystemwillentera"derate" , (DTCs)

3 Loggedinthesystemmemorycanlaterberead,to aidindiagnosingtheproblemusingadiagnosti ccomputerorthroughtheinstrumentclusterdi splay, , (DTCs).DTC(s) , ,diagnosticfaultlogging, ,enginebrakesolenoid,EGRvalve,turbocharg ernozzleposition, ,thebroadcastofdatabetweenmodulesalsoinc ludesvariouscalculationsandconclusionsth ateachmodulehasdeveloped, (OBD)MonitorsOnBoardDiagnostic(OBD)Monit orsSystemElectronicControlUnit(ECU)Overv iewTheenginecontrolmodule(ECM)monitorsan dmodels(usingphysicalprinciples)enginepa rameterstomonitortheenginesystem emissioncritical ECUsthataremonitored.

4 EngineControlModule(ECM) VehicleElectronicControlUnit(VECU) AftertreatmentControlModule(ACM) AftertreatmentNitrogenOxides(NOx)Sensors EngineVariableGeometryTurbocharger(VGT)S martRemoteActuator(SRA) (CAN1)datalinkwhiletheothersusetheSAEJ19 39-7(CAN2) , (DTCs).DTC(s) (ICM),TransmissionControlModule(TCM)andA nti-lockBrakeSystem(ABS)Modulethatprovid edatatotheemissioncontrolsystemorthediag nosticsystembutarenot emissioncritical .MalfunctionIndicatorLamp(MIL), emissioncritical (OBD)MonitorsSystemsMonitoringInformatio nSectionContent AcceleratorPedalPosition(APP)Sensor,Over view ,page6 Active/intrusiveInjection(Aftertreatment HydrocarbonDoserClogging) ,page6 AftertreatmentDieselExhaustFluid(DEF)Fee dbackControl ,page6 AftertreatmentDieselExhaustFluid(DEF)Qua lity ,page6 AftertreatmentDieselParticulateFilter(DP F) ,page6 AftertreatmentDieselParticulateFilter(DP F)

5 RegenerationFrequency ,page6 AftertreatmentDieselParticulateFilter(DP F)IncompleteRegeneration ,page6 AftertreatmentDieselParticulateFilter(DP F)RegenerationFeedbackControl ,page6 AftertreatmentFuelSystem,RationalityMoni tors ,page7 AftertreatmentNon-MethaneHydroCarbons(NM HC)Catalyst ,page7 AftertreatmentNitrogenOxides(NOx)Sensor( s)Overview ,page7 AftertreatmentSelectiveCatalyticReductio n(SCR) ,page7 AftertreatmentSelectiveCatalyticReductio n(SCR)ConversionEfficiency ,page7 AmbientAirTemperature(AAT)Sensor,Overvie w ,page7 ChargeAirCooler(CAC) ,page8 CombinedMonitoring ,page8 CrankcaseVentilation ,page8 CrankcaseVentilationDiagnosticFunction ,page8 EngineControlModule(ECM),RationalityMoni tors ,page8 EngineCoolantTemperature(ECT)SensorOverv iew ,page8 ExhaustGasRecirculation(EGR) ,page8 ExhaustGasRecirculation(EGR)LowFlow ,page8 ExhaustGasRecirculation(EGR)HighFlow ,page8 ExhaustGasRecirculation(EGR)

6 SlowResponse ,page9 ExhaustGasRecirculation(EGR)FeedbackCont rol ,page9 ExhaustGasRecirculation(EGR)CoolerPerfor mance ,page9 Exotherm ,page9 FilteringPerformance ,page9 FuelSystem ,page9 IdleSpeed,RationalityMonitors ,page9 IntakeManifoldPressure(IMP)ControlSystem ,page9 Misfire ,page10 MissingSubstrate ,page10 Over-boost ,page10 ParkingBrakeSwitch,Overview ,page10 PowerTake-off(PTO)EnableSwitch,Overview ,page10 SAEJ1939(CAN1)DataLink,Overview ,page10 ThermostatMonitor ,page10 Time/DateOverview ,page10 VariableGeometryTurbocharger(VGT)Feedbac kControl ,page10 VehicleSpeedSensor(VSS),Overview ,page11 Under-boost ,page11 VariableGeometryTurbocharger(VGT)SlowRes ponse ,page115 Group28 OnBoardDiagnostic(OBD)MonitorsAccelerato rPedalPosition(APP)Sensor,OverviewTheAPP sensorinputisananalogvoltagesignalpropor tionaltothepedalpositionthatisreadbythev ehicleelectroniccontrolunit(VECU).

7 (valueof0-100%),isdirectlyproportionalto thepedal (On/Off)generatedbyanidlevalidation(IV) (AftertreatmentHydrocarbonDoserClogging) Thisdiagnosticisbasedonthecheckingtheaft ertreatmentdieselparticulatefilter(DPF) (DEF) (NOx) (NH3)bufferintheaftertreatmentselectivec atalyticreduction(SCR).AftertreatmentDie selExhaustFluid(DEF) , (DPF) , (DPF)RegenerationFrequencyThisfunctionde tectsiftheaftertreatmentDPFregenerationf requencyincreasestoalevelthatitwouldcaus ethenon-methanehydrocarbon(NMHC) (DPF) , , (DPF)RegenerationFeedbackControlThisfunc tionmonitorstheparticulatematterregenera tionfeedbackcontrolanddetects.

8 Ifthesystemfailstobeginfeedbackcontrol Ifafailureordeteriorationcausesopenloop Ifthefeedbackcontrolhasusedupalloftheall owedadjustmentWhentheaftertreatmenthydro carbondoserisused, (OBD)MonitorsAftertreatmentFuelSystem,Ra tionalityMonitorsTheaftertreatmentfuelsy stemconsistsofaaftertreatmentfuelshutoff valve,aseparateaftertreatmenthydrocarbon doser(injector), , AftertreatmentFuelPressureSensor,Circuit Monitors ,page16, AftertreatmentFuelShutoffValve,CircuitMo nitors ,page16or AftertreatmentHydrocarbonDoser,CircuitMo nitors , (NMHC)CatalystTodetectwhenthehydrocarbon conversionfailsintheaftertreatmentdiesel oxidationcatalyst(DOC), (dutycycle) (NOx)Sensor(s)OverviewTheNOxsensorsconsi stof: Housingholdingthesensingelement.

9 Anelectroniccontrolunit(ECU),interfacing thesensorandtheenginecontrolmodule(ECM). Awire, ,onebeforeandoneaftertheaftertreatmentse lectivecatalyticreduction(SCR) , Badsignalquality Removedsensor MissingsignalCircuitintegrityoftheaftert reatmentNOxsensorischeckedbythesensorits elfandthestatusistransmittedtotheenginec ontrolmodule(ECM) , opencircuit highvoltage circuitloworhighAftertreatmentSelectiveC atalyticReduction(SCR)TheaftertreatmentS CRsystemisacatalystsystemthatisusedtored uceexhaustNitrogenOxides(NOx) (DEF)(aureasolution) ,convertsNOxtonitrogenoxide(NO)andwater( H2O).

10 Theaftertreatmentcontrolmodule(ACM)isuse dtocontroltheaftertreatmentSCRcomponents andrelayssysteminformationtotheEngineCon trolModule(ECM). (SCR)ConversionEfficiencyTheaftertreatme ntSCRcatalystdiagnosiscalculatesthelowte mperatureperformanceoftheaftertreatmentS CRsystemandcomparesittotheperformancewhe nthecatalystiswarmenoughtoreachhighnitro genoxides(NOx) (AAT)Sensor, (VECU) (ECM).7 Group28 OnBoardDiagnostic(OBD)MonitorsChargeAirC ooler(CAC)ThenominalCACefficiencyisamapb asedonmassairflow(MAF)andambientairtempe rature(AAT).