Navistar N9 - Engine Running, Engine Not under Load Operational Checkout Procedure

341DIAGNOSTICTROUBLESHOOTINGPROCEDURES
4.0-EngineRunning,EngineNotUnderLoadOperationalCheckoutProcedure
Overview
Thefollowingstepsdirecttechnicianstosystematicallytroubleshootenginerunningproblemswhileengineis
notunderaload.
Step1Performpreliminaryoperationalcheckoutprocedure.Decision
DidyouPerform1.0PreliminaryVehicleOperationalCheckoutProcedure
(page23)?
Yes:GotoStep2.
No:Goto1.0Preliminary
VehicleOperational
CheckoutProcedure(page
23).
Step2CheckforrelatedDiagnosticTroubleCodes(DTCs).Decision
Yes:GotoFault
CodeDiagnosticsfor
appropriateSPN.
UsingElectronicServiceTool(EST)withServiceMaxx™software,checkDTClistfor:
•SPN91,2623AcceleratorPedalPosition(APP)
•SPN94FuelDeliveryPressure(FDP)
•SPN931ElectronicFuelPump(EFP)
•SPN164,3055InjectionControlPressure(ICP)
•SPN679InjectionPressureRegulator(IPR)
•SPN636CamshaftPosition(CMP)
•SPN637CrankshaftPosition(CKP)
•SPN27,2791ExhaustGasRecirculation(EGR)
•SPN110,1659EngineCoolantT emperature1(ECT1)
•SPN175EngineOilT emperature(EOT)
•SPN1209ExhaustBackPressure(EBP)
•SPN3610DieselParticulateFilterOutletPressure(DPFOP)
•SPN5541,5543ExhaustBackPressureValve(EBPV)
•SPN3251DieselParticulateFilterDifferentialPressure(DPFDP)
•SPN51,3464EngineThrottleValve(ETV)
•SPN102IntakeManifoldPressure(IMP)
•SPN132MassAirFlow(MAF)
•SPN651-656,2797,2798,3055,3659-3664,4257Injector(INJ)
•SPN105IntakeManifoldTemperature(IMT)
DoesESTDTClisthaveanyoftheabovelistedSPN?
No:GotoStep3.