301DIAGNOSTICTROUBLESHOOTINGPROCEDURES
3.0-EngineHardtoStartOperationalCheckoutProcedure
Overview
Thefollowingstepsdirecttechnicianstosystematicallytroubleshootenginehardtostartconditionsandtoavoid
unnecessaryrepairs.
Step1Performpreliminaryoperationalcheckoutprocedure.Decision
Didyouperform1.0PreliminaryVehicleOperationalCheckoutProcedure?Yes:GotoStep2.
No:Goto1.0Preliminary
VehicleOperational
CheckoutProcedure
(page23).
Step2CheckforhardtostartrelatedDiagnosticTroubleCodes(DTC).Decision
UsingElectronicServiceT ool(EST)withServiceMaxx™software,checkDTC
listfor:
•SPN94FuelDeliveryPressure(FDP)
•SPN931ElectricFuelPump(EFP)
•SPN164InjectionControlPressure(ICP)
•SPN679InjectionPressureRegulator(IPR)
•SPN636CamshaftPosition(CMP)
•SPN637CrankshaftPosition(CKP)
•SPN108,158,628,629,1136,1387EngineControlModule(ECM)
•SPN27,2791ExhaustGasRecirculation(EGR)
•SPN110,1659EngineCoolantT emperature1(ECT1)
•SPN175EngineOilT emperature(EOT)
•SPN1209ExhaustBackPressure(EBP)
•SPN3251DieselParticulateFilterDifferentialPressure(DPFDP)
•SPN5541,5543ExhaustBackPressureValve(EBPV)
•SPN51,3464EngineThrottleValve(ETV)
•SPN102IntakeManifoldPressure(IMP)
•SPN132MassAirFlow(MAF)
•SPN651-656,2797,2798,3055,3659-3664,4257Injector(INJ)faults
•SPN4287EngineCompressionBrakePressure(ECBP)
DoesESTDTClisthaveanyofthefaultcodeslistedabove?
Yes:GotoFaultCode
Diagnostics(page142)
forhardtostartrelated
SPN.
No:GotoStep3.
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