1DIAGNOSTICTROUBLESHOOTINGPROCEDURES27
Step1Performpreliminaryoperationalcheckoutprocedure.Decision
Didyouperform1.0PreliminaryVehicleOperationalCheckoutProcedure?Yes:GotoStep2.
No:Goto1.0Preliminary
VehicleOperational
CheckoutProcedure
(page23).
Step2Determineifinjectorbuzztestwillidentifyafailedinjector.Decision
PerformInjector(Buzz)Test(page2154).
Isanaudiblebuzzsoundheardfromeachinjector?
Yes:GotoStep3.
No:Doinjectorcircuit
diagnostics(SPN
651-656FMI4,5;SPN
2797,2798FMI3,4;
SPN3659-3664FMI
4,5)forspecicfailed
injector(s).Ifcircuit
diagnosticspasses,
replacefailedinjector(s).
Step3CheckfornostartrelatedDiagnosticTroubleCodes(DTC).Decision
Yes:GotoFaultCode
Diagnosticsfornostart
relatedSPN.
UsingElectronicServiceTool(EST)withServiceMaxx™software,checkDTClistfor:
•SPN94FuelDeliveryPressure(FDP)
•SPN931ElectricFuelPump(EFP)
•SPN164,3055InjectionControlPressure(ICP)
•SPN679InjectionPressureRegulator(IPR)
•SPN636CamshaftPosition(CMP)
•SPN637CrankshaftPosition(CKP)
•SPN108,158,628,629,1136,1387EngineControlModule(ECM)
•SPN27,2791ExhaustGasRecirculation(EGR)
•SPN110,1659EngineCoolantT emperature1(ECT1)
•SPN175EngineOilT emperature(EOT)
•SPN51,3464,EngineThrottleValve(ETV)
•SPN651-656,2797,2798,3055,3659-3664,4257Injector(INJ)faults
•SPN4287EngineCompressionBrakePressure(ECBP)
DoesESTDTClisthaveanyactivefaultcodeslistedabove?
No:GotoStep4.
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