Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
Step
ActionDecision
6
Determinerootcauseofexhaustsystemcontamination.(See
EngineSymptomsDiagnosticssectioninEngineDiagnostic
Manual.)
Afterrepairsarecomplete,goto
step7
Step
ActionDecision
7
CheckOxygenSensor(O
2
S)operation.Starttheengineand
allowtoreachnormaloperatingtemperature.UsingESTwith
ServiceMaxx™software,gotoSessions>Performance.Let
theengineidlefor5minuteswhilemonitoringO
2
STemperature
signalvalue.
IsO
2
STemperaturesignalvaluegreaterthan1400°F(760°C)?
Yes:Gotostep8
No:RepairO
2
Sorcircuit(See
ElectronicControlSystems
DiagnosticsinEngineDiagnostic
Manual).Afterrepairsarecomplete,
retestfororiginalproblem.
Step
ActionDecision
8
VisuallyinspectAftertreatmentFuelInjector(AFI)supplyline
forleaks,kinks,bends,orotherdamage?
IstheAFIsupplylineleakingordamaged?
Yes:ReplaceAFIsupplyline.After
repairsarecomplete,gotostep10.
No:Gotostep9
87
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English