Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
10
Verifyexhaustgastemperaturesarewithinspecication.
UsetheplaybackfeatureinServiceMaxx™,andgraph
thefollowingsignalvaluesfromstep2OBFCT:
SignalValues:
•DieselOxidationCatalystInletT emperature(DOCIT)
•DieselOxidationCatalystOutletT emperature
(DOCOT)
•DieselParticulateFilterOutletTemperature(DPFOT)
•DPFSootLoad
ComparesnapshottoGraph6,7,and8page129.
Whichgraphdoessnapshotmostcloselymatch?
Graph6:Diagnosticscomplete
Graph7:ReplaceDOC.Afterrepairsare
complete,performanOBFCTtoverify
repairs.
Graph8:Gotostep11
Step
ActionDecision
11
CheckOxygenSensor(O
2
S)operation.Starttheengine
andallowtoreachnormaloperatingtemperature.Using
ESTwithServiceMaxx™software,gotoSessions>
Performance.Lettheengineidlefor5minuteswhile
monitoringO
2
ST emperaturesignalvalue.
IsO
2
ST emperaturesignalvaluegreaterthan1400°F
(760°C)?
Yes:Gotostep12
No:RepairO
2
Sorcircuit(SeeElectronic
ControlSystemsDiagnosticsinEngine
DiagnosticManual).Afterrepairsare
complete,retestfororiginalproblem.
Step
ActionDecision
12
VisuallyinspectAftertreatmentFuelInjector(AFI)supply
lineforleaks,kinks,bends,orotherdamage?
IstheAFIsupplylineleakingordamaged?
Yes:ReplaceAFIsupplyline.After
repairsarecomplete,gotostep14.
No:Gotostep13
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