Navistar MaxxForce 9 - Page 105

DIAGNOSTICMANUAL
Step
ActionDecision
9
Verifyexhaustgastemperaturesarewithinspecication.
UsetheplaybackfeatureinServiceMaxx™,andgraphthe
followingsignalvaluesfromstep1OBFCT:
SignalValues:
•DieselOxidationCatalystInletT emperature(DOCIT)
•DieselOxidationCatalystOutletT emperature(DOCOT)
•DieselParticulateFilterOutletT emperature(DPFOT)
•DPFSootLoad
ComparesnapshottoGraph6,7,and8page129.
Whichgraphdoessnapshotmostcloselymatch?
Graph6:Diagnosticscomplete
Graph7:ReplaceDOC.Afterrepairs
arecomplete,performanOBFCTto
verifyrepairs.
Graph8:Gotostep10
Step
ActionDecision
10
CheckOxygenSensor(O
2
S)operation.Starttheengine
andallowtoreachnormaloperatingtemperature.Using
ESTwithServiceMaxx™software,gotoSessions>
Performance.Lettheengineidlefor5minuteswhile
monitoringO
2
ST emperaturesignalvalue.
IsO
2
STemperaturesignalvaluegreaterthan1400°F
(760°C)?
Yes:Gotostep11
No:RepairO
2
Sorcircuit(See
ElectronicControlSystemsDiagnostics
inEngineDiagnosticManual).After
repairsarecomplete,retestfororiginal
problem.
Step
ActionDecision
11
VisuallyinspectAftertreatmentFuelInjector(AFI)supply
lineforleaks,kinks,bends,orotherdamage?
IstheAFIsupplylineleakingordamaged?
Yes:ReplaceAFIsupplyline.After
repairsarecomplete,gotostep13.
No:Gotostep12
101
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