Navistar MaxxForce 15 - Step 1 Using Electronic Service Tool (EST) with ServiceMaxx software, check Diagnostic Trouble Code (DTC) list for active fault code(s) other than SPN 3719 (DPF soot load).

DIAGNOSTICMANUAL
3.5.SYMPTOM4(MEDIUMDUTY):SPN3719ORSPN3936ANDOTHERACTIVE
FAULTCODES
NOTE–Beforebeginningthefollowingstep-baseddiagnostics,performallvehicleoperationalchecks
page5.
Step
ActionDecision
1
UsingElectronicServiceT ool(EST)withServiceMaxx™software,
checkDiagnosticTroubleCode(DTC)listforactivefaultcode(s)other
thanSPN3719(DPFsootload).
Arefaultcode(s)otherthanSPN3719orSPN3936active?
Yes:Repairotheractive
faultcode(s)(SeeElectronic
ControlSystemsDiagnostics
inEngineDiagnostic
Manual).Afterrepairs
arecomplete,gotostep2.
No:Gotostep2
Step
ActionDecision
2
UsingElectronicServiceT ool(EST)withServiceMaxx™software,
checkDiagnosticTroubleCode(DTC)listtodeterminewhichofthe
followingfaultcodesisactive:SPN3719FMI0,15,or16.
Whichfaultcodeisactive?
SPN3719orSPN3936FMI
0:Gotostep3
SPN3719orSPN3936FMI
16:Gotostep5
SPN3719orSPN3936FMI
15:Gotostep6
Step
ActionDecision
3
DothreeOnboardFilterCleanlinessT ests(OBFCT)todecrease
sootloadofDieselParticulateFilter(DPF).UsingEST ,gotoTests>
KOERAftertreatmentT ests>OnboardFilterCleanlinessT est.After
OBFCTsarecomplete,checkDTClisttodetermineifSPN3719FMI
0droppedoneFMIleveltoSPN3719FMI16.
DidSPN3719FMI0droponeFMIleveltoSPN3719FMI16?
Yes:Gotostep5
No:Gotostep4
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