Navistar MaxxForce 15 - Step 1 Using Electronic Service Tool (EST) with ServiceMaxx software, check Diagnostic Trouble Code (DTC) list to determine which of the following fault codes is active: SPN 3719;3936 FMI 0, 15, or 16.

DIAGNOSTICMANUAL
3.4.SYMPTOM3(MEDIUMDUTY):SPN3719ORSPN3936ACTIVEONLYOR
FREQUENTREGENS(MORETHANONEPARKEDREGENPERDAY)
NOTE–Beforebeginningthefollowingstep-baseddiagnostics,performallvehicleoperationalchecks
page5.
NOTE–Thenumberofregensperformedinonedaymayvarydependingonapplication.Thefollowing
criteriashouldbeusedtodetermineifaregenisconsideredfrequent:
•Line-haul:Morethan1parkedregenperdayisfrequentregeneration.
•Severeservice:Morethan2parkedregensperdayisfrequentregeneration.
Step
ActionDecision
1
UsingElectronicServiceT ool(EST)withServiceMaxx™software,
checkDiagnosticTroubleCode(DTC)listtodeterminewhichof
thefollowingfaultcodesisactive:SPN3719/3936FMI0,15,or
16.
Whichfaultcodeisactive?
SPN3719orSPN3936FMI
0:Gotostep2
SPN3719orSPN3936FMI
16:Gotostep4
SPN3719orSPN3936FMI
15:Gotostep5
Step
ActionDecision
2
DothreeOnboardFilterCleanlinessT ests(OBFCT)todecrease
sootloadofDieselParticulateFilter(DPF).UsingEST,gotoTests
>KOERAftertreatmentT ests>OnboardFilterCleanlinessTest.
AfterOBFCT sarecomplete,checkDTClisttodetermineifSPN
3719FMI0droppedoneFMIleveltoSPN3719FMI16.
DidSPN3719FMI0droponeFMIleveltoSPN3719FMI16?
Yes:Gotostep3
No:Gotostep4
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