Navistar MaxxForce 15 - Step 3 Diesel Particulate Filter (DPF) Snap Acceleration Test (Quick Test).

DIAGNOSTICMANUAL
Step
ActionDecision
3
DieselParticulateFilter(DPF)SnapAccelerationTest(Quick
Test).ThisprocedurecheckstheDPFforcracksorinternal
damagewithoutremovingtheDPFfromthevehicleandisused
totestbasicfunctionalityoftheDPF .Thisistobedonepriorto
removingtheDPF .
1.Thetransmissionmustbeinneutralandthe
parkingbrakeapplied.
2.Startandidletheengine.
3.Rapidlysnaptheacceleratorpedalfromidletofull
throttle.Thiscanbeperformedmultipletimes.
4.Duringtheengineaccelerations,visuallycheckfor
aheavyblacksmokeexitingtheexhaustpipe.
Isblacksmokevisible?
Yes:GotoSymptom5(Heavy
Duty):Blacksmokepage113.
No:GotoSymptom1(HeavyDuty):
FrequentParkedRegenswithNo
ActiveCodes(Morethanoneparked
regenperday)page83.
Step
ActionDecision
4
UsingElectronicServiceT ool(EST)withServiceMaxx™
software,checkDiagnosticTroubleCode(DTC)listforengine
overspeedfaultcode(s).
Areengineoverspeedfaultcode(s)active?
Yes:Repairengineoverspeedfault
code(s)(SeeElectronicControl
SystemsDiagnosticsinEngine
DiagnosticManual).Afterrepairs
arecomplete,gotostep5.
No:Gotostep5
Step
ActionDecision
5
Checkforanenginenostart.TurnignitionswitchtoONposition
andcrankengineforamaximumof20seconds.Ifengine
doesnotstart,wait2to3minutesandcrankengineagainfora
maximumof20seconds.
Doestheenginestartandrun?
Yes:Gotostep6
No:GotoSymptom2(HeavyDuty):
EngineNoStart/StartsandStalls
page91.
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