Navistar MaxxForce 15 - 10.3. GRAPH 3: LUG DOWN TEST (ENGINE SPEED, FRP, AND FRPD); Graph Analysis:

DIAGNOSTICMANUAL
MAXXFORCE
®
11,13AND15SERVICEMAXX™SNAPSHOTS
10.1.GRAPH1:AIRMANAGEMENTSYSTEMTEST(GOOD)
NOTE–Colorsinthegraphsareusedforclarityonlyandwillnotnecessarilymatchthecolorsyouwill
seeinyourServiceMaxx™snapshots
1.Enginespeed(rpm)[Green]
2.IntakeManifoldPressure(IMP)
(psi)[Orange]
3.Turbocharger2WastegateControl
(TC2WC)(percent)[Blue]
Figure26Graph1:AirManagementSystemTest(Good)
GraphAnalysis:
ThisgraphshowsnormaloperationoftheAirManagementSystem(AMS)duringtheAirManagementTest
(AMT).TheAMTdoesnotgivepassorfailresults.ItonlyallowstheusertovalidatetheAMSbymonitoring
theeffectseachactuatorhasonIntakeManifoldPressure(IMP).IMPisnormallybetween8psi(55kPa)to13
psi(90kPa)onenginerampupduringAMT .IfTurbocharger2WastegateControl(TC2WC)isnotoperatingas
designed,boostpressurewillnotrespondtochangesinengineload.Excesssootwillthenbegeneratedby
theenginecausingfrequentregenerationoftheaftertreatmentsystem.
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