Navistar MaxxForce 9

DIAGNOSTICMANUAL
4.3.GRAPH3:0TO60MPHTEST(ICPDESIREDANDICP)
1.InjectionPressureRegulator(IPR)
valvecontrol(percent)[Blue]
2.InjectionControlPressureDesired
(ICPD)[Green]
3.Enginespeed(rpm)[Orange]
4.InjectionControlPressure(ICP)
[Purple]
Figure7Graph3:0to60MPHTest(ICPDesiredandICP)
GraphAnalysis
ThisgraphshowsanInjectionControlPressure(ICP)systemoperatingasdesigned.Thistestdoesnotgive
passorfailresults.ItonlyallowstheusertovalidateICPandInjectionControlPressureDesired(ICPD)signal
valuesunderload.Asenginerpmincreases,ICPshouldsteadilyincrease.LowICPwillcauselowIntake
ManifoldPressure(IMP).DiagnoselowICPconcernsbeforediagnosinglowIMPconcerns.
Actions
1.VerifyICPiswithin150psi(1,034kPa)ofICPDsignalvalueduringacceleration.
2.VerifyInjectionPressureRegulator(IPR)valvecontrolislessthan75%.
NOTE–Analyze0to60MPHTestsignalvaluesonlyduringacceleration,andnotdecelerationorshifting.
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