Navistar MaxxForce 9 - Check Parked Regen Inhibitors

DIAGNOSTICMANUAL
Table183CheckParkedRegenInhibitors
1.TurnignitionswitchON,engineOFF .
2.UsingESTwithServiceMaxx™software,loadtheAftertreatmentsession.
3.VerifyalllistedInhibitorsaredisplayingNotInhibited.
Checks
ExpectedResults
Comment
AFTRegenInhibitstatusNotInhibited
Ifinhibited,correctthecause.Checkswitchesandany
DTCthatmaybecausingtheRegeninhibit.
RedStopAlertlampOffIfOn,Regencan'tberun.Gotoappropriateaftertreatment
systemdiagnosticssectioninthismanual.
Regeninhibitswitch
OffIfOn,turnswitchOff.IfswitchdoesnotturnOff,then
diagnosecircuitfault.
PTOenableswitchOffIfOn,turnswitchOff.IfswitchdoesnotturnOff,then
diagnosecircuitfault.
PTOswitchOffIfOn,turnswitchOff.IfswitchdoesnotturnOff,then
diagnosecircuitfault.
Parkingbrakeswitch
OnIfOff,setparkingbrake,ifswitchdoesnotturnOn,then
diagnosecircuitfault.
BrakePedalswitch
OffIfOnandfootisoffpedal,thendiagnosecircuitfault.
AcceleratorPedal
Position
0%Ifabove0%,andfootisoffpedal,thendiagnosecircuit
fault.
ClutchPedalSwitchOffIfOnandfootisoffpedal,thendiagnosecircuitfault.
TransmissionPositionParkorNeutral
Ifengaged,disengage,ordiagnosecircuitfault.
IfnoinhibitorsandaRegenisneeded,gotothefollowingParkedRegenChecks.
ParkedRegenChecks
DuringaParkedRegentheenginespeedwillrampupto1200-1800rpm.
Typicalreadings:
•ETV:80%(closed).
•EGRPosition:0%(closed)
•DOCIT:482-572°F(250-300°C)
•DOCOT:1112-1202°F(600–650°C)(after5-10minutes)
•DPFOT:1022-1112°F(550–600°C)(after10-15minutes)
•DPFDP:DecreasingsteadilyonceDPFITandDPFOTaresteadyandabove1022°F(550°C).
UsingESTwithServiceMaxx™software,opentheAftertreatmentsession.StartaParkedRegenand
monitorsignals.
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