Navistar N10

421DIAGNOSTICTROUBLESHOOTINGPROCEDURES
10.0-SCRAftertreatmentOperationalCheckoutProcedure
Overview
ThefollowingstepsdirecttechnicianstosystematicallytroubleshootSelectiveCatalystReduction(SCR)exhaust
aftertreatmentsystemproblemsandavoidunnecessaryrepairs.
CAUTION:ThefollowingserviceinformationONLYappliestoN9andN10engineswithSCRaftertreatment
systems.Usingthesediagnosticsforanyotherengineoraftertreatmentsystemwillresultinmisdiagnosisand
unnecessaryrepairs.
TestProcedure
Step1Performpreliminaryoperationalcheckoutprocedure.Decision
Didyouperform1.0PreliminaryVehicleOperationalCheckoutProcedure?Yes:GotoStep2(page
42).
No:Goto1.0Preliminary
VehicleOperational
CheckoutProcedure
(page23).
Step2Determineifparkedregenerationwillnotactivate.Decision
PressParkedRegenSwitch.
Doesexhaustaftertreatmentregenerationstart?
Yes:Pressbrakepedal
toabortParkedRegen.
GotoStep3(page42).
No:Goto10.1Parked
RegenWillNotActivate
(page131).
Step3Determineifexcessiveblacksmokecomesoutofexhaust.Decision
Doesexcessiveblacksmokecomeoutofexhaust?Yes:Goto10.2Black
Smoke(page133).
No:GotoStep4(page
42)
Step4Determineifexcessivewhitesmokecomesoutofexhaust.Decision
Doesexcessivewhitesmokecomeoutofexhaust?Yes:Goto10.3White
Smoke(page138).
No:Reviewoperator
complaint.