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11
CAUSESOFFAULTS
Somecommoncausesoffaultsare:
•Loose,broken,ordisconnectedwiresorconnectors
•Failedcomponents
•Improperadjustmentorinstallationofelectricalormechanicalcomponents(examples:brakeadjustment,improper
MCORinstallation)
•Improperwiringofelectricalcomponents
Asshownabove,therearemanypossiblecausesforfaultstooccur,andthecontrollerhasaprogrammedreactionto
eachfaultthatisbasedonthefaultcurrentlydetected.Thetechnicianshouldbefamiliarwiththedetectedfaultsand
thecontroller’sreactionstofaultstoensureaproperdiagnosis.
Anexampleofapossiblemis-diagnosisofavehicleduetoafault:Ifthethree-pinspeedsensorwirehasbeen
disconnected,thecontrollerwilldetectaspeedsensorfault.Whenaspeedsensorfaultisdetected,thecontroller
respondstothefaultbylimitingthevehiclespeedto1/2ofitsnormaltopspeed.Ifthetechnicianreachesthe
conclusionthatthevehicleisrunningslowlybecausebatteriesareheavilydischarged,hehasmadeanimproper
diagnosisoftheproblem.
Thecontrollershouldbecheckedforfaultcodesbeforeanyserviceisperformed.
Afterdetectingafault,thecontrollerwillrespondinoneormoreofthefollowingways:
•A.Reducevehiclespeedtozerobyreducingarmaturecurrent
•B.Reducevehiclespeedtozerobyreducingeldcurrenttozero
•C.Turnoffthesolenoid
•D.Causethevehicletorunatslowspeed
•E.Graduallyreducethearmaturecurrentlimit
•F.Quicklyreducethearmaturecurrentuntilspeedsensorpulsesoccur
•G.Reduceeldcurrentandbeepreversebuzzeratafastrate
•H.LimitsvehiclespeedperAnti-T ampersetting
•J.Addstheoccurrencetothefaultcounter
•K.Activatesawarningdevice
•L.LocksoutPrivateSpeedMode
2019PrecedentVillager2MaintenanceandServiceManualPage11-15
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