OPERATION291
TheABScontrolunitcontainsaself-testingprogramthatisengagedeachtimethe
ignitionisturnedon.TheoperatorcanverifythetestingbylisteningfortheABS
modulatorvalvesactuatingtwiceinseries.Toincreasethesound,holddownthefoot
brakepedalwhentheignitionisturnedon.
IfanyoftheABStell-talescomeonduringdrivingordonotgooutafterashorttime
afterturningontheignition,takethevehicletoanauthorizedVolvoTruckdealerto
repairtheABSorbrakesystem.Thevehiclecanstillbedrivenwithaprobleminthe
ABSsystem.However,ABSwillnotbeworkingandthestandardbrakingsystem
willbeineffect.
W3005149
ABSMalfunctionTruck/Tractor
TheinstrumentclusteralsocontainsanABStell-talelamp,whichindicateswhen
thereisaproblembeingreportedbytheTrailerABSsystem.
W3005148
ABSMalfunctionTrailer
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