Toro Groundsmaster 4500-D Series - Page 326

Theairheaterrelayisusedonmodels30893,30893TE,30899and30899TEto
providecurrentfortheengineairheaterusedforstartingacoldengine.When
necessary,theairheaterrelayisenergizedbytheengineECU.
Theglowrelayisusedonmodels30885and30887toprovidecurrenttothe
engineglowplugswhenenergizedbytheengineECU.
Ifmachineisequippedwithaoperatorcab,thecabpowerrelayprovidescurrent
totheoperatorcabelectricalcomponents.Thecabpowerrelayisenergized
whentheignitionswitchisintheONorSTARTposition.
TheTEC1,TEC2andoperatorcabpower(ifequipped)relaysresideinthe
powercenterbehindtheoperator’sseat(Figure203).Thestart,airheaterand
glowrelaysareattachedtotheaircleanermountbracketneartheengineECU
(Figure204).
Testing
86 87
85 30
85 86
87
30
g276021
Figure205
1.Parkmachineonalevelsurface,lowercuttingdecks,stopengine,engage
parkingbrakeandremovekeyfromtheignitionswitch.
2.Tomakesurethatmachineoperationdoesnotoccurunexpectedly,
disconnectnegative(−)cablefrombatteryandthendisconnectpositive(+)
cablefrombattery(seeBatteryService(page6–71)).
3.Locaterelaythatistobetested.
4.Disconnectwireharnessconnectorfromrelay.Removerelayfrommounting
bracketfortesting.
5.Usingamultimeter,verifythatcoilresistancebetweenterminals86and85
isapproximately72ohms.
6.Connectmultimeter(ohmssetting)leadstorelayterminals30and87.
Groundterminal86andapply+12VDCtoterminal85.Therelayshould
makeandbreakcontinuitybetweenterminals30and87as+12VDCis
appliedandremovedfromterminal85.
7.Disconnectvoltageandtestleadsfromtherelayterminals.
8.Securerelaytomountingbracketandconnectwireharnessconnectorto
relay.
9.Secureallremovedcomponentstomachine.
10.Connectpositive(+)cabletobatteryandthenconnectnegative(−)cableto
battery(seeBatteryService(page6–71)).
ElectricalSystem:ComponentTesting
Page6–44
Groundsmaster
®
4500-D/4700-D
19245SLRevA