Toro Groundmaster Series - Page 238

totheenginestartersolenoidandtheenginefuelsolenoidviathedelaytimer.
Formodel31902and31903machines,thestartinterlockrelaysendspower
totheengineECU.ThestartinterlockrelayisenergizedbytheTDM.
•TheExhaustGasRecirculation(EGR)relayisusedtoprovidecurrentto
theengineEGRvalve(models31902and31903only).TheEGRrelayis
energizedbytheYanmarengineECU.
•Thestartrelaysuppliespowertotheenginestarter(models31902and31903
only).ThestartrelayisenergizedbytheYanmarengineECU.
•TheACcondenserfansrelayprovidescurrenttobothofthecondenserfans
andtheACclutchrelay(models31903and31909only).TheACcondenser
fansrelayisenergizedbytheairconditioningsystemthermostat.
•TheACswitchsignalrelayispartofthestandardcabrooftopharness,butis
notusedonGroundsmaster3310machines.
•TheACclutchrelayandtheACcondenserfansrelaymustbeenergizedto
engagethecompressorclutch(models31903and31909only).TheAC
clutchrelayisenergizedbythethermostataslongastheminimumAC
systempressureexists(ACpressureswitchclosed).
TestingRelayswith5Terminals
RefertoFigure93forthisprocedure.
1.Parkthemachineonalevelsurface,lowerthecuttingunit(orattachment),
engagetheparkingbrake,setthekeyswitchtotheOFFpositionandremove
thekeyfromthekeyswitch.
2.Disconnectthegroundcableatthebattery;refertoRemovingandInstalling
theBattery(page6–64).
3.Removetheoperator’sconsolecovers;refertoRemovingandInstallingthe
Operator’sConsoleCovers(page7–23).
4.Locatetherelaythatistobetestedanddisconnectthewireharness
connectorsfromtherelay.Checktherelayandtheharnessconnectorfor
damageorcorrosionandcleanorrepairifnecessary.
g256780
Figure98
Relaywith5terminals
ElectricalSystem:TestingtheElectricalComponents
Page6–46
Groundsmaster
®
3200,3300and3310
19240SLRevA