Toro Groundsmaster 4300-D - Page 274

ToroElectronicController(TEC)(continued)
armaccesscovernexttothefuseblock(Figure159).UsetheInfoCenterdisplay
whencheckingtheinputsandoutputsoftheTECusedonyourmachine.
Thelogicpowerisprovidedtothecontrolleraslongasthebatterycablesare
connectedtothebattery.Circuitprotectionforthislogicpowertothecontrolleris
providedby2Afuse.
Theinputsfromthekey,neutral,parkingbrake,PTO,seat,mow/transport,
joysticklower/raise,enginespeedswitches,andpressuretransducerareall
monitoredbythecontroller.
Thecurrentoutputtothefollowingcomponentsarecontrolledbasedonthe
inputsreceivedbythecontroller.
•Mowcircuithydraulicvalvesolenoidcoils
•Liftcircuithydraulicvalvesolenoidcoils
•FuelpumpandengineECU
TheInfoCenterdisplaysamachinefaultcodeanddescriptionwhenanissue
isdetected.
TheconnectionterminalfunctionsfortheTECareshowninFigure160.Note
thatelectricalpowerforthecontrolleroutputsisprovidedthrough3connectors
(PWR2,PWR3,andPWR4)eachprotectedwitha7.5Afuse.A50pinwire
harnessconnectorattachestothecontroller.Theconnectorpinsareidentied
inFigure160.
IMPORTANT
Whentestingforwireharnesscontinuityattheconnectorforthe
TEC,ensurethatyoudonotdamagetheconnectorpinswiththe
multimetertestleads.Iftheconnectorpinsareenlargedordamaged
duringtesting,connectorrepairwillbenecessaryforproper
machineoperation.
ThemachineElectricalSchematicandWireHarnessDrawings/Diagramsin
AppendixA(pageA–1)canbeusedtoidentifypossiblecircuitproblemsbetween
thecontrollerandtheinput/outputdevices(e.g.,switchesandsolenoidcoils).
Becauseofthesolidstatecircuitrybuiltintothecontroller,thereisnomethodto
testitdirectly.Thecontrollermaybedamagedifanattemptismadetotestit
withanelectricaltestdevice(e.g.,digitalmultimeter).
IMPORTANT
Beforeperforminganyweldingonthemachine,disconnectboth
negativeandpositivebatterycablesfromthebattery,disconnect
thewireharnessconnectorfromtheTECandengineECU,and
disconnecttheterminalconnectorfromthealternator.Thiswill
preventdamagetotheelectricalsystemofyourGroundsmaster.
ElectricalSystem:TestingtheElectricalComponents
Page5–50
Groundsmaster
®
4300-D
16226SLRevC