Toro 74090 Software Guide

FormNo.3433-858RevA

HorizonControlModule

For96inAirCoolZMaster®ProfessionalRidingMower

ModelNo.74090—SerialNo.400000000andUp

SoftwareGuide

Readthisinformationcarefullytolearnhowtooperateandmaintainyourproductproperlyandtoavoidinjury
andproductdamage.Youareresponsibleforoperatingtheproductproperlyandsafely.ReadyourOperator’s
Manualformoreinformation.

ScreenIcons

Theinformationscreenusesthefollowingicons:

GaugeandMetersProcessing

AdvancedSettingsLanguage

MaintenanceandServiceBatteryVoltage

FuelLevelEngineHours

PTOCancel/Exit

©2019—TheT oro®Company
8111LyndaleAvenueSouth
Bloomington,MN55420

Registeratwww.Toro.com.

OriginalInstructions(EN)

PrintedintheUSA

AllRightsReserved

*3433-858*A

ParkingbrakeToggleBetweenScreens

NeutralLock

*LocatedintoprowoftheInformationScreen

OperatorPresenceControl(OPC)Previous

MaximumEngineSpeedNext

EfcientEngineSpeedReset

Enter/Return

LowEngineSpeedPlay/Start

TransmissionOilMaintenancePause/Stop

2

EngineOilTemperatureIncrease

EngineOilMaintenanceDecrease

No

ProductOverview

1.LDU(LogicDisplayUnit)

2.MCU(MasterControlUnit)

Yes

Figure1

3.Audiblealarm

*Locatedonbottomrowofsomemenuscreens

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Figure2

LDU(LogicDisplayUnit)

1.Screen

2.LEDstatuslight

3

3.Buttons

Screen

EngineScreens

Thescreendisplaysiconsandinformationrelativeto
machineoperationandisbacklitforviewinginlowlight
situations.Thescreenislocatedabovethebuttons.

RefertotheScreenIcons(page1)sectionforicon
descriptions.

LEDStatusLight

TheLEDstatuslightismulti-coloredtoindicatethe
systemstatusandislocatedontherightsideofthe
panel.Duringstartup,theLEDilluminatesredto
orangetogreentoverifyfunctionality.

•SolidGreen:indicatesnormaloperatingactivity

•BlinkingRed:indicatesthatafaultisactive

•BlinkingGreenandOrange:indicatesthata

clutchresetisrequired

Buttons

Themulti-functionalbuttonsarelocatedatthebottom
ofthepanel.Theiconsdisplayedontheinformation
screenabovethebuttonsindicatethecurrentfunction.
Thebuttonsallowyoutoselecttheenginespeedand
navigatethroughsystemmenus.

Alarm

Engine-OffScreen

Whenthekeyisonwithouttheenginerunning,the
Engine-Offscreendisplays(Figure3).

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Figure3

1.Hoursremaininguntiltransmissionoilmaintenanceis
required

2.Batteryvoltagedisplay

3.Safetyinterlockstatusindicators

4.Fuel-levelgauge(iffuelsenderisavailable)

5.Screentogglesbetweenhoursremaininguntilengineoil
maintenanceandnon-resettableenginehourcounter

Engine-OnScreen

Whentheengineisrunning,theEngine-Onscreen
displays(Figure4).

Ifanerroroccurs,anerrormessagedisplays,theLED
turnsred,andthealarmsoundsaudiblyasfollows:

•Afastchirpsoundindicatescriticalerrors.

•Aslowchirpingsoundindicateslesscriticalerrors,

suchasrequiredmaintenanceorserviceintervals.

Note:Duringstartup,thealarmsoundsbrieyto

verifyfunctionality.

InformationScreens

Themaininformationscreensareasfollows:

•StartupScreen(page4)

•Engine-OffScreen(page4)

•Engine-OnScreen(page4)

StartupScreen

Duringstartup,thescreendisplaysastartupgraphic
for1second,soundsthealarm,andilluminatesthe
LED,changingfromredtoorangetogreen.

Figure4

1.Enginespeedmode4.Enginespeed

2.Safetyinterlockstatus
indicators

3.Enginetemperature

5.Fuellevelgauge(iffuel

g257021

senderisavailable)

4

EngineSpeedMode

3modesareavailable:LOW,EFFICIENT,andMAXIMUM.

•LOW:Lowtransportspeed/Lowidleforreducing

deckpackinginwetmowingconditions.

•EFFICIENT:Mediumtransportspeedandmaximum

fueleconomyandnormalmowingconditions.

•MAX:Maximumtransportspeed/Highidlefor

extrememowingconditions.

Thepanelilluminatesshowingthecurrentengine
speedmode(LowisselectedinFigure4).

SafetyInterlockStatusIndicators

Theseilluminatewheneachcontrolisinthestarting
position(i.e.,PTOdisengaged,parkingbrake
engaged,motion-controlleversintheNEUTRAL-LOCK
position,andtheoperatorispresent).

•ThePTOmustbedisengaged,brakeengaged,

andmotion-controlleversout(NEUTRAL-LOCK
position)tostarttheengine.(Youdonotneedto
beintheseattostarttheengine.)

Note:ThestartercrankswiththePTOswitchin

theON(pulledup)position;however,thesystem
disengagesthePTOandaPTOreseterroroccurs.
EngagingthePTOrequiresyoutoresetthePTO
switchbyturningitOFF(pusheddown)andON.

•YoumustbeintheseatwhilethePTOisengaged,

theparkingbrakemustbedisengaged,orthe
motion-controlleversmustbemovedinward;
otherwise,theengineshutsoff.

•Theengineshutsoffifeithertheleft,theright,

orbothleversaremovedfromNEUTRAL-LOCK
positionwhiletheparkingbrakeisengaged.

Note:RefertothemachineOperator’sManualto

checkthesafetyinterlocksystem.

MenuSelectionScreen

TheMenuSelectionScreendisplayswhenyouplace
themotion-controlleversintheNEUTRAL-LOCKposition
andpressandholdthe2outsideLDUbuttons.

Figure5

1.Outsidebuttons

TheMenuSelectionScreenallowsyoutocycle
throughthedifferentmenuoptionsbypressingthe
togglebutton.Whenthedesiredmenuoptionis
highlighted,presstheenterbuttontoselectit.

Note:Allmenuoptionsarelockedifthe

motion-controlleversarenotintheNEUTRAL-LOCK
position.

Pressandholdthe2outsidebuttonstoreturntothe
defaultscreen.

Themenuselectionscreenallowsyoutocycle
throughthefollowingscreens.

2.Menuselectionscreen

g228165

EngineTemperature

Abargraphdisplaystheenginetemperature.When
thetemperatureishighandapproachinganoverheat
condition,thebargraphashes.Whentheengine
hasoverheated,thebargraphllscompletely.

EngineSpeed

Displaysthespeedoftheengine.

FuelLevel(iffuelsenderisavailable)

Thefuellevelisshownonabardisplay .Anerror
appearswhenthefuellevelislow(approximately1
gallonremaininginthetank).

•MaintenanceandServiceMenu(page6)

•GaugesandMetersMenu(page8)

•AdvancedSettingsMenu(page10)

5

1.MaintenanceandService4.Cancel/Exit

2.GaugesandMeters

3.AdvancedSettings6.Enter/Return

Figure6

5.Togglebetweenscreens

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1.HydraulicTransOil

2.ServiceHistorydisplay

3.Servicereminderresetwasperformed(e.g.,250and750
enginehours)

Figure8

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MaintenanceandServiceMenu

Youcanscrollbetweenthefollowingscreensinthe
MaintenanceandServicemenu:

•HydraulicTransmissionOil(page6)

•EngineOil(page6)

•CurrentErrorMessages(page7)

•StatusofInputs(page7)

•StatusofOutputs(page7)

•MachineInformation(page8)

•ModuleInformation(page8)

HydraulicTransmissionOil

Thisservicereminderscreendisplaysthehoursuntil
thehydraulictransmissionoilmaintenanceisdue.

EngineOil

Thisservicereminderscreendisplaysthehoursuntil
theengineoilmaintenanceisdue.

g030188

Figure9

1.EngineOil

2.Reminderdisplay

3.Enginehoursremaininguntiltheserviceisdue

Pressthetogglebuttontoalsodisplaytheengine
hoursatwhicheveryservicereminderresetwas
performed.

Figure7

1.HydraulicTransOil

2.Reminderdisplay

3.Enginehoursremaininguntiltheserviceisdue

Pressthetogglebuttontoalsodisplaytheengine
hoursatwhicheveryservicereminderresetwas
performed.

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g030189

Figure10

1.Engineoil

2.ServiceHistorydisplay

3.Servicereminderresetwasperformed(e.g.,250and750
enginehours)

6

CurrentErrorMessages

•Seatswitch(highlightsifon)

Thisscreendisplaysthecurrenterrorastextwiththe
enginehoursatwhichtheerroroccurred.Thetoggle
buttonallowsyoutoscrollbetweenscreensifmultiple
errorsareactive.Ifonly1erroroccurs,thetoggle
buttondoesnotchangescreens.

Figure11

1.CurrentError

2.Errordisplay(e.g.,LowOilPressure)

3.Enginehourswhentheerroroccurred

StatusofInputs

Thisscreenlistsalloftheinputstothesystemand
highlightswhichiscurrentlyactive.Inputswith
numericalvaluesdisplaythecurrentvalue.

•Oil-pressureswitch(highlightsifon)

•Enginetemperature(showstemperature)

•WingDeck(ifapplicable—highlightsifthewing

decksaredownandreadytomow)

StatusofOutputs

Thisscreenlistsalloftheoutputsfromthesystem
andhighlightswhichoneiscurrentlyactive.Outputs
withnumericalvaluesdisplaythecurrentvalue.

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g293204

Figure13

1.Statusofoutputs

2.PTOoutput

3.Alarmoutput

4.Starteroutput

5.Enginepowertorun

6.Enginespeedoutput

7.Coolingfanoutput

Figure12

1.StatusofInputs

2.PTOswitch

3.Neutral

4.Oilpressure

5.Previous

6.Togglebetweenscreens

7.Next

8.Brake

9.Seat

10.Enginecommunication

11.Wingdeck(ifapplicable)

ThefollowingarealistofitemsavailableintheStatus
ofInputsscreen:

•Systemvoltage

•Enginecommunication(highlightsifmoduleis

communicatingwiththeengineECU)

ThefollowingarealistofitemsavailableintheStatus
ofOutputsscreen:

•PTOoutput(highlightsifon)

•Alarm(highlightsifon)

•Starter(highlightsifon)

•Engineshutdownoutput(highlightsifon)

g293188

•Enginespeedsignalshowsvoltagesignalsent

fromtheHorizonsystemtotheengineECU.

•Coolingfanoutput(ifapplicable)

•PTOswitch(highlightsifon)

•Fuelsendervoltage(showsvoltage)

•Neutralswitch(highlightsifon)

•Brakeswitch(highlightsifon)

7

MachineInformation

Thescreendisplaystheserialnumberandmodel
numberofthemachine.

g293225

Figure17

Figure14

1.MachineInformation3.Serialnumber

2.Modelnumber

ModuleInformation

Thescreendisplaysthecurrentinstalledversion
ofsoftwareandhardwareforboththeLDU(Logic
DisplayUnit)andtheMCU(MasterControlUnit).
SelectthetogglebuttontoseetheMCUscreen.

Figure15

1.Exit

g030190

2.Enter/Return

GaugesandMetersMenu

Youcanscrollbetweenthefollowingscreensinthe
GaugesandMetersmenu:

•EngineHours(page8)

•PTOHours(page9)

•FuelUsed(page9)

•FuelEconomy(page9)

•TripStatistics(page9)

EngineHours

Thisscreendisplaysanon-resettable,totalengine
hourcounterandresettabletripcounter.

g030191

1.ModuleInformation4.SoftwareVersion

2.LDU5.Toggle

3.HardwareVersion

Figure16

1.ModuleInformation

2.MCU4.SoftwareVersion

3.HardwareVersion

Toexitthescreen,pressthepreviousornextarrow
keys.Pressingtheenterbuttontakesyoubacktothe
MenuSelectionscreen.

g030202

Figure18

1.EngineHours3.Triphours

2.Totalhours4.Resettriphours

ToresettheTriphourmeter,highlighttheTriphour
meterandpresstheResetbutton;toconrmthe

g030192

reset,pressY(yes)orN(no)tocancel(Figure19).

8

Figure19

FuelEconomy

ThisscreendisplaystheUSgallons/litersoffuelused
perenginehour.

g030203

1.Reset

2.Areyousure?4.N(no)

3.Y(yes)

PTOHours

Thisscreendisplaysanon-resettable,totalPTOhour
counterandaresettabletripPTOcounter.

Figure20

1.PTOHours

2.Totalhours4.Resettriphours

3.Triphours

ToresettheTriphourmeter,highlighttheTriphour
meterandpresstheResetbutton;toconrmthe
reset,pressY(yes)orN(no)tocancel(Figure19).

FuelUsed

ThisscreendisplaysthetotalUSgallons/litersoffuel
usedfromthelasttimeitwasreset.Pressthereset
buttontoresetthefuelusedcounter.

g038363

Figure22

1.FuelEconomy

2.DisplaysUSgallons/liters
perhour

TripStatistics

Thereare5tripstatisticsscreenstoscrollthoughand
view.

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Figure23

1.TripStatistics

Eachscreenfeaturesresettablecountersforthe
followingparameters:EngineHours,PTOHours,and
totalUSgallons/litersoffuelused.

Youcanpauseorstopthecollectionofstatistics
andplayorstartthecollectionoftripstatistics.
Forexample,whenTripStatistics1ispaused,the
statisticsarehighlightedandtheresetbuttonis
available.Pressingtheresetbuttonresetsall3
parameters.Pressingtheplaybuttonstartsdata
collection.

2.Viewtripstatistics

Figure21

1.FuelUsed3.Reset

2.DisplaysUSgallons/liters
used

g038362

9

Figure24

AdvancedSettingsMenu

Whentheadvancedsettingsmenuisselected,the
modulepromptsyoufora4digitpasscode.The
defaultdigitsonthedisplayscreenare0000.

g038364

1.TripStatistics14.DisplaysUSgallons/liters

2.Displaysenginehours

3.DisplaysPTOhours

offuel

5.Play/Start

6.Reset

Whenatripstatisticisplaying,thestatisticsarenot
highlightedandtheresetbuttonisblackedoutand
notavailable.Pressingthepausebuttonstopsthe
collectionofdata.

Figure25

1.TripStatistics44.DisplaysUSgallons/liters

2.Displaysenginehours

3.DisplaysPTOhours

offuel

5.Pause/Stop

PressthetogglebuttonontheTripStatistics5screen
togobacktothemainTripStatisticsscreen.

g030221

Figure26

1.Enterpassword

2.Activedigits5.Decrease

3.Increase

4.Enter/Return

Thepasscodeis1982.Whentheactivedigitis
highlighted,presstheincreaseordecreasebuttonsto
scrollthroughdigitsfrom0to9.Pressentertoselect
thehighlighteddigit.

Ifyouentertheincorrectpassword,themoduletakes
youbacktothemenuselectscreen.Whenthecorrect
passwordisentered,youcanscrollbetweenthe
followingscreens:

g038365

•HydraulicTransmissionOil(page10)

•EngineOil(page11)

•HistoricalError(page11)

•Alarms(page11)

•EngineSettings(page12)

•CalibrateEngineSettings(page12)

•FactoryDefaults(page13)

HydraulicTransmissionOil

Afterperformingthenecessarymaintenance,this
screenallowsyoutoresetthenumberofhoursuntil
thehydraulictransmissionoilserviceisdue.

Figure27

1.HydraulicTransOil

2.Reminderdisplay4.Reset

10

3.Remaininghoursuntil
service

g263439

Pressingtheresetbuttonbringsupascreenaskingto
selectaresetoption.

Everytimeyouresetthehydraulictransmissionoil
servicereminder,themodulepromptsyoutoselect
whetherthemachinewasservicedwithT oroPremium
HydraulicOil.PressingY(yes)orN(no)determines
thecorrectmaintenanceschedule.

EngineOil

Afterperformingthenecessarymaintenance,this
screenallowsyoutoresetthenumberofhoursuntil
theengineoilserviceisdue.

Alarms

Thealarmsscreenallowsyoutoactivateand
deactivatetheaudiblealarmforindividualerrors.
PresstheEnterbuttontoaccessindividualerroralarm
settings.

Note:Notallaudiblealarmscanbedeactivated.

Figure30

1.Alarms3.AudibleAlerts

2.Activate/Deactivate

4.Enter

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Figure28

1.EngineOil

2.Reminderdisplay4.Reset

3.Remaininghoursuntil
service

Pressingtheresetbuttonbringsupascreenaskingto
conrmtheresetreminder.

HistoricalError

Thisscreendisplayserrorsthatarenolongeractive.
Thelogkeepsarunningcountofthenumberoftimes
theerrorhasoccurredduringthelifeofthemachine
andtheenginehouratwhichthelastoccurred.The
logdisplaystheerrorsstartingwiththemostrecent
occurrence.

Figure29

1.HistoricalError

2.Currenterror(e.g.LowOil
Pressure)

3.Numberoftimestheerror
occurredduringlifeof
machine(e.g.,3X)

4.Enginehouratwhichthe
errorlastoccurred

g030245

alarmisactive.Pressingentermodiesthestatusof
theaudiblealarmtoOnorOff.

Thehighlightederrornameindicatesthattheaudible

g038366

Figure31

1.Alarms4.Toggle

2.ClutchOvercurrent

3.FuelLow

5.Enter

Youcandeactivatetheaudiblewarningforthe
followingerrors:

•ServiceAirFilter

•ServiceEngineOil

•ServiceTransmissionOil

•TransOverT emp

g030224

•FuelLow

•ClutchOvercurrent

•ClutchResetRequired

•EngineErrorCodes

•SystemOvervoltage>16VDC

•SystemUndervoltage<9VDC

•SystemVoltageLow

•Anti-Stall

11

EngineSettings

CalibrateEngineSettings

Thisscreenallowsyoutoadjusttheenginespeed
attheMaximum,Efcient,andLowsetpointsfor
bothtransport(clutchdisengaged)andmow(clutch
engaged)modesin50rpmincrements.

Figure32

1.EngineSettings2.AdjustEngineSpeeds

Pressingtheuparrowincreasestheenginespeed
whilepressingthedownarrowdecreasestheengine
speed.PressingtheEnterbuttonconrmsthe
speedandautomaticallymovesyoutothenext
screen/enginespeedsetpoint.

Thisscreenallowsthecalibrationoftheactualengine
speedtomatchthecommandedenginespeed.
Theenterbuttonblacksoutifthebladesarenot
disengaged,theparkingbrakeisnotengaged,and
themotion-controlleversarenotintheNEUTRAL-LOCK
position.Oncetheyare,presstheEnterbuttonto
startthecalibrationprocess.

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g030234

Figure34

1.CalibrateEngineSettings2.StartCalibration

Ananimatedhourglassappearsindicatingthe
calibrationisinprocess.

Figure33

1.EngineSettings

2.SetLowMowSpeed

3.Enginespeedinrpm(e.g.,
3,600rpm)

4.Uparrow—Increase

5.Enter

6.Downarrow—Decrease

Thesystemdoesnotallowthefollowingtooccur:

•Theefcientspeedcannotbesethigherthanthe

maximumspeed.

•Thelowspeedcannotbesethigherthanthe

efcientspeed.

Note:Youcansetthemaximumspeedequaltothe

efcientmowspeedtousetheefcientmodewhile
mowing.

g030228

1.CalibrateEngineSpeed

2.Calibrating

Figure35

3.Processing

g030235

Oncethecalibrationiscomplete,youcantoggleback
totheprimaryCalibrateEngineSpeedscreen.

g030237

Figure36

1.CalibrationEngineSpeed

2.CalibrationComplete

3.Togglebetweenscreens

12

FactoryDefaults

Thisscreenallowsyoutoresetsystemsettingsback
tothefactorydefaultsettings.PressingtheEnter
buttonbringsupconrmationscreen;pressY(yes)to
resetorN(no)tocancel.

Note:Resettingthesystemreturnstheenginespeed

settingsandalarmsettingsbacktothefactorydefault
settings.

Figure37

1.FactoryDefaults

Whentheexitscreenappears,presstheenterbutton
togobacktotheMenuSelectionscreen.

2.Reset

Adjustingthe
Electronically-Controlled
LowModeSpeed
Adjustment

Whenoperatinginlowmowmode,pressandholdthe
LowSpeedModebuttonreducetheenginespeed
(minimumof2,250rpm).PresstheLowSpeedMode
buttonagaintoreturntheenginetothedefaultsetting.

AutoIdleDownMode

Iftheoperatorleavestheseatandthesafetyinterlocks
allowtheenginetoremainrunning,thesystementers

g030238

theautoidlemodeandautomaticallysettheengine
speedtothelowtransportspeed.Whenyoureturn
totheseat,thesystemautomaticallyreturnstothe
previouslyselectedenginespeedmode.Ifyouselect
anotherenginespeedsetting,thesystemexitsthe
autoidlemodeandtheenginerunsattheselected
speed.

ReturningtotheDefault
Screen(Engine-Onor
Engine-Off)

Thereare3waystoreturntothedefaultscreen:

•Pressthepreviousornextarrowkeysuntilthe

ExitscreenappearsthenpresstheEnterbuttonto
returntotheMenuSelectionscreen.

•TurntheignitionkeytotheOFFpositionand

eitherrestarttheengineorturnthekeytotheON
position.

•Pressandholdthe2outsidebuttons.

SettingEngineSpeeds

Atstartup,thesystemdefaultstotheLowengine
speed.Theiconontheinformationscreenis
highlighted.

•PressthebuttonbelowtheEfcientSpeedMode

icontoincreasetheenginespeedtotheEfcient
enginespeed.

TheEfcientSpeedModeiconishighlighted.

•PressthebuttonbelowtheMaximumSpeedMode

icontoincreasetheenginespeedtothemaximum
enginespeed.

TheMaximumSpeedModeiconishighlighted.

Note:IfyouengagethePTOswitchatanyspeed

setting,theenginespeedincreasestothemowspeed.

ErrorMessages

Ifanerroroccurs,amessagedisplaysinplaceofthe
enginetemperature,enginespeed,andfuellevel.In
additiontodisplayingthefaultastext,thesystem
turnstheLEDredandsoundstheaudiblealarm.

•Thesystemiscapableofdisplayingthefollowing

errors:

–ServiceEngineOil:engineoilmaintenance

isrequired.

–ServiceTransmissionOil:transmissionoil

maintenanceisrequired.

–LowOilPressure:lowengineoilpressureis

detected.

–FuelLow:fuellevelislow

–EngineOverTemperature:engineover

temperaturedetected.

–SystemOvervoltage>16VDC:systemvoltage

istoohigh(greaterthan16V).

–SystemUndervoltage<9VDC:systemvoltage

istoolow(greaterthan9V).

–ClutchOvercurrent:cuttingclutchcurrentis

toohigh.

–ClutchResetRequired:indicatesthatthe

PTOswitchmustbeturnedoffandthenonto
reactivatethePTOclutch.Itmayalsoindicate
thatthewingdeckswitchhasbeentripped(if
applicable).

13

–EngineErrorCodes:thesystemdisplays

engineerrorcodesprovidedbytheengine
manufacturer.

–ClutchOutputFault:clutchoutputisopenor

shorted.

–SystemVoltageLow:voltageistoolow(less

than12.3V).

–EngineCommunicationError:

communicationlostbetweentheengine
andmodule.

–ModuleCommunicationError:

communicationislostbetweentheLDU
andMCUmodules.

–Anti-StallActive:themowerdeckhasbeen

disengagedinordertopreventtheengine
stalling.

–WingDeckInterlockFault(applicable

models):thesignalfromthedecksensors
indicatesthatthewingdeckhasnotbeenfully
lowered.

•Youcanacknowledgeandsilencesomeofthe

errorslistedabove.Movethemotion-control
leverstotheNEUTRAL-LOCKpositionandpress
andholdthemiddlebutton.

Acknowledginganerrorremovestheerror
messagefromtheenginetemperature,engine
speed,orfuelleveliconareaandsilencethe
audiblealarm.However,theerrorcontinues
todisplayontheactiveerrorscreeninthe
MaintenanceandServiceMenuandthestatus
LEDcontinuestobeilluminatedred.

–Thefollowingerrorsemitaslowchirpingsound

thatyoucanacknowledgeandsilence:

◊ServiceEngineOil
◊ServiceTransmissionOil
◊FuelLow
◊ClutchOvercurrent
◊ClutchResetRequired
◊EngineErrorCodes
◊Anti-StallActive

–Thefollowingerrorsemitafastchirpingsound

andcanbeacknowledgedandsilenced:

◊SystemOvervoltage>16VDC
◊SystemUndervoltage<9VDC

–Thefollowingerrorcodesemitafastchirping

soundandcannotbeacknowledgedor
silenced.

◊LowOilPressure
◊EngineOverTemperature
◊EngineCommunicationError
◊ModuleCommunicationError

◊ClutchOutputFailure

•Inordertoprotectthesystemcomponentsfrom

exceedingthresholdlimits,thesystemlimitsthe
enginespeedand/ordisengagestheclutch,which
allowsyoutodrivethemachineontoatraileror
returntoaservicearea.

Thesearethefollowingerrorsthatmayoccur:

1.ClutchOvercurrent

Ifanovercurrenteventoccurs,thesystem
limitstheenginespeedtotheEfcient
TransportModespeedandplacesthe
machineinSafeTransportMode.Safe
TransportModelimitstheenginespeed,
locksoutthePTO,anddisengagesthe
clutch;aClutchOvercurrenterrormessage
willdisplay.CyclingthekeyswitchtotheOFF
andthentotheONpositionclearsthefault.

2.SystemOvervoltage>16VDC

Ifthevoltageexceeds16V ,thesystemwill
disengagetheclutchanddisplaysaSystem
Overvoltage>16VDCerrormessage.

3.SystemUndervoltage<9VDC

Ifthevoltageislessthan9V,thesystem
willnotallowclutchengagementanddisplay
theerrorSystemUndervoltage<9VDC.If
theclutchwasengagedbeforetheerror
occurred,thesystemallowstheclutchto
remainengaged;however,lowvoltagemay
causetheclutchtodisengageitself.

4.LowOilPressure

Iflowengine-oilpressureisdetected,the
systemlimitsenginespeedtotheEfcient
TransportModespeedandplacesthe
machineinSafeTransportMode.Safe
TransportModelimitstheenginespeed,
locksoutthePTO,anddisengagesthe
clutch;aLowOilPressuremessagewill
display.CyclingthekeyswitchtotheOFF
andthentotheONpositionclearsthefault.

5.EngineOverTemperature

Whentheenginebeginstooverheat,the
systemashestheenginetemperature
bargraphandchirpstheaudiblealarm.
Ifthetemperaturerisesabovetheupper
limit,thesystemlimitstheenginespeed
totheEfcientTransportModespeedand
placesthemachineinSafeTransportMode.
SafeTransportModelimitstheengine
speed,locksoutthePTO,anddisengages
theclutch;anEngineOverT emperature
messagedisplays.Thefaultclearsoncethe
temperaturefallsbelowasafelimit.

14

Troubleshooting

SystemErrorMessageStatusLEDSystemActions

ServicetheEngineOil

Servicethe
TransmissionOil

LowOilPressure

EngineOver
Temperature

FuelLowBlinkRed

SystemOvervoltage
>16VDC

BlinkRed

BlinkRed

BlinkRed

Green

BlinkRed

BlinkRed

SafeTransport
Mode—enginelimited
toEfcientmodeandthe
PTOisdisengaged.

Singlealarmchirpand
enginetemperature
displayashes.

SafeTransport
Mode—enginelimited
toEfcientmodeandthe
PTOisdisengaged.

Disallowclutch
engagement/Disengage
theclutch.

IssueDescription

Theengineoilservice
isdue.

Thetransmissionoil
serviceisdue.

Theengine-oil
pressureisbelow
limit.

Theengine
temperatureishigh.

Theengine
temperatureisabove
limit.

Thefuellevelislow.

Thesystemvoltageis
excessive(above16
V).

RecommendedCorrectiveAction

Replacetheengineoilandlter.
Followtheresetprocedure;referto

EngineOil(page1 1).

Replacethetransmissionoiland
lter(s).Followtheresetprocedure;
refertoHydraulicTransmissionOil

(page10)

Cyclethekeyswitchtoclearthe
fault.Checktheoillevel.Contactan
AuthorizedServiceDealer.

Checktheoillevel.Cleandebrisfrom
theengine.Inspecttheenginefan.
ContactanAuthorizedServiceDealer.

Checktheoillevel.Cleandebrisfrom
theengine.Inspecttheenginefan.
ContactanAuthorizedServiceDealer.

Checkthefuellevelandaddfuelas
necessary.

Checkthebatteryandengine
chargingsystem.Contactan
AuthorizedServiceDealer.

SystemVoltageLow

SystemUnder
voltage<9VDC

ClutchOvercurrent

ClutchResetRequired

ClutchOutputFault

EngineMILErrorsBlinkRed

Engine
CommunicationError

BlinkRed

BlinkRed

BlinkRed

Alternating
green/orange

BlinkRed

BlinkRed

Disallowclutch
engagement/Disengage
clutch.

SafeTransport
Mode—enginelimited
toEfcientmodeandthe
PTOisdisengaged.

Systemvoltagebelow

12.3V .

Thesystemvoltageis
belowthelowerlimit
of9V .

Theclutchcurrentis
abovethelimit.

ThePTOswitchis
engagedandthe
modulehaslatched
theclutchoutputOff.

Theclutchoutputhas
ashortorisopen.

TheECUhasdetected
afault.

Thecommunication
betweenthemodule
andtheengineECU
hasbeenlost.

Checkthebatteryandengine
chargingsystem.Contactan
AuthorizedServiceDealer.

Checkthebatteryandengine
chargingsystem.Contactan
AuthorizedServiceDealer.

Cyclethekeyswitchtoclearthe
fault.CheckthePTOclutchcondition
andtherelatedwiring.Contactan
AuthorizedServiceDealer.

CyclethePTOswitchtotheOFF
positionandbacktotheONposition
toengagetheclutch.

IftheclutchisstuckintheONposition,
discontinueuseandcontactan
AuthorizedServiceDealer.Check
theclutchconnectionandassociated
wiringforanopencircuit.

Seetheengineowner’smanualforthe
errordescriptionandtroubleshooting
information.

Checktheelectricalconnectionsat
themodule,interconnectbetween
theenginewireharness,andchassis
harness.Checktheconnections
attheengineECU.Contactan
AuthorizedServiceDealer.

15

SystemErrorMessageStatusLEDSystemActions

IssueDescription

RecommendedCorrectiveAction

Module
CommunicationError

Anti-StallActive

WingDeckInterlock
Fault(forapplicable
models)

SafeTransport

BlinkRed

BlinkRed

BlinkRed

Mode—enginelimited
toEfcientmodeandthe
PTOisdisengaged.

PTOdisengaged,error
displayed.

Disallowclutch
engagement/Disengage
clutch

Thecommunication
betweentheLDU
moduleandMCU
modulehasbeenlost.

Enginespeeddrops
belowoperatinglimit.

Wingdecknotfully
deployed.

Checktheelectricalconnectionsat
theLDUandMCUmodule.

Waitfortheenginespeedtorecover,
thencyclethePTOswitchtotheOFF
positionandthentotheONposition
toengagetheclutch.Iftheproblem
persists,turnthekeytotheOFF
positionandinspectthemowerdeck
andenginefordebris.

Deploythewingdeck,thencyclethe
PTOswitchtotheOFFpositionand
thentotheONpositiontoengagethe
clutch.ContactanAuthorizedService
Dealer.

16