variesforeachoftheconditionsmonitoredbythesystem(referto7.4TRANS
SERVICEINDICATOR(WRENCHICON)).
AllSegmentsIlluminated:Ifallsegmentsofthedisplayareonfor
morethan12seconds,theTCMhasnotcompletedinitialization.ADTCis
associatedwiththiscondition.Itisnormalforallsegmentstoilluminatefora
brieftimeduringinitializationoftheselectorandcontrols.
SELECT/MONITORBOTHBLANK:Thisconditionindicateseitheralackof
powertotheselectorortheSAEJ1939communicationdatalinkhasfailed.
Continuousblankindicateslossofpowertotheselector.Iftheblankdisplay
changestoadoublecat-eyedisplay,otherconditionsexist.Refertodouble
cat-eyediscussionbelow.
DoubleCat-Eyes:ThisdisplayindicatesafailureoftheSAEJ1939
communicationlinkandmaybeaccompaniedbyaDTC.Thecat-eyesare
illuminatedinboththeSELECTandMONITORlocationsafterapproximately
12secondsofblankdisplay.
WARNING:WithouttheSAEJ1939communicationdatalink,the
shiftselectorcannotdisplaytheselectedtransmissionrange.Vehicle
operationwillbeaffected.
7.6SELECTORDISPLAYISINOPERATIVE
IntheeventcommunicationwiththeSAEJ1939datalinkislost,limited
communicationbetweentheTCMandtheAllisonkeypadpushbuttonand
levershiftselectorscontinuesthroughdirectionsignalwire134.Thislimited
communicationallowstheoperatortoselectD(Drive),N(Neutral),orR
(Reverse)inordertogetthevehicletoaservicelocation.Operatorrequests
forrangeupshiftsanddownshiftswillnotberecognized,andtheshiftselector
displaywillnotdisplaytheselectedtransmissionrangeduetothelackofa
SAEJ1939datalinksignal,butdisplaysdoublecat-eyes.
WARNING:Assumingproperinstallationofdirectionsignalwire
134,mostAllisonshiftselectorsmaystillbeusedtocommand
transmissiondirectionchangesinthesecircumstances.Duetothe
failureoftheSAEJ1939datalinkcommunication,however,theshift
selectorcannotdisplaytheselectedrange.Whenthiscondition
exists,itisadvisabletoslowlyandcarefullyapplythethrottleeach
timeachangeofdirectionhasbeenselectedinordertoverifythe
directionofoperationbeforeacceleratingthevehicle.
133
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