Allison Transmission T 375

Table4–1.DESCRIPTIONOFAVAILABLERANGES
DescriptionofAvailableRanges(refertoFigure4–1)
WARNING:Ifyouleavethevehicleandtheengineisrunning,
thevehiclecanmoveunexpectedlyandyouorotherscould
beinjured.Ifyoumustleavetheenginerunning,DONOT
LEAVEthevehicleuntilyouhavecompletedallofthefollowing
procedures:
•PutthetransmissioninN(Neutral).
•Besuretheengineisatlowidle(500–800rpm).
•Applytheparkingandemergencybrakesandmakesure
theyareproperlyengaged.
•Chockthewheelsandtakeotherstepsnecessarytokeep
thevehiclefrommoving.
WARNING:R(Reverse),R1(DeepReverse),orR2(Standard
Reverse)maynotbeattainedduetoanactiveinhibitor.Always
applytheservicebrakeswhenselectingR(Reverse),R1(Deep
Reverse),orR2(StandardReverse)topreventunexpected
vehiclemovementandbecauseaservicebrakeinhibitmaybe
present.WhenR,R1,orR2isashing,itindicatestheshiftto
R(Reverse),R1(DeepReverse),orR2(StandardReverse)
isinhibited.DetermineifdiagnosticcodesareactiveifR
(Reverse),R1(DeepReverse),orR2(StandardReverse)isnot
attained.Referto7.5SELECTORDISPLAYDESCRIPTIONS
FORACTIVEDIAGNOSTICTROUBLECODES(DTCs)AND
INHIBITS
CAUTION:DonotidleinR(Reverse),R1(DeepReverse),or
R2(StandardReverse)formorethanveminutes.Extended
idlingintheserangescancausetransmissionoverheating
anddamage.AlwaysselectN(Neutral)whenevertimeatidle
exceedsveminutes.
NOTE:Checktheshiftselectortoverifytheselectedrange
wheneverabuttonispushedortheleverismovedtobe
suretherangeselectedisindicated.Aashingrangeselect
characterintheVFDindicatestherangeselectedwasnot
attainedduetoanactiveinhibit.Referto4.1.3SELECTOR
DISPLAYFLASHING(INHIBITS)foradditionalinformation.
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