Allison Transmission 4430 OFS

5.8.2.2ELECTRONICFLUIDLEVELCHECKPROCEDURE
NOTE:TheTCMdelaystheuidlevelcheckuntilthefollowing
conditionsaremet:
•Theuidtemperatureisabove40°C(104°F)orbelow104°C
(220°F).
•ThetransmissionisinN(Neutral).
•Thevehiclehasbeenstationaryforapproximatelytwominutes
toallowtheuidtosettle.
•Theengineisatidle.
•WhenuidlevelcheckisdelayedbytheTCM,acountdown
timerinminutesandsecondsappearsintheselectorgraphics
display.
TheOLSisdesignedtomeasuretransmissionuidlevel.Tochecktheuid
levelelectronicallyfromtheshiftselector,dothefollowing:
1.ParkthevehicleonalevelsurfaceandshifttoN(Neutral).
2.Applytheparkingbrakeandallowtheenginetoidle(500–800rpm).
3.Makesurevehicleisstoppedwithtransmissionoutputshaftspeedat
0rpm.
4.Allowasettlingperiodoftwominutestofacilitateoildrainbacktime.
TheTCMcommunicatesstatusonceuidlevelrequestisinitiated.
5.Fluidlevelmeasurementandreadoutmaybeinitiatedbypressing
onceon:
•Bump-ShiftLeverselector—presstheDISPLAY
MODE/DIAGNOSTIC(DMD)buttononce.RefertoFigure4–1.
•KeypadPushbuttonshiftselector—simultaneouslypressthe↑
(Upshift)and↓(Downshift)arrowsonce.RefertoFigure4–1.
6.CorrectuidlevelisdisplayedasshowninFigure5–2.
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