Technical Service Information Bulletin

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1、HEATING&AIRCONDITIONINGAC005-04Title:SENSORINSPECTIONFORAIRTechnicalServiceCONDITIONINGSYSTEMInformationBulletinModels:’90–CurrentAllModelsDecember16,2004IntroductionThisservicebulletincontainsinspectionprocedurestomorepreciselyconfirmproperoperationofthefollowingt

2、emperaturesensorsoftheairconditioningsystem.Followtheproceduresinthisservicebulletinwheninspectingthesesensors.Thesecontentswillbereflectedinfuturerepairmanuals.SRoomTemperatureSensorSAmbientTemperatureSensorSAirDuctSensorSEvaporatorTemperatureSensorSSolarSensorSRo

3、omHumiditySensorApplicableSAll1990–CurrentmodelyearLexusvehicles.VehiclesWarrantyOPCODEDESCRIPTIONTIMEOFPT1T2InformationN/ANotApplicabletoWarranty––––LexusSupportsASECertificationPage1of12SENSORINSPECTIONFORAIRCONDITIONINGSYSTEM–AC005-04December16,2004Inspection1.I

4、nspectRoomTemperatureSensor.ProcedureA.Measurethesensorresistance.ResistanceValueat77°F1700+/–85W(25°C)NOTE:SEvenslightlytouchingthesensormaychangetheresistancevalue.Besuretoholdtheconnectorofthesensor.SWhenmeasuring,thesensortemperaturemustbethesameastheambienttem

5、perature.HINT:Asthetemperatureincreases,theresistancedecreases.TEMPERATURE°F(°C)SPECIFICATIONkWResistance50(10)3.00to3.73kW4.059(15)2.45to2.883.53.068(20)1.95to2.302.577(25)1.60to1.802.086(30)1.28to1.471.595(35)1.00to1.221.0Max104(40)0.80to1.000.5Min113(45)0.65to0.

6、850.03268104140122(50)0.50to0.70(0)(20)(40)(60)Temperature°F(°C)131(55)0.44to0.60140(60)0.36to0.50Page2of12SENSORINSPECTIONFORAIRCONDITIONINGSYSTEM–AC005-04December16,2004Inspection2.InspectAmbientProcedureTemperatureSensor.(Continued)A.Measurethesensorresistanceac

7、cordingtotheselectedgraph(specification).ResistanceValueat77°F1700+/–85W(25°C)NOTE:SEvenslightlytouchingthesensormaychangetheresistancevalue.Besuretoholdtheconnectorofthesensor.SWhenmeasuring,thesensortemperaturemustbethesameastheambienttemperature.HINT:Asthetemper

8、atureincreases,theresistancedecreases.TEMPERATURE°F(°C)SPECIFICATIONkWResistancekW50(10)3.00to3.734.059(15)2.45to2.883.53.068(20)1.95to2.302.577(