AIR CONDITIONING SYSTEM - WordPress
AC–1AIR CONDITIONING SYSTEM
AC–2AIR CONDITIONING SYSTEM–GENERAL DESCRIPTIONGENERAL DESCRIPTIONNEW AIR CONDITIONING SYSTEM WITHHFC134aRefrigerant CFC 12 (R 12), previously used in automobiles’air conditioning systems is believed to contribute towards thedepletion the earth’s ozone layer. The ozone layer help toprotect us against the harmful ultraviolet rays of the sun.A newly developed refrigerant, HFC 134a (R 134 a), does notthe destroy the ozone layer.PRECAUTIONS FOR SERVICINGHFC134a AIR CONDITIONINGS1.USE OF NEW REFRIGERANT HFC134aThe very different characteristics of refrigerants HFC134aand CFC12 have determined the design of their respectiveair conditioning systems. Under no circumstances allowCFC12 to enter an HFC134a system, or vice versa, becauseserious damage could occur.2.USE OF PROPER COMPRESSOR OILCompressor oil used in conventional CFC12 air conditioningsystems cannot be used in HFC134a air conditioning systems.Always use genuine Toyota R134a air conditioning oil ND–OIL 8, made expressly for use with HFC134a.NOTICE: Compressor oil (ND–OIL 8) for HFC134a use adversely affects acrylic resin, so take care not to spill orspray any compressor oil.If even a small amount of the wrong oil is changed, it will resultin clouding of the refrigerant.A large amount will cause the compressor to seize up.
AC–3AIR CONDITIONING SYSTEM3.–GENERAL DESCRIPTIONUSE OF PROPER O–RINGS AND SEALSO–rings and seals used for conventional CFC12 air conditioning systems cannot be used for HFC134a air conditioningsystems.Always use genuine Toyota HFC134a system O–rings andseals for HFC134a air conditioning systems.If O–rings and/or seals for CFC12 air conditioning systemsare used by mistake in the connections of an HFC134a airconditioning system, the O–ring and seals will foam and swellresulting in leakage of refrigerant.4.TIGHTEN CONNECTING PARTS SECURELYSecurely tighten the connecting parts to prevent leaking ofrefrigerant gas. Apply a few drops of compressor oil to O–ring fittings foreasy tightening and to prevent leaking of refrigerantgas.CAUTION: Apply only ND–OIL 8 compressor oil. Tighten the nuts using 2 wrenches to avoid twisting thetube. 5.6.7.Tighten the O–ring fittings or the bolted type fittings tothe specified torque.INSERT PLUG IMMEDIATELY IN DISCONNECTED PARTSInsert a plug immediately in the disconnected parts to prevent the ingress of moisture and dust.DO NOT REMOVE PLUG FROM NEW PARTS UNTILIMMEDIATELY BEFORE INSTALLATIONDISCHARGE GAS IN NEW COMPRESSOR FROMCHARGING VALVE BEFORE INSTALLING ITIf the gas in the new compressor is not discharged first, compressor oil will spray out with gas when the plug is removed.
AC–4AIR CONDITIONING SYSTEM–GENERAL DESCRIPTIONSERVICE TOOLS FOR HFC134a AIRCONDITIONINGWhen servicing HFC134a air conditioning systems alwaysuse the HFC134a dedicated manifold gauges, gas leak detector and vacuum pump adaptor.1.USE MANIFOLD GAUGES FOR HFC134a AIRCONDITIONINGAlways use HFC134a dedicated manifold gauges to preventCFC 12 and CFC 12 compressor oil contaminating theHFC134a system.2.USE HFC134a GAS LEAK DETECTORSimilarly, always use an HFC134a dedicated leak detector.The CFC12 leak detector is not sufficiently sensitive.3.USE VACUUM PUMP ADAPTERBy connecting a vacuum pump adapter, the vacuum pumpcan be used for both HFC134a and CFC12 air conditioningsystems.The vacuum pump adaptor has an internal magnetic valve.When evacuation is completed and the vacuum pump switchis turned off, the magnetic valve opens allowing the introduction atmospheric air into the manifold gauges to prevent theback flow of oil from the vacuum pump into the gauge hose.CAUTION:Be sure to turn off the manifold gauge valve immediatelyafter evacuating the system. Then you may switch off thevacuum pump. If this order is reversed, the line will betemporarily open to atmosphere.
AC–5AIR CONDITIONING SYSTEM–GENERAL DESCRIPTIONHANDLING PRECAUTIONS FORREFRIGERANT1.2.DO NOT HANDLE REFRIGERANT IN AN ENCLOSEDAREA OR NEAR AN OPEN FLAMEALWAYS WEAR EYE PROTECTION3.BE CAREFUL THAT LIQUID REFRIGERANT DOES NOTGET IN YOUR EYES OR ON YOUR SKINIf liquid refrigerant gets in your eyes or on your skin:(a) Wash the area with lots of cool water.CAUTION: Do not rub your eyes or skin.(b) Apply clean petroleum jelly to the skin.(c) Go immediately to a physician or hospital for professionaltreatment.HANDLING PRECAUTIONS FORREFRIGERANT CONTAINER1.2.NEVER HEAT CONTAINER OR EXPOSE IT TO NAKEDFLAMEBE CAREFUL NOT TO DROP CONTAINER AND NOT TOAPPLY PHYSICAL SHOCKS TO ITCHARGING AND LEAK–CHECKMETHODSEvacuate the refrigeration system according to the followingprocedures.10 min.StartEvacuationLeave for 5 min.StopEvacuationCheck and correctpipe jointsAirtightCheckRefrigerantChargeAbnormal indication ofmanifold gaugesGas LeakCheckRefrigerantChargeFill refrigerant in gas state untilgauge pressure reads 1 kg/cm2
AC–6AIR CONDITIONING SYSTEM–GENERAL DESCRIPTIONCAUTION: Be sure to connect both the high and low pressurequick–connectors onto the A/C system when evacuating.If only one side is connected, the system would be opento atmosphere through the other connector, making itimpossible to maintain vacuum.Be sure to turn off the manifold gauge valve immediatelyafter evacuating the system. Then you may switch off thevacuum pump.PRECAUTIONS WHEN CHARGINGREFRIGERANT1.2.3.DO NOT OPERATE COMPRESSOR WITHOUT ENOUGHREFRIGERANT IN REFRIGERANT SYSTEMIf there is not enough refrigerant in the refrigerant system, oillubrication will be insufficient and compressor burnout mayoccur, so take care to avoid this.DO NOT OPEN HIGH PRESSURE MANIFOLD VALVEWHILST COMPRESSOR IS OPERATINGIf the high pressure valve is opened, refrigerant flows in thereverse direction and could cause the charging cylinder torupture, so open and close the low pressure valve only.BE CAREFUL NOT TO OVERCHARGE SYSTEM WITHREFRIGERANTIf refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheatingetc.SUPPLEMENTAL RESTRAINT SYSTEM(SRS)Failure to carry out service operations in the correct sequence could cause the supplemental restraint system todeploy, possibly leading to a serious accident.During removal or installation of the parts and the yellow wireharness and connector for the airbag is necessary, refer tothe precautionary notices in the RS section before carryingout operation.
AC–7AIR CONDITIONING SYSTEMDESCRIPTIONPARTS LOCATION–DESCRIPTION
AC–8AIR CONDITIONING SYSTEM–DESCRIPTIONDAMPERS OPERATIONModeMode ControlDamper PositionVentHeatDef.FaceBi–LevelFoot* IFoot* IIFoot/Def.Def.The size of the circleindicates the proportion of air flow volume.Foot I indicates the status during automatic control and Foot II indicates the status during manualcontrol.
AC–9AIR CONDITIONING SYSTEM–PREPARATIONPREPARATIONSST (SPECIAL SERVICE TOOLS)Air Conditioner Service Tool SetRefrigerant Drain Service ValveT–JointQuick CouplerDischarge (diam. 16 mm)Quick CouplerSuction (diam. 16 mm)Refrigerant Charging GaugeRefrigerant Charging HoseDischarge (Red)Refrigerant Charging HoseSuction (Blue)Refrigerant Charging HoseUtility (Green)Magnetic Clutch RemoverMagnetic Clutch StopperSnap Ring PliersGas Leak Detector Assembly
AC–10AIR CONDITIONING SYSTEM–PREPARATIONRECOMMENDED TOOLSTOYOTA Electrical Tester ÑÑÑÑÑÑÑÑÑÑItemCompressor oilCapacityClassification–ND–OIL 8 or equivalentWhen replacing receiver10 cc (0.34 fl.oz.)When replacing condenser40 cc (1.4 fl.oz.)When replacing evaporator40 cc (1.4 fl.oz.)When replacing compressor140 cc (4.8 fl.oz.)
AC–11AIR CONDITIONING SYSTEM–USE OF MANIFOLD GAUGE SETUSE OF MANIFOLD GAUGE SETMANIFOLD GAUGE SET INSTALLATION1.2.3.4.5.CONNECT CHARGING HOSES TO MANIFOLD GAUGESETTighten the nuts by hand.CAUTION: Do not connect the wrong hoses.CONNECT QUICK CONNECTORS TO CHARGING HOSESTighten the nuts by hand.CLOSE BOTH HAND VALVES OF MANIFOLD GAUGESETREMOVE CAPS FROM SERVICE VALVES ONREFRIGERANT LINECONNECT QUICK CONNECTORS TO SERVICE VALVESHINT: Push the quick connector onto the service valve, thenslide the sleeve of the quick connector downward to lock it.MANIFOLD GAUGE SET REMOVAL1.2.3.CLOSE BOTH HAND VALVES OF MANIFOLD GAUGESETDISCONNECT QUICK CONNECTORS FROM SERVICEVALVES ON REFRIGERANT LINEHINT: Slide the sleeve of the quick connector upward to unlock the connector and remove it from the service valve.INSTALL CAPS TO SERVICE VALVES ON REFRIGERANTLINE
AC–12AIR CONDITIONING SYSTEM–MEMO––USE OF MANIFOLD GAUGE SET
AC–13AIR CONDITIONING SYSTEM–TROUBLESHOOTINGTROUBLESHOOTING
AC–14AIR CONDITIONING SYSTEM–TROUBLESHOOTINGHOW TO PROCEED WITH TROUBLESHOOTINGPerform troubleshooting in accordance with the procedure on the following page.Vehicle Brought to WorkshopCustomer Problem AnalysisP. AC–16Items insideare titles of pages in thismanual, with the page number indicated in the bottomportion. See the indicated pages for detailed explanations.Check and Clear Trouble Code (Precheck)P. AC–19Problem Symptom ConfirmationSymptom SimulationP. IN–24Trouble Code CheckP. AC–19Trouble Code ChartP. AC–19Actuator CheckCircuit InspectionP. AC–28 AC–70Identification of ProblemRepairConfirmation TestEndMatrix Chart of Problem SymptomsP. AC–26Part Inspection
AC–15AIR CONDITIONING ÑÑÑÑÑÑÑÑÑÑÑÑCUSTOMER PROBLEM ANALYSIS CHECK SHEETAIR CONDITIONING SYSTEM Check Sheet
AC–16AIR CONDITIONING SYSTEM–TROUBLESHOOTINGPANEL DIAGNOSIS SYSTEMIf a trouble occurs in A/C system, the specified lamp on the control panel starts blinking during the diagnostic sensor check.During system diagnosis, a trouble is indicated on the panel by the blinking of a specified light instead ofa code display. (See TROUBLE CODE CHART)For example, when a trouble occurs in solar sensor circuit, the LED for DEF mode switch will be blinkingduring the diagnostic sensor check.SWITCHSWITCH NAMECODESWITCH NAMECODESWITCH NAMECODELEDINDICATOR NAME CODEINDICATOR NAME CODEINDICATOR NAME CODE
AC–17AIR CONDITIONING SYSTEM–TROUBLESHOOTINGWarning for A/C compressor lockIf compressor lock occurs during air conditioning operation,the [A/C] switch indicator on the air conditioning control assembly starts blinking.When this occurs, check for compressor lock using paneldiagnosis check then proceed to inspect the circuit or thecomponent.Compressor lock sensor circuit page AC–38LIST OF OPERATION METHODSBy operating each of the air conditioning control switches as shown in the diagram below, it is possible toenter the diagnosis check mode.Turn ignition switch ON with AUTO andswitches held down.If both Auto switch andnot pressed at the same time.switch areIndicator CheckDiagnosticSensor Check(continuous operation)Actuator Check(continuousoperation)DiagnosticSensor Check(stepped operation)Cancel check mode and can startconditioning control: Indicates a switch operation
AC–18AIR CONDITIONING SYSTEM–TROUBLESHOOTINGINDICATOR CHECK1.Turn the ignition switch on while pressing the air conditioningcontrol AUTO switch and R/F SW simultaneously.2.Check that all the indicators light up and go off at 1second intervals 4 times in succession.HINT: After the indicator check is ended, the diagnostic sensorcheck begins automatically. Press the OFF switch when cancelling the check mode.DIAGNOSTIC SENSOR CHECK1.2.Perform an indicator check. After the indicator check iscompleted, the system enters the diagnostic sensor checkmode automatically.Check the LED blinking on the panel. Refer to the list of codeson page AC–20 when translating the trouble code from theLED blinking.If the slower display is desired, press the RDEF switch andchange it to step operation. Each time the RDEF switch ispressed, the blinking LED changes by 1 step.CLEARING TROUBLE CODES’ MEMORY1.2.Method 1:Pull out the ECU–B fuse in Junction Block No. 1 for 10 sec.or longer to clear the trouble codes’ memory.After reinserting the fuse, check that the normal code isoutput.Method 2:Press the RDEF switch while pushing the A/C switch duringthe sensor check mode.
AC–19AIR CONDITIONING SYSTEM–MEMO––TROUBLESHOOTING
AC–20AIR CONDITIONING SYSTEM–TROUBLESHOOTINGSENSOR CHECK TROUBLE CODE CHARTIf a LED is blinking during the diagnostic sensor check, check the circuit listed for the code in the table below(Proceed to the page given for that �ÑÑNo.Blinking LEDDetecting Condition0L–AUTO Normal1L–FACE*1 Open or short in room temperature sensor circuit.2L–B/L Open or short in ambient temperature sensor circuit.3L–FOOT Open or short in evaporator temperature sensor circuit.4L–F/D*2 Open or short in engine coolant temperature sensor circuit.5L–DEF*LDEF*36L–A/C*47L–FRS Open in pressure sensor circuit. Abnormal refrigerant pressure8L–REC Short to ground or power source circuit in air mix damper position sensor circuit.9L–LO Short to ground or power source circuit in air outlet damper position sensor circuit.10L–M2 Air mix damper position sensor value does not change even if A/C amplifier signals the11L–HI Air outlet damper position sensor value does not change even if A/C amplifier signals theHINT: Open in solar sensor circuit. Short in solar sensor circuit. All conditions below are detected for 3 secs. or more.(a) Engine speed 450 rpm or more.(b) Ratio between engine and compressor rpm deviates 20% or more in comparison to normal operation.[ below 196 kPa (2.0 kgf/cm2, 28 psi)over 3,140 kPa (32.0 kgf/cm2, 455 psi) ]air mix damper control servo motor to operate.air outlet damper control servo motor to operate.*1 If the room temp. is approx. –20 C (–4 F) or lower, FACE light may blink even though thesystem is normal.*2 If the ambient temperature is approx. –50 C (–58 F) or lower, the B/L light may blink eventhough the system is normal.*3 If the check is being performed in a dark place, the LED for DEF (solar sensor circuit abnormal)could be blinking.In this case, perform diagnostic sensor check again while shining a light, such as an inspectionlight, on the solar sensor.If the light is still blinking, there could be trouble in the solar sensor circuit.
AC–21AIR CONDITIONING SYSTEM–TROUBLESHOOTINGTrouble Area Memory*5Room temp. sensorHarness or connector between room temp. sensor and A/C amplifierSee page(8.5 min. or more)AC–28(8.5 min. or more)AC–30(8.5 min. or more)AC–32(8.5 min. or more)AC–34A/C amplifierAmbient temp. sensorHarness or connector between ambient temp. sensor and A/C amplifierA/C amplifierEvaporator temp. sensorHarness or connector between evaporator temp. sensor and A/C amplifierA/C amplifier Engine coolant temp. sensor Harness or connector between coolant temp. sensor and A/C amplifier A/C amplifier Solar sensor Harness or connector between sensor and A/C amplifier A/C amplifierAC–36(8.5 min. or more) Compressor drive belt Compressor lock sensor Compressor Harness and connector between A/C amplifier and compressor, compressorAC–38lock sensor A/C amplifier Pressure switch Harness or connector between pressure switch and A/C amplifier Refrigerant pipe line A/C amplifier Air mix damper position sensor A/C amplifier Harness or connector between air mix damper position sensor and A/C amplifier Air outlet damper position sensor A/C amplifier Harness or connector between max cool damper position sensor and A/C amplifier Air mix damper control servo motor Air mix damper position sensor Harness and connector between A/C amplifier and air mix position sensor Harness and connector between A/C amplifier and air mix damper controlservo motorHINT:(1 min. or more)(1 min. or more)AC–42AC–48(15 secs. or more)AC–42AC–44(15 secs. or more)AC–48AC–50 A/C amplifier Air outlet damper control servo motor Air outlet damper position sensor Harness and connector between A/C amplifier and air outlet position sensor Harness and connector between A/C amplifier and air outlet damper motor A/C amplifierAC–40*4 Compressor lock (A/C light blink) is indicated only for a current malfunction. (See page AC–38)To confirm the trouble indication, perform the following steps.(1) With the engine ON, enter the trouble code check mode.(2) Press the R/F switch to enter actuator check mode, and set the operation to Step No. 3.(3) Press the AUTO switch to return to diagnostic sensor check mode.(4) The A/C light starts to blink after approx. 3 secs.*5 The A/C amplifier memorizes the trouble code of the respective malfunction when it occursfor period of time indicated in the brackets.
AC–22AIR CONDITIONING SYSTEM–TROUBLESHOOTINGACTUATOR CHECK1.2.Step No.SetTemperature C ( F)After entering the sensor check mode, press the R/F switch.Turn the temperature set dial and change it to step operation.Each time the dial is turned, the actuator operation changesby 1 step.HINT: Check the change of actuator operation visually and byhand. To cancel the check mode, press the OFF switch.ConditionsBlowerMotorAir FlowventAir InletdamperMagneticclutchAir mixdamper
AC–23AIR CONDITIONING SYSTEM–TROUBLESHOOTINGA C AMPLIFIER TERMINAL STANDARD onditionStandard Value
AC–24AIR CONDITIONING –TROUBLESHOOTINGCondition* After 15 minutes, ON mode will change to OFF mode automatically.Standard Value
AC–25AIR CONDITIONING SYSTEM–MEMO––TROUBLESHOOTING
AC–26AIR CONDITIONING SYSTEM–TROUBLESHOOTINGMATRIX CHART OF PROBLEM SYMPTOMSAir Flow ControlNo blower operationTemperature ControlWhole functions of the A/C system does not operate.No cool air comes outNo blower controlInsufficient air flowNo warm air comes outOutput air is warmer or colder than the settemperature or response is slowNo temperature control(only Max. cool or Max. warm)No air inlet controlNo air outlet controlEngine idle up does not occur, or is continuousBlinking of A/C indicatorTrouble code not recorded.Set mode is cleared when IG switch is turned off.AC–50Air outlet damper controlservo motor circuitAC–48Air outlet damper positionsensor circuitAC–46servo motor circuitAir inlet damper controlAC–44servo motor circuitAir mix damper controlAC–42sensor circuitAir mix damper positionAC–40AC–38Compressor lock sensorPressure switch circuitAC–36Solar sensor circuitcircuitAC–34Engine coolant temp. sensorcircuitAC–32circuitEvaporator temp. sensorAC–30SymptomAmbient temp. sensorcircuitSuspect AreaAC–28See pageRoom temp. sensor circuitIf a normal code is displayed during the diagnostic sensor check but the trouble still occurs, perform troubleshooting for each problem symptom, checking the circuits for each symptom in the order given in the tablebelow (Proceed to the page given for each circuit).
r radiatorExpansion valveWater valveAC–71Refrigeration system inspectionwith manifold gauge setReceiverIN–35A/C amplifierAC–92AC–69Temperature set dial circuitCondenserAC–66A/C control assembly circuitAC–107AC–62Compressor circuitElectric cooling fanAC–60Blower motor circuitAC–77AC–58Heater relay circuitDrive belt tensionAC–56ACC power source circuitAC–76AC–54IG power source circuit–Refrigerant volumeAC–52Backup power sourcecircuitAIR CONDITIONING SYSTEMTROUBLESHOOTINGAC–27HINT: If the instruction ”Proceed to next circuit inspection shown on matrix chart is given in the flow chartfor each circuit, proceed to the circuit with the next highest number in the table to continue the check. If the trouble still reappears even though there are no abnormalities in any of the other circuits, thencheck or replace the A/C amplifier.
AC–28AIR CONDITIONING SYSTEM–TROUBLESHOOTINGCIRCUIT INSPECTIONBlinking Light FACE Room Temperature Sensor CircuitCIRCUIT DESCRIPTIONThis sensor detects the temperature inside the cabin and sends the appropriate signals to the A/C amplifier.Diagnostic Sensor Check Detecting ConditionOpen or short in room temperature sensor circuit.Trouble Area Room temperature sensor Harness or connector between room temperaturesensor and A/C amplifier A/C amplifier
AC–29AIR CONDITIONING SYSTEM–TROUBLESHOOTINGINSPECTION PROCEDURECheck voltage between terminals TR and SG of A/C amplifier connector.Remove A/C amplifier with connectors still connected.1.2.Turn ignition switch ON.Measure voltage between terminal TR of SGof A/C amplifier connector at each temperature.Voltage:at 25 C (77 F): 1.8 2.2 Vat 40 C (104 F): 1.2 1.6 VHINT: As the temperature increases, the voltage decreasesgradually.Proceed to next circuit inspection shown on matrixchart (See page AC–26). However, if the light is stillblinking, check and replace A/C amplifier.Check room temperature sensor.1.2.Remove instrument panel.Disconnect room temperature sensor connector.Check resistance between terminals 1 and 2 of roomtemperature sensor connector.Resistance:at 25 C (77 F):1.6 1.8 k Replace room temperature sensor.Check harness and connector between A/C amplifier and roomtemperature sensor (See(SeePagepageIN–30pageIN–30).IN–30). ).Repair or replace harness or connector.Check and replace A/C amplifier.
AC–30AIR CONDITIONING SYSTEM–TROUBLESHOOTINGBlinking Light B L Ambient Temperature Sensor CircuitCIRCUIT DESCRIPTIONThis sensor detects the ambient temperature and sends the appropriate signals to the A/C amplifier.Diagnostic Sensor Check Detecting ConditionOpen or short in ambient temperature sensor circuit.Trouble Area Ambient temperature sensor Harness or connector between ambient tempera–ture sensor and A/C amplifier A/C amplifier
AC–31AIR CONDITIONING SYSTEM–TROUBLESHOOTINGINSPECTION PROCEDURECheck voltage between terminals TAM and SG of A/C amplifier connector.Remove A/C amplifier with connectors still connected.1.2.Turn ignition switch ON.Measure voltage between terminal TAM of SGof A/C amplifier connector at each temperature.Voltage:at 25 C (77 F): 1.35 1.75 Vat 40 C (104 F): 0.85 1.25 VHINT: As the temperature increases, the voltage decreasesgradually.Proceed to next circuit inspection shown on matrixchart (See pageAC–26).However, if the light is still(See pageAC–26)blinking, check and replace A/C amplifier.Check ambient temperature sensor.1.2.Remove the clip and the sensor from the rightside inside the bumper reinforcement.Disconnect ambient temperature sensor connec–tor.Check resistance between terminals 1 and 2 of ambient temperature sensor connector at each temperature.Resistance:at 25 C (77 F): 1.6 1.8 k at 50 C (122 F): 0.5 0.7 k HINT: As the temperature increases, the resistancedecreases gradually.NOTICE:When installing the ambient temperature sensor,be sure to connect the sensor connector beforeconnecting the battery.Replace ambient temperature sensor.Check harness and connector between A/C amplifier and ambientIN–30).temperature sensor (See(SeepagepageIN–30).Repair or replace harness or connector.Check and replace A/C amplifier.
AC–32AIR CONDITIONING SYSTEM–TROUBLESHOOTINGBlinking Light FOOT Evaporator Temperature Sensor CircuitCIRCUIT DESCRIPTIONThis sensor detects the temperature inside the cooling unit and sends the appropriate signals to theA/C amplifier.Diagnostic Sensor Check Detecting ConditionOpen or short in evaporator temperature sensorcircuit.Trouble Area Evaporator temperature sensor Harness or connector between evaporatortemperature sensor and A/C amplifier A/C amplifier
AC–33AIR CONDITIONING SYSTEM–TROUBLESHOOTINGINSPECTION PROCEDURECheck voltage between terminals TE and SG of A/C amplifier connector.Remove A/C amplifier with connectors still connected.1.2.Turn ignition switch ON.Measure voltage between terminal TE of SGof A/C amplifier connector at each temperature.Voltage:at 0 C (32 F): 2.0 2.4 Vat 15 C (59 F): 1.4 1.8 VHINT: As the temperature increases, the voltage decreasesgradually.Proceed to next circuit inspection shown on matrix(SeeAC–26).page AC–26).chart (See pageHowever, if the light is stillblinking, check and replace A/C amplifier.Check evaporator temperature sensor.Remove evaporator temperature sensor (See pageAC–106)Check resistance between terminals 1 and 2 of evaporator temperature sensor connector at each temperature.Resistance:at 0 C (32 F): 4.5 5.2 k at 15 C (59 F): 2.0 2.7 k HINT: As the temperature increases, the resistancedecreases gradually.Replace evaporator temperature sensor.Check harness and connector between A/C amplifier and evaporatorIN–30).temperature sensor (SeepageIN–30)(See pageRepair or replace harness or connector.Check and replace A/C amplifier.
AC–34AIR CONDITIONING SYSTEM–TROUBLESHOOTINGBlinking Light F D Engine Coolant Temperature Sensor CircuitCIRCUIT DESCRIPTIONThis sensor detects the coolant temperature and sends the appropriate signals to the A/C amplifier.These signals are used for warm up control when the engine is cold.Diagnostic Sensor Check Detecting ConditionOpen or short in engine coolant temperature sensorcircuit.Trouble Area Engine coolant temperature sensor Harness or connector between engine coolanttemperature sensor and A/C amplifier A/C amplifier
AC–35AIR CONDITIONING SYSTEM–TROUBLESHOOTINGINSPECTION PROCEDURECheck voltage between terminals TW and SG of A/C amplifier connector.Remove A/C amplifier with connectors still connected.1.2.Turn ignition switch ON.Measure voltage between terminal TW of SGof A/C amplifier connector at each temperature.Voltage:at 0 C (32 F): 2.8 3.2 Vat 40 C (104 F): 1.8 2.2 Vat 70 C (158 F): 1.3 1.5 VHINT: As the temperature increases, the voltage decreasesgradually.Proceed to next circuit inspection shown on matrix(See pageAC–26).chart (See pageAC–26).However, if the light is stillblinking, check and replace A/C amplifier.Check engine coolant temperature sensor.1.2.Remove A/C unit (See page AC–80).Remove engine coolant temperature sensor.Measure resistance between terminals 1 and 2 of engine coolant temperature sensor connector at eachtemperature.Resistance:at 0 C (32 F):Below 50 k at 40 C (104 F): 2.4 2.8 k at 100 C (212 F): Over 0.2 k HINT:As the temperature increases, the resistancedecreases gradually.Replace engine coolant temperature sensor.Check harness and connector between A/C amplifier and engine coolanttemperature sensor (See(SeepagepageIN–30)IN–30).Repair or replace harness or connector.Check and replace A/C amplifier.
AC–36AIR CONDITIONING SYSTEM–TROUBLESHOOTINGBlinking Light DEF Solar Sensor CircuitCIRCUIT DESCRIPTIONA photo diode in the solar sensor detects solar radi–ation and sends signals to the A/C amplifier.Diagnostic Sensor Check Detecting ConditionOpen or short in solar sensor circuit.Please not that blinking of the LED for DEF is notabnormal when the sensor is not receiving solarradiation.Trouble Area Solar sensor Harness or connector between solar sensor andA/C amplifier A/C amplifier
AC–37AIR CONDITIONING SYSTEM–TROUBLESHOOTINGINSPECTION PROCEDURECheck voltage between terminals S5 and TS of A/C amplifier connector.Remove A/C amplifier with connectors still connected.1.2.Turn ignition switch ON.Measure voltage between terminal S5 of TSof A/C amplifier connector when the solar sensoris subjected to an electric light, and when the sen–sor is covered by a cloth.ConditionSensor covered by a clothSensor subjected to electric lightHINT:Voltage0.8 4.3 VBelow 0.8 VAs the inspection light is gradually moved awayfrom the sensor, the voltage increases.Proceed to next circuit inspection shown on matrixchart (See page AC–26). However, if the light is stillblinking, check and replace A/C amplifier.Check solar sensor.1.2.Remove glove compartment assembly.Remove solar sensor.1.2.Cover the sensor by a cloth.Measure resistance between terminals 1 and 2 ofsolar sensor connector.Connect positive ( ) lead of ohmmeter to terminal 2and negative (–) lead to terminal 1 of the solar sensor.Resistance: (no continuity)1.2.Remove the cloth from the solar sensor and sub–ject the sensor to electric light.Measure resistance.Resistance: Approx. 4k (continuity)HINT:As the electric light is moved gradually away fromthe sensor, the resistance increases.Replace solar sensor.Check harness and connector between A/C amplifier and solar sensor(SeepagepageIN–30IN–30)).(SeeRepair or replace harness or connector.Check and replace A/C amplifier.
AC–38AIR CONDITIONING SYSTEM–TROUBLESHOOTINGBlinking Light A C Compressor Lock Sensor CircuitCIRCUIT DESCRIPTIONThis sensor sends 1 pulse per engine revolution to the A/C amplifier. If the number ratio of the compressor speed divided by the engine speed is smaller than a predetermined value, the A/C amplifier turnsthe compressor off. And, the indicator flashes at about 1 second intervals.Diagnostic Sensor Check Detecting ConditionAll conditions below are detected for 3 secs. or more(a) Engine speed: 450 rpm or more(b) Ratio between engine and compressor speeddeviates 20% or more in comparison to normaloperation.Trouble Area Compressor Compressor drive belt Compressor lock sensor Harness and conn
2. USE OF PROPER COMPRESSOR OIL Compressor oil used in conventional CFC12 air conditioning systems cannot be used in HFC134a air conditioning sys-tems. Always use genuine Toyota R134a air conditioning oil ND– OIL 8, made expressly for use with HFC134a. NOTICE: Compressor oil
Evacuate and Charge the Air Conditioning System (A7-E-4) 30 Chapter 15 - A/C System Diagnosis and Service Air Conditioning System Performance Test (A7-A-1, A7-A-3) 31 Air Conditioning Noise Diagnosis (A7-A-4) 32 Refrigerant Identification/Read Pressures (A7-A-5) 33 Leak Test the Air Conditioning System (A7-A-6) 34
The winter air conditioning uses a heat pump (refrigeration system operated in the reverse direction) and a humidifier. Depending upon the comfort of the human beings and the control of environment for the industrial products and processes, air conditioning can also be classified as comfort air conditioning and industrial air conditioning. .
Differences Between Classical and Operant Conditioning (see table 5.5, page 228) Classical Conditioning Operant Conditioning In classical conditioning, the organism learns an association between two stimuli—the CS and UCS (eg. food and tone)—that occurs before the behavior (eg. salivation). In operant conditioning, the organism learns an
February 2 EQ- How does operant Agenda: conditioning work? SSPBC1 1.Daily Sheet 2.Review Classical Conditioning (Ex. From real life) 3.Operant Conditioning (notes, video, lab) 4. Practice Table of Contents: 93. Classical Conditioning Elements 94. Operant Conditioning Notes 95. OC Worksheet HW- Programmed Unit Assignment Consciousness HW Folders .
design an air conditioning system for a shopping mall with proper distribution of air and also separate energy consumption system for different vendors. Keywords:HVAC, Air-Conditioning,Refrigeration, HACR. I. INTRODUCTION HVAC (heating, ventilating, and air conditioning; also heating, ventilation, and air conditioning) is the technology
Classical Conditioning & Operant Conditioning. What is Classical Conditioning? HowDoWeLearn? ClassicalConditioning § § § Pavlov’sExperiments ExtendingPavlov’sUnderstanding Pavlov’sLegacy 2 Learning Objective: Students will be able to describe the difference between Classical and Operant Conditioning.
Air conditioning and cooling as a unit Although air conditioning and engine cooling are two separate systems, they do affect each other. When the air conditioning is in use, there is a heavier load on the engine cooling system and the coolant temperature rises. The additives in the coolant not only protect against frost, but
Academic writing is cautious, because many things are uncertain. When we put forward an argument, point of view or claim, we know that it can probably be contested and that not everybody would necessarily agree with it. We use words and phrases that express lack of certainty, such as: Appears to Tends to Seems to May indicate Might In some .
