Air Conditioning System (Auto A/c) (Diagnostics - Introduction): Overview Scion FR-S I

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1. IGNITION SWITCH EXPRESSIONS The type of ignition switch used on this model differs according to the specifications of the vehicles. The expressions listed in the table below are used in this information. Expression Ignition Switch (Position) Engine Switch (Condition) Ignition Switch off LOCK Off (Lock) Ignition Switch ACC ACC On (ACC) Ignition Switch ON ON On (IG) Engine Start START ON (Start)
2. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME TEXT IN ILLUSTRATION *a Charging Cylinder
3. ALWAYS WEAR EYE PROTECTION
4. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin: Wash the area with lots of cold water. WARNING: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a hospital or see a physician for professional treatment.
5. NEVER HEAT CONTAINER OR EXPOSE THE CONTAINER TO AN OPEN FLAME
6. BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
7. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the A/C system, oil lubrication will be insufficient and the compressor may be damaged. Necessary care should be taken to avoid this.
8. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING Open and close only the low pressure valve. If the high pressure valve is opened, refrigerant flows in the reverse direction causing the charging cylinder to rupture. TEXT IN ILLUSTRATION *a Wrong *b Okay
9. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If the system is overcharged with refrigerant, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.
10. DO NOT OPERATE ENGINE AND COMPRESSOR WITH NO REFRIGERANT WARNING: Doing so may damage inside the compressor because the compressor parts always move regardless of whether the A/C system is turned on or off.
11. SUPPLEMENTAL RESTRAINT SYSTEM (SRS) This vehicle is equipped with a Supplemental Restraint System (SRS) such as the driver, front passenger, side, and curtain shield airbags. Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices. Refer to «PRECAUTION [12/2013 - ]»(ref-612421-S24190999222014042900000) .
12. GENERAL PRECAUTION While using the battery during inspection, do not bring the positive (+) and negative (-) tester probes too close to each other as a short circuit may occur.

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COMMUNICATION TABLE

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1. GENERAL The air conditioning system has the following controls. Control Outline Outlet Air Temperature Control In compliance with the temperature set at the temperature control dial, the air conditioning control assembly calculates the outlet temperature based on the input signals from various sensors. In addition, corrections in accordance with the signals from the evaporator temperature sensor (No. 1 cooler thermistor) and E.F.I. engine coolant temperature sensor are added to control the outlet air temperature. The temperature setting for the driver and front passenger is controlled independently in order to provide a separate vehicle interior temperature for the right and left side of the vehicle. Thus, air conditioning control that accommodates occupant preferences has been realized. Blower Control Controls the blower motor with fan sub-assembly in accordance with the airflow volume that has been calculated by the air conditioning control assembly based on the input signals from various sensors. Air Inlet Control Automatically controls the No. 1 air conditioning radiator damper servo sub-assembly in accordance with the outlet temperature that has been calculated by the air conditioning control assembly. Drives the No. 1 air conditioning radiator damper servo sub-assembly according to the operation of the air inlet control switch and moves the dampers to the FRESH or RECIRC position.
2. MODE POSITION AND DAMPER OPERATION Mode Position and Damper Operation TEXT IN ILLUSTRATION *1 Air Inlet Control Door *2 Recirculated Air *3 Fresh Air *4 Blower Motor with Fan Sub-assembly *5 No. 1 Cooler Evaporator Sub-assembly *6 Air Mix Control Door *7 Side Register *8 Center Register *9 Footwell Register Duct *10 Mode Control Door *11 Front Defroster, Side Defroster *12 Heater Radiator Unit Sub-assembly *13 Front Passenger Side *14 Driver Side FUNCTIONS OF MAIN DAMPERS Control Damper Operation Position Damper Position Operation Air Inlet Control Damper FRESH A Brings in fresh air. RECIRCULATION B Recirculates internal air. Air Mix Control Damper MAX COLD to MAX HOT Temperature Setting C - D (C' - D') Varies the mixture ratio of warm air and cool air in order to regulate the temperature continuously between hot and cold. Mode Control Damper FACE E, H, Air blows out of the center register and side register ducts. BI-LEVEL F, H Air blows out of the center register side register and footwell register ducts. FOOT G, I Air blows out of the footwell register and side registers ducts. In addition, air blows out slightly from the front defroster and side defrosters. FOOT AND DEFROSTER G, J Defrosts the windshield through the front defroster, side defroster, and side registers ducts., while air is also blown out from the footwell register ducts. DEFROSTER G, K Defrosts the windshield through the front defroster, side defrosters, and side registers ducts.
3. AIR OUTLETS AND AIRFLOW VOLUME Air Outlets and Airflow Volume Indication Mode FACE Footwell Defroster CTR SIDE FRONT SIDE A B C D E FACE BI-LEVEL FOOT FOOT AND DEFROSTER DEFROSTER The size of each circle o indicates the ratio of airflow volume.
4. COMPRESSOR General: A compact and high performance scroll compressor with has been adopted. The scroll compressor with oil separator consists of a spirally wound fixed scroll and rotating scroll that from a pair, and oil separator, and a magnetic clutch. The fixed scroll is integrated with the housing. Because the rotation of the shaft causes the rotating scroll to revolve while maintaining the same posture, the volume of the space that is partitioned by both scrolls varies to perform the suction, compression, and the discharge of the refrigerant gas. A pin is attached behind the rotating scroll to prevent the autorotation of the rotating scroll, allowing it only to revolve. Locating the suction port directly above the scrolls enables direct suction, thus realizing improved suction efficiency. Containing a built-in oil separator, this compressor is able to separate the compressor oil that is intermixed with the refrigerant and circulates in the refrigeration cycle, thus realizing a reduction in the oil circulation rate. TEXT IN ILLUSTRATION *1 Fixed Scroll *2 Rotating Scroll *3 Pins *4 Shaft *5 Discharge Port - - A CS (Centrifugal with Shutter) type oil separator has been adopted to reduce the circulation rate of the compressor oil that is intermixed with the refrigerant and circulates in the refrigeration cycle. This oil separator is provided with a cylindrical pipe in the separator case, enabling the refrigerant gas that has been discharged through the discharge gas inlet to be separated into refrigerant gas and oil through centrifugal force, and minimizing the outflow of the oil to the discharge service port. As a result, the oil circulation rate has been reduced and makes energy savings possible. TEXT IN ILLUSTRATION *1 Cooler Condenser Assembly and Modulator *2 Cooler Expansion Valve *3 Refrigerant Gas + Compressor Oil *4 No. 1 Cooler Evaporator Sub-assembly *5 Oil *6 Compressor Assembly *7 Oil Separator - - *a Oil Circulation Ratio of 4% *b Oil Circulation Ratio of 1% Compressor Operation As the capacity of the compression chamber, which is created between the rotating scroll and the fixed scroll, increases in accordance with the revolution of the rotating scroll, refrigerant gas is drawn in from the intake port. From the state at which the suction process has been completed, as the revolution of the rotating scroll advances further, the capacity of the compression chamber decreases gradually. Consequently, the refrigerant gas that has been drawn in becomes compressed gradually and is sent to the center of the fixed scroll. The compression of the refrigerant gas is completed when the rotating scroll completes approximately 2 revolutions. When the compression of the refrigerant gas is completed and the refrigerant pressure becomes high, the refrigerant gas discharges through the discharge port located in the center of the fixed scroll by pushing the discharge valve. TEXT IN ILLUSTRATION *1 Suction *2 Discharge *3 Compression *4 Discharge Port *5 Rotating Scroll *6 Fixed Scroll *7 Intake port - - The refrigerant gas that is discharged from the discharge port flows by rotating around the cylindrical pipe in the oil separator. At this time, the centrifugal force that is created during the rotation separates the refrigerant gas and the compressor oil due to the difference in their specific gravity. The refrigerant gas with the lighter specific gravity passes through the inside of the pipe and travels from the discharge service port to the outside of the compressor. The compressor oil with the heavier specific gravity is discharged through the oil discharge hole in the shutter and is stored in the oil storage chamber. Then, the compressor oil is fed again into the compressor and circulates inside the compressor. TEXT IN ILLUSTRATION *1 Refrigerant *2 Shutter *3 Refrigerant and Compressor Oil *4 Compressor Oil *5 Valve Chamber D *6 Service Port *7 Pipe *8 Case *9 Oil Discharge Hole *10 Oil Storage Chamber
5. EVAPORATOR TEMPERATURE SENSOR (NO. 1 COOLER THERMISTOR) The evaporator temperature sensor (No. 1 cooler thermistor) detects the temperature of the cooled air immediately past the evaporator in the form of resistance changes, and outputs this data to the air conditioning control assembly.
6. BLOWER MOTOR CONTROL The blower motor control has internal circuitry that uses electrical current to change the signal from the air conditioning control assembly and to change the speed of the blower motor with fan sub-assembly. TEXT IN ILLUSTRATION *1 Blower Motor Control *2 TEMPERATURE Fuse *a To Air Conditioning Control Assembly *b To Blower Motor with Fan Sub-assembly
7. SERVO MOTOR A No. 1 air conditioning radiator damper servo sub-assembly (air inlet), No. 3 air conditioning radiator damper servo sub-assembly (air outlet), No. 4 air conditioning radiator damper servo sub-assembly (air mix (for front passenger side)), and No. 5 air conditioning radiator damper servo sub-assembly (air mix (for driver side)) have been adopted. TEXT IN ILLUSTRATION *1 No. 5 Air Conditioning Radiator Damper Servo Sub-assembly (Air Mix (For Driver Side)) *2 No. 3 Air Conditioning Radiator Damper Servo Sub-assembly (Air Outlet) *3 No. 4 Air Conditioning Radiator Damper Servo Sub-assembly (Air Mix (For Front Passenger Side)) *4 No. 1 Air Conditioning Radiator Damper Servo Sub-assembly (Air Inlet) The No. 1 air conditioning radiator damper servo sub-assembly (air inlet) receives an activation signal from the air conditioning control panel for its internal/fresh air select switch, whereupon it causes motor rotation and opens or closes the internal/fresh air door through a link. TEXT IN ILLUSTRATION *1 Recirculated Air *2 Fresh Air *3 Internal air contact *4 Moving contact *5 Fresh air contact *6 Motor In the No. 3 air conditioning radiator damper servo sub-assembly (air outlet), the air conditioning control assembly causes the servo motor to rotate to a particular position due to action taken to change the mode of the air conditioning control assembly or by automatic control, causing the mode door to open or close through a link. The actual position of the mode door is measured by a potentiometer installed in the No. 3 air conditioning radiator damper servo sub-assembly (air outlet), and the change in resistance caused by the change in door position is fed back into the air conditioning control assembly as a change in voltage. TEXT IN ILLUSTRATION *1 FACE *2 B/L *3 FOOT *4 F/D *5 DEF *6 Potentiometer *7 Motor - - In the No. 4 air conditioning radiator damper servo sub-assembly (air mix (for front passenger side)) and No. 5air conditioning radiator damper servo sub-assembly (air mix (for driver side)), the air conditioning control assembly causes the servo motor to rotate to a particular position due to action taken to set the temperature or by automatic control, causing the air mix door to open or close through a link. The actual position of the air mix door is measured by a potentiometer installed in the No. 4 air conditioning radiator damper servo sub-assembly (air mix (for front passenger side)) and No. 5air conditioning radiator damper servo sub-assembly (air mix (for driver side)), and the change in resistance caused by the change in door position is fed back into the air conditioning control assembly as a change in voltage. TEXT IN ILLUSTRATION *1 Max Cool *2 Max Hot *3 Potentiometer *4 Motor
8. COOLER (ROOM TEMP. SENSOR THERMISTOR) The cooler (room temp. sensor) thermistor detects the room temperature based on changes in the resistance of its built-in thermistor.
9. AMBIENT TEMPERATURE SENSOR (THERMISTOR ASSEMBLY) The thermistor assembly detects the ambient temperature based on changes in the resistance of its built-in thermistor. This signal is used by the air conditioning control assembly.
10. AUTOMATIC LIGHT CONTROL SENSOR A single-unit light sensor has been adopted for the automatic light control sensor, reducing the part count. Changes in the amount of light are detected by the scanner (integrated optical sensor) and output to the air conditioning control assembly.
11. AIR CONDITIONING PRESSURE SWITCH The air conditioning pressure switch (air conditioner tube assembly) uses refrigerant pressure to output an on/off signal to the ECM to control the compressor with magnet clutch.