Page 49 of 4087
OPERATION OF DAMPERS
AC±8±
AIR CONDITIONING SYSTEM Description
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Page 50 of 4087
CONTROL FUNCTIONS
Interior Room Temperature Control System
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor, evaporator temperaturesensor and solar sensor) and the temperature setting, the air conditioner con\
trol ECU determines the air
flow volume and outputs signals to the air mix servomotor.
(c) When it receives signals from the ECU, the air mix servomotor opens or close\
s the air mix damper to change the air flow temperature. When the temperature reaches the specified te\
mperature, it is detected
by the air mix damper position sensor and the ECU stops the servomotor.
HINT: If the desired temperature setting is 65 °F, the ECU forcedly sets the air mix damper to the Max Cool posi-
tion. If it is set at 85 °F, the ECU forcedly sets the air mix damper to the Max Hot position.
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AIR CONDITIONING SYSTEM DescriptionAC±9
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Page 51 of 4087
Blower Fan Speed Control System
(When AUTO Switch is ON)
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor and solar sensor) and thetemperature setting, the air conditioner control ECU determines the air flow volume\
and outputs signals
to the power transistor.
(c) When it receives signals from the ECU, the power transistor increases or red\
uces the blower motor speed to control the air flow volume.
(When AUTO Switch is OFF)
The ECU turns the power transistor increasing or reducing the blower mot\
or speed fixing the air flow volume
in accordance with the position of the Manual switch. AC±10
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AIR CONDITIONING SYSTEM Description
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Page 52 of 4087
Air Flow Mode Control System
(When the AUTO Switch is ON)
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor and solar sensor) and thetemperature setting, the air conditioner control ECU determines the air flow mode a\
nd outputs signals to
the mode servomotor and max cool servomotor.
(c) When it receives signals from the ECU, the servomotors open or close each of\
the dampers to change the air flow mode.
(When the AUTO Switch is OFF)
The ECU fixes the air flow mode in accordance with the Manual switch pos\
ition.
(When the Engine is Cold)
If the Mode is set on B/L or FOOT, the ECU forcedly changes the air vent to DEF if cold signals are input from
the water temperature sensor.
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AIR CONDITIONING SYSTEM DescriptionAC±11
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Page 53 of 4087
Air Inlet Control System
(When the AUTO Switch is ON)
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor and solar sensor) and thetemperature setting, the air conditioner control ECU determines the air \
inlet and outputs signals to the air
inlet servomotor assembly.
(c) When it receives signals from the ECU, the air inlet servomotor opens or clo\
ses the damper to change the air inlet. When the air inlet is changed to the desired setting, it is detected by the air inlet damper p\
osition
sensor and the ECU stops the servomotor.
HINT: If the Mode switch is set on DEF, the ECU forcedly changes the air inlet to FRS.
(When the AUTO Switch is OFF)
The ECU fixes the air inlet according to the position of the manual swit\
ch. AC±12
±
AIR CONDITIONING SYSTEM Description
WhereEverybodyKnowsYourName
Page 54 of 4087
Part No.Part NameNote
07110-58011
(07117-58010)
(07117-78011)
(07117-88013)
(07117-88022)
(07117-88040)
07110-58040
07112-66040
07112-76060
07114-82020
07117-48050
Air Conditioner
Service Tool Set
(Refrigerant Drum
Service Valve)
(Refrigerant
Charging Gauge)
(Refrigerant
Charging Hose)
(Refrigerant
Charging Hose)
(Refrigerant
Charging Hose)
(Stop Valve)
Charging Hose Kit.
w/Stop Valve
Magnetic Clutch
Stopper
Magnetic Clutch
Remover
Snap Ring Pliers
Vacuum Pump Assy
Orange Color
If you require a stop valve, please order this kit.
Rated voltage AC220V
Illustration
IllustrationPart No.Part NameNote
09082-00015TOYOTA
Electrical TesterMeasure voltage currant and resistance
Blue Color
Green Color
PREPARATION
SST (SPECIAL SERVICE TOOLS)
±
AIR CONDITIONING SYSTEM PreparationAC±13
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Page 55 of 4087
EQUIPMENT
Part Name\
\
Note
Voltmeter\
\
\
Measures voltage
Ammeter
\
\
\
Measures current
Ohmmeter\
\
Measures resistance
LUBRICANT
ItemCapacityClassificationItemccfl. ozClassification
Compressor oil
When replacing receiver
When replacing condenser
When replacing evaporator
20
40±50
40±500.7
1.4±1.7
1.4±1.7
ND OIL 6,
SUNISO No. 5GS or equivalent
AC±14±
AIR CONDITIONING SYSTEM Preparation Cooling System
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Page 56 of 4087

USE OF MANIFOLD GAUGE SET
INSTALLATION OF MANIFOLD GAUGE
SET
HINT: To prevent releasing refrigerant, use charging hoses
with a stop valve when installing the manifold gauge set to
service valves on the refrigerant line.
1. CONNECT CHARGING HOSES WITH A STOP VALVE TO MANIFOLD GAUGE SET
Tighten the nuts by hand.
CAUTION:
wDo not connect the wrong hoses to the high
pressure and the low pressure sides.
w To prevent loosening the nuts, do not apply
compressor oil to seat of the connection.
2. CLOSE HAND VALVES OF BOTH STOP VALVES
3. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE SET
4. REMOVE CAPS FROM SERVICE VALVES ON REFRIGERANT LINE
5. CONNECT STOP VALVES TO SERVICE VALVES Tighten the nuts by hand.
CAUTION:
wDo not connect the wrong hoses to the high
pressure and the low pressure sides.
w To prevent loosening the nuts, do not apply
compressor oil to seat of the connection.
6. OPEN HAND VALVES OF BOTH STOP VALVES
REMOVAL OF MANIFOLD GAUGE SET
1. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE SET
2. CLOSE HAND VALVES OF BOTH STOP VALVES
3. DISCONNECT STOP VALVES FROM SERVICE VALVES ON REFRIGERANT LINE
4. INSTALL CAPS TO SERVICE VAL VES ON REFRIGERANT
LINE
±
AIR CONDITIONING SYSTEM Use of Manifold Gauge SetAC±15
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