TOYOTA SUPRA 1997 Service Repair Manual
Page 111 of 1807
I01390
Condition: Insufficient cooling
I01392
Condition: Insufficient cooling
NOTE : These gauge indica-
tions are shown when the
refrigeration system has
been opened and the refrig-
erant charged without vacu-
um purging.
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-7
2155 Author: Date:
1997 SUPRA (RM502U)
(6) Refrigerant overcharged or insufficient cooling of
condenser
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
Pressure too high on both low
and high pressure sides
No air bubbles seen through the
sight glass even when the engine
rpm is lowered Unable to develop sufficient per-
formance due to excessive refrig-
eration system
Insufficient cooling of condenser Excessive refrigerant in
cycle " refrigerant over charged
Condenser cooling " condenser
fins clogged of condenser fan
faulty
(1) Clean condenser
(2) Check condenser fan motor
operation
(3) If (1) and (2) are in normal
state, check amount of refrigerant
Charge proper amount of refriger-
ant
(7) Air present in refrigeration system
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
Pressure too high on both low
and high pressure sides
The low pressure piping hot to
touch
Bubbles seen in sight glass
Air entered in refrigeration system
Air present in refrigeration sys-
tem
Insufficient vacuum purging
(1) Check compressor oil to see if
it is dirty or insufficient
(2) Evacuate air and charge new
refrigerant
Page 112 of 1807
I01450
Condition: Insufficient cooling
I01393
Condition : Does not cool AC-8
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
2156 Author: Date:
1997 SUPRA (RM502U)
(8) Expansion valve improperly
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
Pressure too high on both low
and high pressure sides
Frost or large amount of dew on
piping on low pressure side
Trouble in expansion valve
Excessive refrigerant in low
pressure piping
Expansion valve opened too
wide
Check expansion valve
Replace if defective
(9) Defective compression compressor
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
Pressure too high on low and
high pressure sides
Pressure too low on high pres-
sure side
Internal leak in compressor
Compression defective
Valve leaking or broken sliding
parts
Repair or replace compressor
Page 113 of 1807
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-9
2157 Author: Date:
1997 SUPRA (RM502U)
3. INSPECT IDLE-UP SPEED
(a) Warm up engine
(b) Inspect idle-up speed when the these conditions are es-
tablished.
Test conditions:
Blower speed control switch at ºHIº position
Temperature control dial at ºCOOLº position
A/C switch ON
Put gear shift in neutral
2JZ-GE (M/T)
Magnetic clutch conditionIdle-up speed
Not engaged700 ± 50 rpm
Engaged900 ± 50 rpm
If idle speed is not as specified, check the IAC valve and air in-
take system.
2JZ-GE (A/T)
Magnetic clutch conditionIdle-up speed
Not engaged700 ± 50 rpm
Egagedn800 ± 50 rpm
If idle speed is not as specified, check the IAC valve and air in-
take system.
2JZ-GTE
magnetic clutch conditionIdle-up speed
Not engaged650 ± 50 rpm
Engaged800 ± 50 rpm
If idle speed is not as specified, check the IAC valve and air in-
take system.
4. INSPECT FOR LEAKAGE OF REFRIGERANT
(a) Perform in these conditions:
Stop engine.
Secure good ventilation (If the gas leak detector
may not react to volatile gases which are not refrig-
erant, such as evaporated gasoline and exhaust
gas.)
Repeat the test 2 or 3 times.
Make sure that there is some refrigerant remaining
in the refrigeration system.
When compressor is OFF: approx. 392 - 588 kPa
(4 - 6 kgf/ cm
2, 57 - 85 psi)
Page 114 of 1807
N14519
Drain Hose AC-10
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
2158 Author: Date:
1997 SUPRA (RM502U)
(b) Bring the gas leak detector close to the drain hose before
performing the test.
HINT:
After the blower motor has stopped, leave the cooling unit
for more than 15 minutes.
Expose the gas leak detector sensor under the drain
hose.
When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not react to the
volatile gases.
If such reaction is unavoidable, the vehicle must be lifted up.
(c) If gas leak is not detected on the drain hose, remove the
blower resistor from the cooling unit. Then insert the gas
leak detector sensor into the unit and perform the test.
(d) Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch and perform the test.
(e) Bring the gas leak detector close to the refrigerant lines
and perform the test.
Page 115 of 1807
AC0Q1-01
N13793
Charging Cylinder High Pressure
Service Valve Low Pressure
Service ValvePush
Air
N13792
Gas Leak
Detector AC-12
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
2160 Author: Date:
1997 SUPRA (RM502U)
CHARGING
1. INSTALL CHARGING CYLINDER
HINT:
When handling the charging cylinder, always follow the direc-
tions given in the instruction manual.
(a) Charge the proper amount of refrigerant into the charging
cylinder.
(b) Connect the center hose to the charging cylinder.
CAUTION:
Do not open both high and low hand valves of manifold
gauge set.
(c) Open the valve of charging cylinder.
(d) Press the valve core on the side of manifold gauge and
expel the air inside of the center hose.
2. INSPECT REFRIGERATION SYSTEM FOR LEAKS
(a) Open the high pressure hand valve and charge refriger-
ant.
(b) When the low pressure gauge indicates 98 kPa
(1 kgf/cm
2, 14 psi) close the high pressure hand valve.
(c) Using a gas leak detector, check the system for leakage.
If leak is found, repair the faulty component or connection.
CAUTION:
Use the refrigerant recovery/ recycling machine to recover
the refrigerant whenever replacing parts.
Page 116 of 1807
N13790
Low Pressure
Service Valve
High Pressure
Service Valve
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-13
2161 Author: Date:
1997 SUPRA (RM502U)
3. CHARGE REFRIGERANT INTO REFRIGERANT SYS-
TEM
If there is no leak after refrigerant leak check, charge the proper
amount of refrigerant into refrigeration system.
CAUTION:
Never run the engine when charging the system
through the high pressure side.
Do not open the low pressure hand a valve when the
system is being charged with liquid refrigerant.
(a) Open the high pressure hand valve fully.
(b) Charge specified amount of refrigerant, then close the
high pressure hand valve.
HINT:
A fully charged system is indicated by the sight glass being free
of any bubbles.
4. REMOVE MANIFOLD GAUGE SET
(a) Close both hand valves of manifold gauge set.
(b) Disconnect the quick disconnect adapters from the ser-
vice valves.
5. INSTALL CAPS TO SERVICE VALVES ON REFRIGER-
ANT LINES
Page 117 of 1807
AC0Q2-01
Z18473
Pressure Switch
ReceiverRadiator
Fan Relay
No. 1
Compressor
Radiator
Fan Relay
No. 2Junction Block No. 2
Magnetic Clutch Relay
Reater Main Relay
Ambient Temperature
Sensor
Air Conditioning Amplifier
Solar Sensor
Room Temperature
SensorAir Conditioning
Control Assembly
Evaporator
Expansion Valve
Water Valve
Heater Radiaor
Air Outlet ServomotorAir Inlet
Servomotor
Blower Motor
Blower Motor
Control Relay
Evaporator Temperature Sensor
Air Mix Servomotor
Engine Coolant Temperature Sensor AC-14
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
2162 Author: Date:
1997 SUPRA (RM502U)
LOCATION
Page 118 of 1807
CH0086
CorrectWrong
AC0Q3-01
P10652
Type A
AB
Type B
- AIR CONDITIONINGDRIVE BELT
AC-15
2163 Author: Date:
1997 SUPRA (RM502U)
DRIVE BELT
ON-VEHICLE INSPECTION
1. INSPECT DRIVE BELT'S INSTALLATION CONDITION
Check that the drive belt fits properly in the ribbed grooves.
2. INSPECT DRIVE BELT TENTION
Check that the tension is within A range on the auto tensioner
scale.
If the tension is not within the A range on the scale, replace the
belt with a new one.
HINT:
When replacing the drive belt with a new one, the belt tension
should be within the B range on the belt tensioner scale.
Page 119 of 1807
AC0Q4-01
P14738
Turn AC-16
- AIR CONDITIONINGDRIVE BELT
2164 Author: Date:
1997 SUPRA (RM502U)
REMOVAL
REMOVE DRIVE BELT
Loosen the drive belt tension by turning the drive belt tensioner
clockwise, and remove the drive belt.
Page 120 of 1807
AC0Q9-01
N11373
Liquid Tube
Liquid TubeLiquid Tube
Liquid Tube Suction TubeEvaporator
Discharge Hose
Suction HoseExpansion Valve
Discharge
Tube
- AIR CONDITIONINGREFRIGERANT LINE
AC-21
2169 Author: Date:
1997 SUPRA (RM502U)
LOCATION