TOYOTA SUPRA 1995 Service Manual PDF

REFRIGERANT SYSTEM INSPECTION WITH MANIFOLD GAUGE SET
This is a method in which the trouble is located by using a manifold gauge set.
(See ªUSE OF MANIFOLD GAUGE SETº on page AC±11)
Read the manifold gauge pressure when the following conditions are established:
(a) Temperature at the air inlet with the switch set at RECIRC is 30±35 °C (86±95 °F)
(b) Engine running at 1,500 rpm
(c) Blower speed control switch set at high
(d) Temperature control set at max. cool
HINT: It should be noted that the gauge indications may vary slightly due to ambient temperature condi-
tions.
1. NORMALLY FUNCTIONING REFRIGERATION SYSTEM
Gauge reading:
Low pressure side:
0.15±0.25 MPa (1.5±2.5 kgf/cm
2)
High pressure side:
1.37±1.57 MPa (14±16 kgf/cm
2)
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±71

2. MOISTURE PRESENT IN REFRIGERATION SYSTEM
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

During operation, pres±
sure on low pressure
side sometimes
becomes a vacuum and
sometimes normal
Moisture entered in re±
frigeration system
freezes at expansion
valve orifice and tem±
porarily stops cycle, but
normal state is restored
after a time when the ice
melts(1) Replace receiver/drier
(2) Remove moisture in
cycle through repeat±
edly evacuating air
(3) Charge new refriger±
ant to proper amount
Drier in oversaturated
state

Moisture in refrigeration
system freezes at ex±
pansion valve orifice
and blocks circulation of
refrigerant
Condition: Periodically cools and then fails to cool
3. INSUFFICIENT REFRIGERANT
Symptom seen in
refrigeration system
Condition: insufficient cooling
Probable causeDiagnosisRemedy

Pressure low on both
low and high pressure
sides

Bubbles seen in sight
glass continuously

insufficient cooling
performance
Gas leakage at some
place in refrigeration
system
Insufficient refrigerant
in system

Refrigerant leaking(1) Check for gas leak
age with leak detec±
tor and repair if nec±
essary
(2) Charge refrigerant to
proper amount
(3) If pressure indicated
value is near 0 when
connected to gauge,
create the vacuum
after inspecting and
repairing the location
of the leak
AC±72± AIR CONDITIONING SYSTEMTROUBLESHOOTING

4. POOR CIRCULATION OF REFRIGERANT
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure low on both
low and high pressure
sides

Frost on tubes from
receiver to unit
Refrigerant flow
obstructed by dirt in
receiver
Receiver clogged
Replace receiver
Condition: insufficient cooling
5. REFRIGERANT DOES NOT CIRCULATE
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Vacuum indicated on
low pressure side, very
low pressure indicted
on high pressure side

Frost or dew seen on
piping before and after
receiver/drier or expan±
sion valve
Refrigerant flow
obstructed by moisture
or dirt in refrigeration
system

Refrigerant flow ob±
structed by gas leakage
from expansion valve
heat sensing tube
Refrigerant does not
circulate(1) Check heat sensing
tube, expansion valve
and ERP
(2) Clean out dirt inexpan±
sion valve by blowing
with air
If not able to remove
dirt, replace expansion
valve
(3) Replace receiver
(4) Evacuate air and
charge new refrigerant
to proper amount.
for gas leakage from
heat sensing tube, re
place expansion valve.
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±73

6. REFRIGERANT OVERCHARGE OR INSUFFICIENT COOLING OF CONDENSER
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
(1) Clean condenser
(2) Check fan motor
operation
(3) If (1) and (2) are in
normal state, check
amount of refrigerant
Charge proper amount
of refrigerant
Pressure too high on both
low and high pressure
sides

No air bubbles seen
through the sight of glass
even when the engine
rpm is lowered.
Unable to develop
sufficient performance
due to excessive
refrigerant in system

Insufficient cooling of
condenser
Excessive refrigerant in
in cycle " refrigerant
overcharged

Condenser cooling
insufficient " condenser
fins clogged or fan motor
faulty
Condition: Insufficient Cooling
7. AIR PRESENT IN REFRIGERATION SYSTEM
Condition: insufficient cooling
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
(1) Check compressor oil to
see if dirty or insufficient
(2) Evacuate air and charge
new refrigerant
Pressure too high on both
low and high pressure
sides

The low pressure piping is
hot to the touch

Bubbles seen in sight
glass
Air entered in
refrigeration system
Air present in
refrigeration system
NOTE: These gauge indications are shown when the refrigeration
system has been opened and the refrigerant charged without
vacuum purging.

Insufficient vacuum
purging
AC±74± AIR CONDITIONING SYSTEMTROUBLESHOOTING

8. EXPANSION VALVE IMPROPERLY
MOUNTED/HEAT SENSING TUBE DEFECTIVE
(OPENS TOO WIDE)
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
(1) Check heat sensing tube
installed condition
(2) if (1) is normal, check
expansion valve
Replace if defective
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 or heat sensing tube
not installed correctly
Excessive refrigerant in
low pressure piping
Condition: Insufficient cooling

Expansion valve opened
too wide
9. DEFECTIVE COMPRESSION COMPRESSOR
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
Condition: Does not cool

Repair or replace
compressor
Pressure too high on
low pressure sides

Pressure too low on
high pressure side
Internal leak in
compressor
Compression defective

Valve leaking or broken,
sliding parts
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±75

REFRIGERANT VOLUME
REFRIGERANT VOLUME INSPECTION
1. RUN ENGINE AT APPROX. 1,500 RPM
2. SET TEMPERATURE CONTROL AT MAX. COOL
3. SET BLOWER SWITCH AT ºHIº
4. SET AIR INLET CONTROL AT ºRECIRCº
5. TURN A/C SWITCH ON
6. FULLY OPEN DOORS
7. INSPECT AMOUNT OF REFRIGERANT
Observe the sight glass on the liquid tube.
 Item Symptom Amount of refrigerant Remedy
 
 
 
 
1
 
 
 
 
Bubbles present in sight glass
 
 
 
 
Insufficient*
 
 
 
 
(1) Check for gas leakage with gas leak
tester and repair if necessary
(2) Add refrigerant until bubbles dis±
appear
 
 2
 
 No bubbles present in sight glass
 
 
None, sufficient or too
much 
 Refer to items 3 and 4
 
 
 
 
3
 
 
 
 
No temperature difference between
compressor inlet and outlet
 
 
 
 
Empty or nearly empty
 
 
 
 
(1) Check for gas leakage with gas leak
tester and repair if necessary
(2) Add refrigerant until bubbles disap-
pear
 
 4 
 
Temperature between compressor
inlet and outlet is noticeably different 
 Correct or too much 
 Refer to items 5 and 6
 
 
 
5
 
 
 
Immediately after air conditioning is
turned off, refrigerant in sight glass
stays clear 
 
 
Too much
 
 
 
(1) Discharge refrigerant
(2) Evacuate air and charge proper
amount of purified refrigerant
 
 
 
6
 
 
 
When air conditioning is turned off,
refrigerant foams and then stays
clear 
 
 
Correct
 
 
 
±±
* Bubbles in the sight glass with ambient temperatures higher
than usual can be considered normal if cooling is sufficient.
REFRIGERANT CHARGE VOLUME
Specified amount:
700 + 50 g (24.96 + 1.76 oz.)
AC±76± AIR CONDITIONING SYSTEMREFRIGERANT VOLUME

DRIVE BELT TENSION
DRIVE BELT TENSION INSPECTION
1. INSPECT DRIVE BELT'S INSTALLATION CONDITION
Check that drive belt fits properly in the ribbed grooves.
2. INSPECT DRIVE BELT TENSION
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's
tension should be within the B range on the belt tensioner
scale.
IDLE±UP SPEED
IDLE UP SPEED INSPECTION
1. WARM UP ENGINE
2. INSPECT IDLE SPEED
Put gear shift in neutral.
2JZ±GE (M/T)
 
Magnetic clutch condition 
Standard idle speed (RPM)
 Not engaged Approx. 700
 Engaged Approx. 900
2JZ±GE (A/T)
 Magnetic clutch condition Standard idle speed (RPM) Not engaged Approx. 700 
 Engaged
 
 Approx. 800
2JZ±GTE
 Magnetic clutch condition Standard idle speed (RPM)
 Not engaged Approx. 650 Engaged Approx. 800
± AIR CONDITIONING SYSTEMDRIVE BELT TENSIONAC±77

REFRIGERANT LINES
TIGHTENING TORQUE OF REFRIGERATION LINES
ON±VEHICLE INSPECTION
1. INSPECT HOSES AND TUBES FOR LEAKAGE
Using a gas leak tester, check for leakage of refrigerant.
2. INSPECT HOSE AND TUBE CONNECTIONS FOR
LOOSENESS AC±78
± AIR CONDITIONING SYSTEMREFRIGERANT LINES

REFRIGERANT LINES REPLACEMENT
1. DISCHARGE REFRIGERANT IN REFRIGERATION
SYSTEM
2. REPLACE FAULTY TUBE OR HOSE
NOTICE: To prevent the intrusion of moisture or dirt,
caps should be placed on hose or tube ends immediate-
ly.
3. TORQUE CONNECTIONS TO SPECIFIED TORQUE
NOTICE: Connections should not be torqued tighter than
the specified torque.
Compressor X Suction tube
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Compressor X Discharge tube
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Condenser X Discharge tube
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Condenser X Liquid tube
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Receiver X Liquid tube
Torque: 5.4 NVm (55 kgfVcm, 48 in.Vlbf)
A/C unit X Liquid tube
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
A/C unit X Suction tube
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Evaporator X Expansion valve
Torque: 5.4 NVm (55 kgfVcm, 48 in.Vlbf)
Discharge lines
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Liquid lines
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
Suction lines
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
4. EVACUATE AIR IN REFRIGERATION SYSTEM AND
CHARGE WITH REFRIGERANT
Specified amount:
700 + 50 g (24.96 + 1.76 oz.)
5. INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak tester, check for leakage of refrigerant.
6. INSPECT AIR CONDITIONING OPERATION
± AIR CONDITIONING SYSTEMREFRIGERANT LINESAC±79

AIR CONDITIONING UNIT
AIR CONDITIONING UNIT REMOVAL
1. DISCHARGE REFRIGERANT IN REFRIGERATION
SYSTEM
INSTALLATION HINT: Evacuate air from refrigeration sys-
tem.
Charge system with the refrigerant and inspect for leakage
of refrigerant.
Specified amount:
700 + 50 g (24.96 + 1.76 oz.)
2. DRAIN ENGINE COOLANT FROM RADIATOR AND
ENGINE COOLANT DRAIN COCK
3. REMOVE ENGINE WIRE HARNESS BRACKET
MOUNTING BOLT
4. REMOVE BRAKE TUBE BRACKET MOUNTING BOLTS
FROM DASH PANEL
5. REMOVE WATER HOSE FROM HEATER RADIATOR
6. REMOVE INSULATOR RETAINER
Remove the 2 bolts and the insulator retainer.
7. REMOVE LIQUID TUBE AND SUCTION TUBE
(a) w/ ABS:
Remove the ABS actuator.
(See page BR±44)
(b) Remove the liquid tube and suction tube.
Torque: 10 NVm (100 kgfVcm, 7 ftVlbf)
INSTALLATION HINT: Lubricate the new O±rings with com-
pressor oil and install tubes.
8. REMOVE PLATE COVER
Remove the 2 bolts and the plate cover.
9. REMOVE INSTRUMENT PANEL AND REINFORCEMENT
(See page BO±45) AC±80
± AIR CONDITIONING SYSTEMAIR CONDITIONING UNIT