heater TOYOTA SUPRA 1997 Service Repair Manual

V07469
HEAT METHOD: When the problem seems to occur when the suspect area is heated. 2
NOTICE:
(1) Do not heat to more than 60 °C (140 °F). (Temperature
is limited not to damage the components.)
(2) Do not apply heat directly to parts in the ECU.
3 WATER SPRINKLING METHOD:
NOTICE:
(1) Never sprinkle water directly into the engine
compartment, but indirectly change the temperature and
humidity by applying water spray onto the radiator front
surface.
(2) Never apply water directly onto the electronic
components.
4 OTHER: When a malfunction seems to occur when electrical load is excessive.When the malfunction seems to occur on a rainy day or in a
high-humidity condition. Heat the component that is the likely cause of the malfunction
with a hair dryer or similar object. Check to see if the malfunction
occurs.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
Turn on all electrical loads including the heater blower, head
lights, rear window defogger, etc. and check to see if the mal-
function occurs.ON (Service hint)
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be taken.
Malfunc-
tion
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN-23
23 Author
: Date
:
1997 SUPRA (RM502U)

IN04J-01
- INTRODUCTIONTERMS
IN-35
35 Author
: Date
:
1997 SUPRA (RM502U)
GLOSSARY OF SAE AND TOYOTA TERMS
This glossary lists all SAE-J1930 terms and abbreviations used in this manual in compliance with SAE rec-
ommendations, as well as their Toyota equivalents.
SAE
ABBREVIATIONSSAE TERMSTOYOTA TERMS
( )--ABBREVIATIONS
A/CAir ConditioningAir Conditioner
ACLAir CleanerAir Cleaner
AIRSecondary Air InjectionAir Injection (AI)
APAccelerator Pedal-
B+Battery Positive Voltage+B, Battery Voltage
BAROBarometric Pressure-
CACCharge Air CoolerIntercooler
CARBCarburetorCarburetor
CFIContinuous Fuel Injection-
CKPCrankshaft PositionCrank Angle
CLClosed LoopClosed Loop
CMPCamshaft PositionCam Angle
CPPClutch Pedal Position-
CTOXContinuous Trap Oxidizer-
CTPClosed Throttle Position-
DFIDirect Fuel Injection (Diesel)Direct Injection (DI)
DIDistributor Ignition-
DLC1
DLC2
DLC3Data Link Connector 1
Data Link Connector 2
Data Link Connector 31: Check Connector
2: Total Diagnosis Comunication Link (TDCL)
3: OBD II Diagnostic Connector
DTCDiagnostic Trouble CodeDiagnostic Code
DTMDiagnostic Test Mode-
ECLEngine Control Level-
ECMEngine Control ModuleEngine ECU (Electronic Control Unit)
ECTEngine Coolant TemperatureCoolant Temperature, Water Temperature (THW)
EEPROMElectrically Erasable Programmable Read Only Memory
Electrically Erasable Programmable Read Only Memory
(EEPROM),
Erasable Programmable Read Only Memory (EPROM)
EFEEarly Fuel EvaporationCold Mixture Heater (CMH), Heat Control Valve (HCV)
EGRExhaust Gas RecirculationExhaust Gas Recirculation (EGR)
EIElectronic IgnitionDistributorless Ignition (DI)
EMEngine ModificationEngine Modification (EM)
EPROMErasable Programmable Read Only MemoryProgrammable Read Only Memory (PROM)
EVAPEvaporative EmissionEvaporative Emission Control (EVAP)
FCFan Control-
FEEPROMFlash Electrically Erasable Programmable
Read Only Memory-
FEPROMFlash Erasable Programmable Read Only Memory-
FFFlexible Fuel-
FPFuel PumpFuel Pump
GENGeneratorAlternator
GNDGroundGround (GND)

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

AC0QB-02
I00911
Instrument Panel
Reinforcement
No. 1 Brace
Water Hose
Insulator Retainer
Heater to Register No. 3 Duct
Suction Tube
Liquid Tube
A/C Unit
O-ring

Non-reusable part
- AIR CONDITIONINGAIR CONDITIONING UNIT
AC-23
2171 Author
: Date
:
1997 SUPRA (RM502U)
AIR CONDITIONING UNIT
COMPONENTS

N11671
Defroster Nozzle
Water Valve CoverPlate
Water Valve
Heater Radiator
A/C Unit
Block Joint
Blower Motor
Control Relay
Blower Motor
Lower CaseEvaporator
Expansion
Valve Air Inlet
Servomotor
Evaporator Temperature
Sensor Heater Air Duct
Evaporator CoverVent Air DuctEngine Coolant
Temperature
SensorAir Outlet
ServomotorAir Mix
Servomotor AC-24
- AIR CONDITIONINGAIR CONDITIONING UNIT
2172 Author
: Date
:
1997 SUPRA (RM502U)

AC0QC-01
N08378
I03519
- AIR CONDITIONINGAIR CONDITIONING UNIT
AC-25
2173 Author
: Date
:
1997 SUPRA (RM502U)
REMOVAL
1. DISCHARGE REFRIGERANT FROM REFRIGERANT
SYSTEM
HINT:
At the time of installation, please refer to the following item.
Evacuate air from refrigeration system.
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
HINT:
It is not necessary to drain out all coolant.
3. REMOVE THESE PARTS:
(a) Engine wire harness bracket mounting bolt
(b) Brake tube bracket mounting bolts
4. DISCONNECT WATER HOSE FROM HEATER RADIA-
TOR PIPES
(a) Using priers, grip the claw of the hose clip and slide the
clip along the hose.
(b) Disconnect the water hoses from heater radiator pipes.
5. REMOVE INSULATOR RETAINER
Remove the 2 bolts and the insulator retainer.

N08379
N08536
N09037
I03520
AC-26
- AIR CONDITIONINGAIR CONDITIONING UNIT
2174 Author
: Date
:
1997 SUPRA (RM502U)
6. REMOVE LIQUID TUBE AND SUCTION TUBE
(a) Remove the ABS actuator.
(See page BR-70)
(b) Remove the bolt and slide the plate, then disconnect the
both tubes.
Torque: 10 N´m (100 kgf´cm, 7 ft´lbf)
NOTICE:
Cap the open fittings immediately to keep moisture or dirt
out of the system.
HINT:
At the time of installation, please refer to the following item.
Lubricante 2 new O-rings with compressor oil and install tubes.
7. REMOVE PLATE COVER
Remove the 2 bolts and the plate cover.
8. REMOVE INSTRUMENT PANEL AND REINFORCE-
MEN
(See page BO-50)
9. REMOVE HEATER TO REGISTER NO.3 DUCT
Remove the 3 screws and the heater to radister No.3 duct.
10. REMOVE A/C UNIT
(a) Disconnect connecters from the A/C unit.
(b) Remove the 6 bolts and the A/C unit.
HINT:
At the time of installation, please refer to the following item.
Pull the drain hose of the A/C unit forward until the yellow paint
on the hose is visible in the engine compartment.
Insert the drain hose into the engine compartment hose until the
matchmarks are aligned.

N08403
AC-28
- AIR CONDITIONINGAIR CONDITIONING UNIT
2176 Author
: Date
:
1997 SUPRA (RM502U)
6. REMOVE HEATER RADIATOR AND WATER VALVE
(a) Remove the 2 screws and the plate.
(b) Remove the 2 screws and the clamp.
(c) Remove the 3 screws.
(d) Pull out the heater radiator with the water valve.
(e) Remove the 2 screws and water valve from the heater ra-
diator.
7. REMOVE HEATER AIR DUCT
Remove the 2 screws and the defroster air duct.
8. REMOVE AIR VENT DUCT
(a) Disconnect the control link.
(b) Remove the 2 screws and the vent air duct.
9. REMOVE ENGINE COOLANT TEMPERATURE SEN-
SOR
(a) Disconnect the connector.
(b) After pulling off the clamp, pull out the sensor.
10. REMOVE AIR OUTLET SERVOMOTOR
(a) Disconnect the connector.
(b) Remove the 3 screws and the air outlet servomotor.

AC0QS-02
N08379
N08737
- AIR CONDITIONINGEVAPORATOR
AC-47
2195 Author
: Date
:
1997 SUPRA (RM502U)
EVAPORATOR
REMOVAL
1. DISCHARGE REFRIGERANT IN REFRIGERATION
SYSTEM
HINT:
At the time of installation, please refer to the following item.
Evacuate air from refrigeration system.
Charge system with refrigerant and inspect for leakage of refrig-
erant.
Specifieed amount: 700 ± 50 g (24.96 ± 1.76 oz.)
2. REMOVE ABS ACTUATOR (See page BR-70)
3. DISCONNECT LIQUID TUBE AND SUCTION TUBE
FROM A/C UNIT
Torque: 10 N´m (100 kgf´cm, 7 ft´lbf)
NOTICE:
Cap the open fittings immediately to keep moisture or dirt
out of the system.
HINT:
At the time of installation, please refer to the following item.
Lubricate 2 new O-rings with compressor oil and install the
tubes.
4. REMOVE THESE PARTS:
(a) Glove compartment parts
(b) Heater to register No.4 duct
(c) Front door scuff plate RH
(d) Floor carpet
5. REMOVE ECM
(a) Slide the floor carpet backward.
(b) Remove the 2 nuts and the ECM cover.
(c) Disconnect the connector.
(d) Remove the 2 nuts and the ECM.

AC0QV-01
N08400
N08401
N08402
I03526
- AIR CONDITIONINGHEATER RADIATOR
AC-51
2199 Author
: Date
:
1997 SUPRA (RM502U)
HEATER RADIATOR
REMOVAL
1. REMOVE AIR CONDITIONING UNIT
(See page AC-25)
2. REMOVE HEATER RADIATOR AND WATER VALVE
(a) Remove the 2 screws and the plate.
(b) Remove the 2 screws and the clamp.
(c) Remove the 3 screws.
(d) Pull out the heator with the water valve.
(e) Remove the 2 screws and water valve from the heater ra-
diator.