catalytic converter TOYOTA SUPRA 1995 Service Repair Manual

INTRODUCTIONGLOSSARY OF SAE AND TOYOTA TERMS -
IN-8
IACIdle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature
ICMIgnition Control Module-
IFIIndirect Fuel InjectionIndirect Injection
IFSInertia Fuel-Shutoff-
ISCIdle Speed Control-
KSKnock SensorKnock Sensor
MAFMass Air FlowAir Flow Meter
MAPManifold Absolute PressureManifold Pressure
Intake Vacuum
MCMixture Control
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
MDPManifold Differential Pressure-
MFIMultiport Fuel InjectionElectronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Light
MSTManifold Surface Temperature-
MVZManifold Vacuum Zone-
NVRAMNon-V olatile Random Access Memory-
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn-Board DiagnosticOn-Board Diagnostic (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Converter (OC), CCo
OPOpen LoopOpen Loop
PAIRPulsed Secondary Air InjectionAir Suction (AS)
PCMPowertrain Control Module-
PNPPark/Neutral Position-
PROMProgrammable Read Only Memory-
PSPPower Steering Pressure-
PTOXPeriodic Trap OxidizerDiesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM)
RMRelay Module-
ROMRead Only MemoryRead Only Memory (ROM)
RPMEngine SpeedEngine Speed
SCSuperchargerSupercharger
SCBSupercharger Bypass-
SFISequential Multiport Fuel InjectionElectronic Fuel Injection (EFI), Sequential Injection
SPLSmoke Puff Limiter-
SRIService Reminder Indicator-
SRTSystem Readiness Test-
STScan Tool-
TBThrottle BodyThrottle Body
TBIThrottle Body Fuel InjectionSingle Point Injection
Central Fuel Injection (Ci)
TCTurbochargerTurbocharger
TCCTorque Converter ClutchTorque Converter
TCMTransmission Control ModuleTransmission ECU (Electronic Control Unit)
TPThrottle PositionThrottle Position
TRTransmission Range-

INTRODUCTIONGLOSSARY OF SAE AND TOYOTA TERMS -
IN-9
TVVThermal Vacuum ValveBimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
TWCThree-W ay Catalytic ConverterThree-W ay Catalyst (TWC)
CC
RO
TWC+OCThree-W ay + Oxidation Catalytic ConverterCCR + CCo
VA FVolume Air FlowAir Flow Meter
VRVoltage RegulatorVoltage Regulator
VSSVehicle Speed SensorVehicle Speed Sensor (Read Switch Type)
WOTWide Open ThrottleFull Throttle
WU-OCWarm Up Oxidation Catalytic Converter-
WU-TWCWarm Up Three-Way Catalytic ConverterManifold Converter
3GRThird Gear-
4GRFourth Gear-

EMISSION CONTROL SYSTEMS (2JZ±GE)
SYSTEM PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine ((3), (4) and (5)), to prevent the atmospheric release of blow±by gas±containing HC (1) and evapo-
rated fuel containing HC being released from the fuel tank (2).
The function of each system is shown in the following table.
 System Abbreviation Function
 
 
 
 
 
 
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Exhaust Gas Recirculation
(4) Three±Way Catalytic Converter
(5) Sequential Multiport Fuel Injection* 
 
 
 
 
 
PCV
EVAP
EGR
TWC
SFI 
 
 
 
 
 
Reduces HC
Reduces evaporated HC
Reduces NOx
Reduces CO, HC and NOx
Injects a precisely timed, optimum amount of fuel for re-
duced exhaust emissions
Remark: * For inspection and repair of the SFI system, refer to the SFI section this manual.
PREPARATION
RECOMMENDED TOOLS
09082±00050 TOYOTA Electrical Tester Set


EQUIPMENT
 
 Tachometer 
 
 
 Torque wrench 
 
 
 Vacuum gauge 
 
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GE)EG±163

EMISSION CONTROL SYSTEMS (2JZ±GE)
SYSTEM PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine ((3), (4) and (5)), to prevent the atmospheric release of blow±by gas±containing HC (1) and evapo-
rated fuel containing HC being released from the fuel tank (2).
The function of each system is shown in the following table.
 System Abbreviation Function
 
 
 
 
 
 
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Exhaust Gas Recirculation
(4) Three±Way Catalytic Converter
(5) Sequential Multiport Fuel Injection* 
 
 
 
 
 
PCV
EVAP
EGR
TWC
SFI 
 
 
 
 
 
Reduces HC
Reduces evaporated HC
Reduces NOx
Reduces CO, HC and NOx
Injects a precisely timed, optimum amount of fuel for re-
duced exhaust emissions
Remark: * For inspection and repair of the SFI system, refer to the SFI section this manual.
PREPARATION
RECOMMENDED TOOLS
EQUIPMENT
 
 Tachometer 
 
 
 Torque wrench 
 
 
 Vacuum gauge 
 
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GE)EG±163

THREE±WAY CATALYTIC CONVERTER
(TWC) SYSTEM
EXHAUST PIPE ASSEMBLY INSPECTION
1. CHECK CONNECTIONS FOR LOOSENSESS OR
DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR
DAMAGE
TWC INSPECTION
CHECK FOR DENTS OR DAMAGE
If any part of the protector is damaged or dented to the extent
that it contacts the TWC, repair or replace it.
HEAT INSULATOR INSPECTION
1. CHECK HEAT INSULATOR FOR DAMAGE
2. CHECK FOR ADEQUATE CLEARANCE BETWEEN
CATALYTIC CONVERTER AND HEAT INSULATOR
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GE)EG±171

EMISSION CONTROL SYSTEMS (2JZ±GTE)
SYSTEM PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine ((3), (4) and (5)), to prevent the atmospheric release of blow±by gas±containing HC (1) and evapo-
rated fuel containing HC being released from the fuel tank (2).
The function of each system is shown in the following table.
 System Abbreviation Function 
 
 
 
 
 
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Exhaust Gas Recirculation
(4) Three±way Catalytic Converter
(5) Sequential Multiport Fuel Injection*
 
 
 
 
 
 
PCV
EVAP
EGR
TWC
SFI
 
 
 
 
 
 
Reduces HC
Reduces evaporated HC
Reduces NOx
Reduces CO, HC and NOx
Injects a precisely timed, optimum amount of fuel for reduced
exhaust emissions
Remark: * For inspection and repair of the SFI system, refer to the SFI section this manual.
PREPARATION
RECOMMENDED TOOLS
09082±00050 TOYOTA Electrical Tester Set


EQUIPMENT
 
 Tachometer 
 
 
 
Torque wrench 
 
 
 
Vacuum gauge 
 
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±175

EMISSION CONTROL SYSTEMS (2JZ±GTE)
SYSTEM PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine ((3), (4) and (5)), to prevent the atmospheric release of blow±by gas±containing HC (1) and evapo-
rated fuel containing HC being released from the fuel tank (2).
The function of each system is shown in the following table.
 System Abbreviation Function 
 
 
 
 
 
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Exhaust Gas Recirculation
(4) Three±way Catalytic Converter
(5) Sequential Multiport Fuel Injection*
 
 
 
 
 
 
PCV
EVAP
EGR
TWC
SFI
 
 
 
 
 
 
Reduces HC
Reduces evaporated HC
Reduces NOx
Reduces CO, HC and NOx
Injects a precisely timed, optimum amount of fuel for reduced
exhaust emissions
Remark: * For inspection and repair of the SFI system, refer to the SFI section this manual.
PREPARATION
RECOMMENDED TOOLS
09082±00050 TOYOTA Electrical Tester Set
EQUIPMENT
 
 Tachometer 
 
 
 
Torque wrench 
 
 
 
Vacuum gauge 
 
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±175

THREE±WAY CATALYTIC CONVERTER
(TWC) SYSTEM
EXHAUST PIPE ASSEMBLY INSPECTION
1. CHECK CONNECTIONS FOR LOOSENSESS OR
DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR
DAMAGE
TWC INSPECTION
CHECK FOR DENTS OR DAMAGE
If any part of the protector is damaged or dented to the extent
that it contacts the TWC, repair or replace it.
HEAT INSULATOR INSPECTION
1. CHECK HEAT INSULATOR FOR DAMAGE
2. CHECK FOR ADEQUATE CLEARANCE BETWEEN
CATALYTIC CONVERTER AND HEAT INSULATOR
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±183

Wire Harness and Connector
The SRS wire harness is integrated with the cowl wire har-
ness assembly and floor wire harness assembly. The wires
for the SRS wire harness are encased in a yellow corrugated
tube. All the connectors for the system are also a standard
yellow color. If the SRS wire harness becomes disconnected
or the connector becomes broken due to an accident, etc.,
repair or replace it as shown on page RS±36.
FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION: If large amounts of unburned gasoline flow into the converter, it may overheat and create a fire
hazard. To prevent this, observe the following precautions and explain them to your customer.
1. Use only unleaded gasoline.
2. Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
3. Avoid spark jump test.
(a) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(b) While testing, never race the engine.
4. Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
5. Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
6. Avoid coasting with ignition turned off and prolonged braking.
7. Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
± INTRODUCTIONPRECAUTIONIN±15

 IAC Idle Air Control Idle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature ICM Ignition Control Module ± IFI Indirect Fuel Injection Indirect Injection IFS Inertia Fuel±Shutoff ±
 ISC Idle Speed Control ±
 KS Knock Sensor Knock Sensor
 MAF Mass Air Flow Air Flow Meter
 MAP Manifold Absolute Pressure Manifold Pressure
Intake Vacuum
 
 
 
MC
 
 
 
Mixture Control
 
 
 
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
 MDP Manifold Differential Pressure ±
 MFI Multiport Fuel Injection Electronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Light MST Manifold Surface Temperature ± MVZ Manifold Vacuum Zone ± NVRAM Non±Volatile Random Access Memory ±
 O2S Oxygen Sensor Oxygen Sensor, O2 Sensor (O2S)
 OBD On±Board Diagnostic On±Board Diagnostic (OBD)
 OC Oxidation Catalytic Converter Oxidation Catalyst Converter (OC), CCo
OPOpen LoopOpen Loop PAIR Pulsed Secondary Air Injection Air Suction (AS) PCM Powertrain Control Module ± PNP Park/Neutral Position ±
 PROM Programmable Read Only Memory ±
 PSP Power Steering Pressure ±
 
 
PTOX 
 
Periodic Trap Oxidizer 
 
Diesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM) RM Relay Module ± ROM Read Only Memory Read Only Memory (ROM) RPM Engine Speed Engine Speed
 SC Supercharger Supercharger
 SCB Supercharger Bypass ±
 SFI Sequential Multiport Fuel Injection Electronic Fuel Injection (EFI), Sequential Injec-
tion
 SPL Smoke Puff Limiter ± SRI Service Reminder Indicator ± SRT System Readiness Test ±
 ST Scan Tool ±
 TB Throttle Body Throttle Body
 TBI Throttle Body Fuel Injection Single Point Injection
Central Fuel Injection (Ci)
 TC Turbocharger Turbocharger TCC Torque Converter Clutch Torque Converter TCM Transmission Control Module Transmission ECU (Electronic Control Unit)
 TP Throttle Position Throttle Position
 TR Transmission Range ±
IN±40± INTRODUCTIONGLOSSARY OF SAE AND TOYOTA TERMS