EMISSION CONTROL SYSTEMS (2JZ–GE)

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EG–163ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)EMISSION CONTROL SYSTEMS (2JZ–GE)SYSTEM PURPOSEThe emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from theengine ((3), (4) and (5)), to prevent the atmospheric release of blow–by gas–containing HC (1) and evaporated fuel containing HC being released from the fuel tank (2).The function of each system is shown in the following ÑÑÑÑÑÑÑSystemAbbreviationFunction(1) Positive Crankcase Ventilation(2) Evaporative Emission Control(3) Exhaust Gas Recirculation(4) Three–Way Catalytic Converter(5) Sequential Multiport Fuel Injection*PCVEVAPEGRTWCSFIReduces HCReduces evaporated HCReduces NOxReduces CO, HC and NOxInjects a precisely timed, optimum amount of fuel for reduced exhaust emissionsRemark: * For inspection and repair of the SFI system, refer to the SFI section this manual.PREPARATIONRECOMMENDED TOOLS09082–00050TOYOTA Electrical Tester Set ÑÑÑÑÑÑÑÑÑÑÑÑÑTachometerTorque wrenchVacuum gauge

EG–163ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)EMISSION CONTROL SYSTEMS (2JZ–GE)SYSTEM PURPOSEThe emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from theengine ((3), (4) and (5)), to prevent the atmospheric release of blow–by gas–containing HC (1) and evaporated fuel containing HC being released from the fuel tank (2).The function of each system is shown in the following ÑÑÑÑÑÑÑSystemAbbreviationFunction(1) Positive Crankcase Ventilation(2) Evaporative Emission Control(3) Exhaust Gas Recirculation(4) Three–Way Catalytic Converter(5) Sequential Multiport Fuel Injection*PCVEVAPEGRTWCSFIReduces HCReduces evaporated HCReduces NOxReduces CO, HC and NOxInjects a precisely timed, optimum amount of fuel for reduced exhaust emissionsRemark: * For inspection and repair of the SFI system, refer to the SFI section this manual.PREPARATIONRECOMMENDED ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑTachometerTorque wrenchVacuum gauge

EG–164ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)LAYOUT AND SCHEMATIC DRAWING

EG–165ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)POSITIVE CRANKCASE VENTILATION(PCV) SYSTEMPCV VALVE INSPECTION1. REMOVE PCV VALVE(a) Disconnect the PCV hose from the PCV valve.(b) Remove the PCV valve.2. INSTALL CLEAN HOSE TO PCV VALVE3. INSPECT PCV VALVE OPERATION(a) Blow air into the cylinder head side, and check that air passesthrough easily.CAUTION: Do not suck air through the valve. Petroleum substances inside the valve are harmful.(b) Blow air into the intake air connecter side, and check that airpasses through with difficulty.If operation is not as specified, replace the PCV valve.4. REMOVE CLEAN HOSE FROM PCV VALVE5. REINSTALL PCV VALVEPCV HOSES AND CONNECTORSINSPECTIONVISUALLY INSPECT HOSES, CONNECTIONS AND GASKETSCheck for cracks, leaks or damage.

EG–166ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)EVAPORATIVE EMISSION (EVAP)CONTROL SYSTEMFUEL VAPOR LINES, FUEL TANK ANDTANK CAP INSPECTION1.2.3.VISUALLY INSPECT LINES AND CONNECTIONSLook for loose connections, sharp bends or damage.VISUALLY INSPECT FUEL TANKLook for deformation, cracks or fuel leakage.VISUALLY INSPECT FUEL TANK CAPCheck if the cap and/or gasket are deformed or damaged.If necessary, repair or replace the cap.CHARCOAL CANISTER INSPECTION1.REMOVE CHARCOAL CANISTER2.VISUALLY INSPECT CHARCOAL CANISTERLook for cracks or damage.3.CHECK FOR CLOGGED FILTER AND STUCK CHECKVALVE(a) Using low pressure compressed air (4.71 kPa (0.048kgf/cm2, 0.68 psi)), blow into port B and check that air flowswithout resistance from the other ports.

EG–167ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)(b) Blow air (4.71 kPa (0.048 kgf/cm2, 0.68 psi)) into port A, andcheck that air does not flow from the other ports.If operation is not as specified, replace the charcoal canister.4.CLEAN FILTER IN CANISTERClean the filter by blowing 294 kPa (3 kgf/cm2, 43 psi) of compressed air into port B while holding port A closed.NOTICE: Do not attempt to wash the canister. No activated carbon should come out.5.REINSTALL CHARCOAL CANISTERVSV INSPECTION(See VSV for EVAP in SFI System)CHECK VALVE INSPECTION1.REMOVE CHECK VALVE2. INSPECT CHECK VALVE(a) Check that air flows from the blue port to the black port.(b) Check that air does not flow from the black port to the blueport.If operation is not as specified, replace the check valve.3. REINSTALL CHECK VALVEHINT: Install the check valve with the black port facing theport P side of the throttle body.

EG–168ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)EXHAUST GAS RECIRCULATION (EGR)SYSTEMEGR SYSTEM INSPECTION1.CHECK AND CLEAN FILTER IN EGR VACUUMMODULATOR(a) Remove the cap and filter.(b) Check the filter for contamination or damage.(c) Using compressed air, clean the filter.(d) Reinstall the filter and cap.HINT: Install the filter with the coarser surface facing the atmospheric side outward.2. INSTALL VACUUM GAUGEUsing a 3–way connector, connect a vacuum gauge to thehose between the EGR valve and EGR vacuum modulator.3. INSPECT SEATING OF EGR VALVECheck that the engine starts and runs at idle.4. INSPECT VSV OPERATION WITH COLD ENGINE(a) The engine coolant temperature should be below 45 C(113 F).(b) Check that the vacuum gauge indicates zero at 2,500 rpm.(c) Check that the EGR pipe is not hot.5.(a)(b)(c)(d)6.INSPECT OPERATION OF VSV AND EGR VACUUMMODULATOR WITH HOT ENGINEWarm up the engine to above 50 C (122 F).Check that the vacuum gauge indicates low vacuum at 3,500rpm.Disconnect the vacuum hose from port R of the EGR vacuummodulator and connect port R directly to the air intakechamber with another hose.Check that the vacuum gauge indicates high vacuum at3,500 rpm.HINT: As exhaust gas is increasingly recirculated, the enginewill start to misfire.REMOVE VACUUM GAUGERemove the vacuum gauge, and reconnect the vacuumhoses to their proper locations.

EG–169ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)7. INSPECT EGR VALVE(a) Apply vacuum directly to the EGR valve with the engineidling.(b) Check that the engine runs rough or dies.(c) Reconnect the vacuum hoses to their proper locations.IF NO PROBLEM IS FOUND DURING THIS INSPECTION,SYSTEM IS NORMAL; OTHERWISE INSPECT EACHPARTVSV INSPECTION(See VSV for EGR in SFI System)EGR VACUUM MODULATORINSPECTION1.2.(a)(b)(c)(d)3.DISCONNECT VACUUM HOSES FROM EGR VACUUMMODULATORDisconnect the 3 vacuum hoses from ports P, Q and R of theEGR vacuum modulator.INSPECT EGR VACUUM MODULATOR OPERATIONBlock ports P and R with your finger.Blow air into port Q, and check that air passes through to theair filter side freely.Start the engine, and maintain speed at 3,500 rpm.Repeat the above test. Check that there is a strongresistance to air flow.RECONNECT VACUUM HOSES TO EGR VACUUMMODULATORConnect the 3 vacuum hoses to the proper locations.EGR VALVE INSPECTION1.(a)(b)2.REMOVE EGR PIPELoosen the union nut of the EGR pipe.Remove the 2 bolts, EGR pipe and gasket.REMOVE EGR GAS TEMPERATURE SENSOR

EG–170ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)3. REMOVE EGR VALVE(a) Disconnect these hoses from the EGR valve:(1) Vacuum hose(2) Pressure hose(b) Remove the 2 nuts, EGR valve and gasket.4.INSPECT EGR VALVECheck for sticking and heavy carbon deposits.If a problem is found, replace the EGR valve.5. REINSTALL EGR VALVE(a) Place a new gasket on the intake air connector.(b) Install the EGR valve with the 2 nuts.Torque: 27 N m (280 kgf cm, 20 ft lbf)(c)6.Reconnect the following hoses to the EGR valve: Vacuum hose Pressure hoseREINSTALL EGR GAS TEMPERATURE SENSORTorque: 20 N m (200 kgf cm, 14 ft lbf)7. REINSTALL EGR PIPE(a) Temporarily install the union nut of the EGR pipe.(b) Install a new gasket and the EGR pipe with the 2 bolts.Torque: 21 N m (210 kgf cm, 15 ft lbf)(c)Tighten the union nut of the EGR pipe.Torque: 64 N m (650 kgf cm, 47 ft lbf)

EG–171ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)THREE–WAY CATALYTIC CONVERTER(TWC) SYSTEMEXHAUST PIPE ASSEMBLY INSPECTION1.2.CHECK CONNECTIONS FOR LOOSENSESS ORDAMAGECHECK CLAMPS FOR WEAKNESS, CRACKS ORDAMAGETWC INSPECTIONCHECK FOR DENTS OR DAMAGEIf any part of the protector is damaged or dented to the extentthat it contacts the TWC, repair or replace it.HEAT INSULATOR INSPECTION1.2.CHECK HEAT INSULATOR FOR DAMAGECHECK FOR ADEQUATE CLEARANCE BETWEENCATALYTIC CONVERTER AND HEAT INSULATOR

EG–172ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)COMPONENTS FOR FRONT TWCREMOVAL AND INSTALLATION

EG–173ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)COMPONENTS FOR REAR TWCREMOVAL AND INSTALLATION

EG–174ENGINE–EMISSION CONTROL SYSTEMS (2JZ–GE)SERVICE SPECIFICATIONSTORQUE ÑÑÑÑÑÑÑÑÑÑÑÑÑÑPart tightenedN mkgf cmft lbfEGR valve x Intake air connector2121015EGR gas temperature sensor x EGR valve2020014EGR pipe x Cylinder head2728020EGR valve x EGR pipe6465047No.2 front exhaust pipe (Front TWC) x Exhaust manifold6263046Pipe support bracket x Transmission4344032No.2 front exhaust pipe (Front TWC) x Front exhaust pipe (Rear TWC)4344032Front exhaust pipe (Rear TWC) x Center exhaust pipe4344032Sub heated oxygen sensor (California only) x Front exhaust pipe2020014

650 47 No.2 front exhaust pipe (Front TWC) x Exhaust manifold 62 630 46 Pipe support bracket x Transmission 43 440 32 No.2 front exhaust pipe (Front TWC) x Front exhaust pipe (Rear TWC) 43 440 32 Front exhaust pipe (Rear TWC) x Center exhaust pipe 43 440 32 Sub heated oxygen sensor (California only) x Front exhaust pipe 20 200 14 EG–174

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