emissions control system

8/2/2019 Emissions Control System

1/23

Emissions ControlSystemGENERAL

SPECIFICATIONS EC-2TIGHTENING TORQUES EC-2TROUBLESHOOTING EC-2COMPONENTS EC-2COMPONENTS LOCATION EC-3SCHEMATIC DIAGRAM EC-6

EXHAUST EMISSION CONTROL SYSTEMDESCRIPTION EC-20CONTINUOUSLY VARIABLE VALVE TIMING(CVVT) SYSTEM

COMPONENTS LOCATION EC-21DESCRIPTION EC-21OPERATION EC-22CRANKCASE EMISSION CONTROL SYSTEM

COMPONENTS LOCATION EC-8POSITIVE CRANKCASE VENTILATION (PCV)VALVE

OPERATION EC-10REMOVAL EC-11INSPECTION EC-11INSTALLATION EC-11

EVAPORATIVE AND ORVR EMISSIONCONTROL SYSTEM

DESCRIPTION EC -12EVAPORATIVE EMISSION CONTROLSYSTEM

DESCRIPTION EC-13SCHEMATIC DIAGRAM EC-16INSPECTION EC-17EVAPORATIVE (EVAP) CANISTER

INSPECTION EC-17EVAPORATIVE (EVAP) CANISTER PURGESOLENOID VALVEINSPECTION EC-18FUEL FILLER CAP

DESCRIPTION EC-19


2/23

EC -2 EMISSIONS CONTROL SYSTEMGENERALSPECIFICATIONS EB7129BC

Item SpecificationType Duty Control typePurge Control Solenoid Valve (PCSV) 24.5 - 27.5 at 20C (68 OF)esistance (IJ)

Fuel Tank Pressure Sensor (FTPS) Type Piezo-Resistivity typeOutput Voltage Approx. 2.5V at idleType ON/OFF Control typeCanister Close Valve (CCV) Resistance 23.0 - 26.0 B tl at 2001 (68111)

TIGHTENING TORQUES E9CEAC3FItem Nm kgfcm IbHt

Posit ive Crankcase Ventilation Valve 7.8 - 11.8 0.8 - 1.2 5.8 - 8.7

TROUBLESHOOTING E4009097Symptom Suspect area Remedy

Engine will not start or hard Vacuum hose disconnected or damaged Repair or replaceto start Malfunction of the EVAP. Canister Repair or replacePurge Solenoid Valve

Vacuum hose disconnected or damaged Repair or replaceMalfunction of the PCV valve ReplaceRough idle or engine stalls Check the system; if thereMalfunction of the evaporative emissioncanister purge system is a problem, check relatedcomponents parts

Excessive oil consumption Positive crankcase ventilation line clogged Check posit ive crankcaseventilation system

COMPONENTS EFAFA1BOComponents Function Remarks

Crankcase Emission System- Positive Crankcase Ventilation HC reduction Variable flow rate type(PCV) valveEvaporative Emission System- Evaporative emission canister HC reduction- Purge Control Solenoid Valve (PCSV) HC reduction Duty control solenoid valveExhaust Emission System- MFI system (air-fuel mixtrue CO, HC, NOx reduction Heated oxygen sensor feedback typecontrol device) CO, HC, NOx reduction Monolithic type- Three-way catalytic converter


3/23

GENERAL EC-3COMPONENTS LOCATION EBAF6A5A

[2.0 DOHC]

4

[2.7 DOHC] 2

4

1. Purge Control Solenoid Valve (PCSV)2. PCVValve 5. uel Tank Pressure Sensor (FTPS)

6. Canister Close Valve (CCV). CanisterBEIF60JA


4/23

EC -4 EMISSIONS CONTROL SYSTEM[2.0 DOHC]1.Purge Control Solenoid Valve (PCSV) 2. PCV Valve

LEIF603B

PCSV

3. CanisterAEIE302B

PCVValve

4. Catalytic Converter

LEIF013B

Catalytic ConverterLEIF301J

5. Fuel Tank Pressure Sensor (FTPS)6. Canister Close Valve (CCV)

CCVQ

BEIF013D


5/23

GENERAL EC -5[2.7 V6]1. Purge Control Solenoid Valve (PCSV) 2. PCV Valve

LEIF501A

LEIF501W LEIF010C

3. Canister 4. Catalytic Converter

5. Fuel Tank Pressure Sensor (FTPS)6. Canister Close Valve (CCV)

LEIF013B

Catalytic Converter

ccvoBEIF013D


6/23

EC -6 EMISSIONSCONTROL SYSTEMSCHEMATIC DIAGRAM E4290B9C[2.0 DOHC]

INPUT OUTPUT**1. Fuel Injector**2. Ignition Coil**3. Main Relay**4. Purge Control SolenoidValve (PCSV)**5. Idle Speed Control Actuator (ISCA)**6. Oil Control Valve (OCV)**7. Canister Close Valve (CCV)

*1. Mass Air Flow Sensor (MAFS)& Intake Air Temp.Sensor (IATS) G2. Engine Coolant Temp. Sensor (ECTS).----"'-.. E C M .----"'-..*3. Throttle Position Sensor (TPS) L . . . . . . . , . . . o ' L . . . . . . . , . . . o '

*4. Crankshaft Position Sensor (CKPS)*5. Camshaft Position Sensor (CMPS)*6. Knock Sensor (KS)*7. Heated Oxygen Sensor (H02S)-FR*S. Heated Oxygen Sensor (H02S)-RR*9. Oil Temp. Sensor (OTS)*10. Wheel speed Sensor

ECM

BEIF006F


7/23


8/23

EC -8 EMISSIONS CONTROL SYSTEMCRANKCASE EMISSIONCONTROL SYSTEMCOMPONENTS LOCATION EFCF6B9E

[2.0 DOHC] Surge tankBreather hose

Air intake hose

--- During Low Load Operation--- During High Load Operation::=====:::::J Fresh Air

LEIF60JI


9/23

CRANKCASE EMISSION CONTROL SYSTEM EC -9

[2.7 V6]

Blow by hose

P.C.Vvalve

Breather hose

During low load operation

~------ During high load operation< Fresh air

LEIF01JA


10/23

EC -10 EMISSIONS CONTROL SYSTEMPOSITIVE CRANKCASEVENTILATION (PCV) VALVEOPERATION ED61C3E8

Intake manifold side (No vacuum)

Rocker cover sideBEGE0015

Intake manifold side (High vacuum)

Rocker cover sideBEGEOO1T

Engine condition

Restricted

BEGE001U

Engine condition

Small

BEGEOO1V

Not runningPCV valve Not operatingVacuum passage

Intake manifold side (Moderate vacuum)

Rocker cover side

Engine condition

Large

Normal operationPCV valve Properly operatingVacuum passage

Idling or deceleratingPCV valve Fully operatingVacuum passage

Intake manifold side (Low vacuum)

Rocker cover side

Engine condition

Very large

Accelerating and high loadPCV valve Slightly operatingVacuum passage


11/23

CRANKCASE EMISSION CONTROL SYSTEM EC -11REMOVAL EFBDE55F EA92B7B41. Disconnect the ventilation hose from the positivecrankcase ventilation (PCV) valve. Remove the PCVvalve from the rocker cover and reconnect it to theventilation hose.2. Run the engine at idle and put a finger on the openend of the PCV valve and makesure that intakeman-ifold vacuum can be felt.

~NOTEThe plunger inside the PC V valve will move back andforth.

LEIF603E

LEIF010B

3. If vacuum is not felt, dean the PCV valve and venti-lation hose in cleaning solvent, or replace it if neces-sary.

INSPECTION1. Remove the PCV valve.2. Insert a thin stick(A) into the PCV valve(8) from thethreaded side to check that the plunger moves.3. If the plunger does not move, the PCV valve isclogged. Clean it or replace.

LEIF603J

INSTALLATION EF6FEA92Install the PCVvalve and tighten to the specified torque.PCV valve tightening toraue:7.8 - 11.8Nm (0.8 - 1.2kgfm, 5.8 - 8.7IbHt)


12/23

EC -12 EMISSIONS CONTROL SYSTEMEVAPORATIVE AND ORVREMISSION CONTROLSYSTEMDESCRIPTION EB9B3FDCOn-Board Refueling Vapor Recovery (ORVR) system isdesigned to prevent fuel tank vapor (HC) emissions duringrefueling at the gas station.Th is system consists of a fill vent valve, fuel shut-off valve,fuel cut valve (for roll over), two way valve (pressure/vac-uum relief), fuel liquid/vapor separator which is installedCOMPONENTS

beside the filler pipe, charcoal canister which is mountedunder the rear floor LH side member and protector, tubesand miscellaneous connections.While refueling, ambient air is drawn into the filler pipe soas not to emit fuel vapors in the air. The fuel vapor in thetank is then forced to flow into the canister via the fill ventvalve. The fuel liquid/vapor separator isolates liquid fueland passes the pure vapor to the charcoal canister.While the engine is operating, the trapped vapor in thecanister is drawn into the intake manifold and then intothe engine combustion chamber. According to this purgeprocess, the charcoal can ister is purged and recovers itsabsorbing capability.

1

7 813

1. Filler cap 8. EVAP. Hose2. Fuel filler pipe 9. EVAP. Hose3. Check valve 10. Canister4. Fuel tank 11. Drain hose5. ORVR control valve 12. Canister Close Valve (CCV)6. Vapor valve 13. Fuel feed line7. EVAP. Hose 14. Fuel Tank Pressure Sensor (FTPS)

BEGEOO10


13/23

EVAPORATIVE EMISSION CONTROL SYSTEMEVAPORATIVE EMISSIONCONTROL SYSTEM

When the fuel evaporates in the fuel tank, the vaporpasses through vent hoses or tubes to EVAP. canisterfilled with charcoal and the EVAP. canister temporarilyholds it with charcoal. If ECMwants to draw the gatheredvapor into the combustion chambers during certain oper-ating conditions, it will makevacuum in intake manifold tomove it.

DESCRIPTION ECFB77C9Evaporative Emission Control System prevents fuel vaporstored in fuel tank from draining into the atmosphere.

AuxiliaryAir Filter CCV Drain Canister000 HoseD I I I I I I I I I I I I I I I C : : : : : : : : : : : : : : l l l l l l l l l d. C : : : : : : : : J ~ ~ ~ = : : : = : ~VAP Canister

Fuel Filler Cap

IIIIIIIIEVAP Tube

FillerPipe

A: Fil l Vent ValveB: Fuel Cut Valve

~FU91 Feed Lina

Fuel Tank

EC -13

BEGE0011


14/23

EC -14 EMISSIONS CONTROL SYSTEMEVAP. CANISTEREVAP. canister is filled with charcoal and absorbs evapo-rated vapor in fuel tank. The gathered fuel vapor in EVAP.canister is drawn into a intake manifold by ECM when ap-propriate condition is set.PURGE CONTROL SOLENOID VALVE (PCSV)Purge Control Solenoid Valve (PCSV) is installed in thepassage connecting EVAP. canister and intake manifold.It is duty type solenoid valve and is operated by ECM sig-nal. To draw the absorbed vapor into the intake manifold,ECM should open PCSV, otherwise the passage remainsclosed.CANISTER CLOSE VALVE (CCV)The Canister Close Valve (CCV) is located between EVAP.canister air filter and auxiliary canister. It closes off the airinlet to the EVAP. canister for the Evaporative EmissionsSystem leak detection inspection function and also pre-vents fuel vapors from escaping from the EVAP. Canisterwhen the vehicle is not operating.FUEL TANK PRESSURE SENSOR (FTPS)The Fuel Tank Pressure Sensor (FTPS) is an integral partof the monitoring system. The FTPS. checks Purge Con-trol Solenoid Valve (PCSV) operation and leak in the Evap-orative Emission Contorl System by monitoring pressureand vacuum level in the fuel tank during PCSVoperatingcycles.FUEL FILLER CAPA ratchet tightening device on the threaded fuel filler capreduces the chances of incorrect installation, which wouldseal the fuel filler. After the gasket on the fuel filler cap andthe fi ll neck flange contact each other, the ratchet producesa loud clicking noise indicating the seal has been set.EVAP. SYSTEM MONITORINGEvaporative Emission Control Monitoring System consistsof fuel vapor generation, evacuation, and leakage checkstep. At first, the OBD-II system checks if vapor genera-tion due to fuel temperature is small enough to start mon-itoring, and then it evacuates the evaporative system bymeans of PCSV with ramp in order to maintain a certainvacuum level. The final step is to check if there is vacuumloss by any leakage of the system.VAPOR GENERATION CHECKINGDuring stabilization period, the PCSV and the CCV areclosed, and the system pressure is measured as startingpressure (DP_A). After a certain defined period (T1), thesystem pressure (DP_B) is measured again and the dif-ference from the starting pressure is calculated. If this dif-ference(DP _B - DP_A) is bigger than a threshold, there

should be excessive vapor and the monitor is aborted fornext checking. On the contrary, if the difference is lowerthan another negative threshold, PCSV is regarded asmalfunction such as clogged at open position.EVACUATIONPCSV is opened with a certain ramp for the pressure toreach down to a certain level. If pressure can't be low-ered below a threshold, the system is regarded as fuel-cap-opened or having a large leakage.LEAKAGE CHECKINGPCSV is closed and the system wait for a period to get sta-bi lized pressure. During Checking period (T2), the systemmeasures the beginning and the end of the system pres-sure(DP _C, DP_D). The diagnosis value is the pressuredifference corrected by natural vapor generation(DP _B -DP_A) rate from the vapor generation checking step.


15/23

EVAPORATIVE EMISSION CONTROL SYSTEM EC -15EVAP. SYSTEM MONITORING

STATE

FTPS " "".

PCSV

CCV

Determinationof SignalFluctuation

Diagnosisfor Smallvacuation

Delay limefor Leak

Free CheckVapor

Generation Leak Check

-15 hPa

(T1) i l l l l l l ( T 2 )i I CLOSE~. _

OPEN

- - - - - - - - - - - - -BEGE001J


16/23

EC -16SCHEMATIC DIAGRAM E860EBFE

EMISSIONS CONTROL SYSTEM

====='.J pcsv

[2.0 DOHC]SURGE TANK

ECM

FUEL TANK

[2.7 V6]

Pressure regulator

Delivery pipe

ISCA

AIR CLEANER

CANISTER

Fuel pump relay

Fuel filter

Fuel tank

LEIF603F


17/23

EVAPORATIVE EMISSION CONTROL SYSTEM EC -17EVAPORATIVE (EVAP) CANISTERNSPECTION E56BF63D

1. Disconnect the vacuum hose from the throttle body,and connect a vacuum pump to the vacuum hose.2. Check the following points when the engine is cold

[engine coolant temperature 60C(140F) or below]and when it is warm [engine coolant temperatureBOC(176F)or higher].WHEN ENGINE IS COLD

Engine Appliedoperating Resultcondition vacuumIdling 50 kPa Vacuum is held3,000 rpm (7.3 psi)WHEN ENGINE IS WARM

Engine Appliedoperating Resultcondition vacuumIdling 50 kPa Vacuum is held(7.3 psi)Within 3 minutes Try to apply Vacuum isafter engine startat 3,000 rpm vacuum releasedAfter 3 minutes Vacuumhave passed 50 kPa will be heldmomentarily,after engine start (7.3 psi) after which, itwillat 3,000 rpm be released

INSPECTION E61B06A51. Look for loose connections, sharp bends or damage

to the fuel vapor lines.Canister

LEIF013B

2. Look for distortion, cracks or fuel leakage.3. After removing the EVAP.canister, inspect for cracksor damage.

ccvoBEIF013Z


18/23

EC -18 EMISSIONS CONTROL SYSTEMEVAPORATIVE (EVAP) CANISTERPURGE SOLENOID VALVEINSPECTION E6E60DED

~NOTEWhen disconnecting the vacuum hose, make an iden-tification mark on it so that it can be reconnected to itsoriginal position.

1. Disconnect the vacuum hosefrom the solenoid valve.2. Detach the harness connector.3. Connect a vacuum pump to the nipple to which thered-striped vacuum hose was connected.4. Apply vacuum and check when voltage is applied to

the PCSV and when the voltage is discontinued.Battery voltage Normal conditionWhen applied Vacuum is released

When discontinued Vacuum is maintained

LEIF603G

5. Measure the resistance between the terminals of thesolenoid valve.PCSV coil resistance (atl):24.5 - 27.5 D ! l at 20[I(68111)

LEIF603H


19/23

EVAPORATIVE EMISSION CONTROL SYSTEM EC -19FUEL FILLER CAP seal the fuel filler. After the gasket on the fuel filler capand the filler neck flange contact each other, the retchetproduces a loud dicking noise indicating the seal has beenset.ESCRIPTION EE6902EFA ratchet tightening device on the threaded fuel filler capreduces the chances of incorrect installation, which would

Barometric pressure

Fuel tank vacuum ---t..:....__

When fuel tank is under pressure. When fuel tank is under vacuum.

LEGE015A


20/23

EC -20 EMISSIONS CONTROL SYSTEMEXHAUST EMISSIONCONTROL SYSTEMDESCRIPTION E2F1C7EDExhaust emissions (CO, HC, NOx) are controlled by acombination of engine modifications and the addition ofspecial control components.Modifications to the combustion chamber, intakemanifold,camshaft and ignition system form the basic control sys-tem.These items have been integrated into a highly effectivesystem which controls exhaust emissions while maintain-ing good driveability and fuel economy.AIR/FUEL MIXTURE CONTROL SYSTEM[MULTIPORT FUEL INJECTION (MFI) SYSTEM]The MFI system is a system which uses the signals fromthe heated oxygen sensor to activate and control the in-jector installed in the manifold for each cylinder, thus pre-cisely regulating the air/fuel mixture ratio and reducingemissions.This in turn allows the engine to produce exhaust gasesof the proper composition to permit the use of a three waycatalyst. The three way catalyst is designed to convert thethree pollutants (1) hydrocarbons (HC), (2) carbon monox-ide (CO), and (3) oxides of nitrogen (NOx) into harmlesssubstances. There are two operating modes in the MFIsystem.1. Open Loop air/fuel ratio is controlled by informationprogrammed into the ECM.2. Closed Loop air/fuel ratio is adjusted by the ECMbased on information supplied by the oxygen sensor.


21/23

EXHAUST EMISSION CONTROL SYSTEM EC -21CONTINUOUS VARIABLE VALVETIMINGCOMPONENTS LOCATION [2.0DOHC] EFOA7751

d ntake ftamsha

.----- ..... After Main Relay

VARIOUSSENSORAfter Main Relay ECM

CWT Housing

DESCRIPTION EF06BEFBLEIF001P

The CWT (Continuously Variable Valve Timing) which isinstalled on the exhaust camshaft controls intake valveopen and close timing in order to improve engine perfor-mance.The intakevalve timing is optimized by CVVT system de-pending on engine rpm.

This CWT system improves fuel efficiency and reducesNOx emissions at all levels of engine speed, vehiclespeed, and engine load by EGR effect because of valveover-lap optimization.The CVVT changes the phase of the intake camshaft viaoil pressure.It changes the intakevalve timing continuously.

High RETARD ADVANCE~DDc i 5 l 2 iLow High

ENGINE SPEED (RPM)

Driving Condition Intake Valve Timing Effect

Light load (1) Retard Stable combustionPart load (2) Advance Enhanced fuel economy andexhaust emissionsHigh load& Advance Enhanced torqueLow rpm (3)HiH,h load& Retard Enhanced PowerHig rpm (4)

LEIF001Q


22/23

EC -22 EMISSIONS CONTROL SYSTEMOPERATION [2.0 DOHC] EDA2BB54The CWT system makes continuous intake valve timingchanges based on operating condit ions.Intake valve timing is optimized to allow the engine to pro-duce maximum power.Cam angle is advanced to obtain the EGR effect and re-duce pumping loss. The intake valve is closed quickly to

MAXIMUM ADVANCE 40' TDC

reduce the entry of the air/fuel mixture into the intake portand improve the changing effect.Reduces the cam advance at idle, stabil izes combustion,and reduces engine speed.If a malfunction occurs, the CWT system control is dis-abled and the valve timing is fixed at the fully retarded po-sition.

EX

MAXIMUM ADVANCE 40'


23/23

EXHAUST EMISSION CONTROL SYSTEM EC -23Be sure there might be a difference in the position accord-ing to the engine running state (rpm, oil temperature, andoil pressure).

emissions control system

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