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Emissions Control
System
GENERAL CANISTER
PURGE CONTROL SOLENOID VALVE (PCSV)
CRANKCASE EMISSION CONTROL SYS- FUEL TANK AIR FILTER
FUEL FILLER CAP
TEM
POSITIVE CRANKCASE VENTILATION (PCV)
VALVE EXHAUST EMISSION CONTROL SYSTEM
CONTINUOUS VARIABLE VALVE TIMING (CVVT)
EVAPORATIVE EMISSION CONTROL SYS-
TEM
EC -2 EMISSIONS CONTROL SYSTEM
GENERAL
DESCRIPTION ED0CA305
Components Function Remarks
Crankcase Emission System
- Positive Crankcase Ventilation HC reduction Variable flow rate type
(PCV) valve
Evaporative Emission System
- Evaporative emission canister HC reduction
- Purge Control Solenoid HC reduction Duty control solenoid valve
Valve (PCSV)
Exhaust Emission System
- MFI system (air-fuel mixture CO, HC, NOx reduction Heated oxygen sensor feedback type
control device) CO, HC, NOx reduction Monolithic type
- Three-way catalytic converter
SPECIFICATIONS EF2996DD
PURGE CONTROL SOLENOID VALVE (PCSV)
Specification
Item Specification
Coil Resistance ( ) 14.0 ~ 18.0 [20 (68)]
TIGHTENING TORQUES E34D5DE1
Item N·m kgf·m lbf·m
Positive Crankcase Ventilation Valve 8.0 ~ 12.0 0.8 ~ 1.2 6.0 ~ 8.0
TROUBLESHOOTING E2236ADE
Symptom Suspect area Remedy
Vacuum hose disconnected
Repair or replace
or damaged
Engine will not start or hard to start
Malfunction of the Purge Control
Repair or replace
Solenoid Valve
Vacuum hose disconnected
Repair or replace
or damaged
Malfunction of the PCV valve Replace
Rough idle or engine stalls
Check the system; if there
Malfunction of the evaporative
is a problem, check related
emission canister purge system
components parts
Positive crankcase ventilation Check positive crankcase
Excessive oil consumption
line clogged ventilation system
GENERAL EC -3
COMPONENT LOCATION EB6479B1
1
2
6
3
Fuel Tank
1. Purge Control Solenoid Valve (PCSV)
2. PCV Vlave
3. Canister
4. Catalytic Converter (Bank 1)
5. Catalytic Converter (Bank 2)
6. Fuel Tank Air Filter
SCMEC6001L
EC -4 EMISSIONS CONTROL SYSTEM
1 Purge Control Solenoid Valve (PCSV) 2 Positive Crankcase Ventilation (PCV) Valve
PCV Valve
PCSV
LGLG001L LELG001G
3 Canister 4 Catalytic Converter (Bank 1)
Catalytic Converter (Bank 1)
Canister
SCMEC6002L LELG001H
5 Catalytic Converter (Bank 2) 6 Fuel Tank Air Filtter
Catalytic Converter (Bank 2)
Fuel Tank Air Filter
LELG001I SCMEC6003L
GENERAL EC -5
SCHEMATIC DIAGRAM E6C3F98F
*1. Mass Air Flow Sensor (MAFS) . Ignition Switch **1. Fuel Injector
*2. Intake Air Temperature Sensor (IATS) . Battery Voltage **2. Ignition Coil
*3. Engine Coolant Tmeperature Sensor (ECTS) . Vehicle Speed Signal **3. Purge Control Solenoid
. Coolant Load Signal Valve (PCSV)
*4. Throttle Position Sensor (TPS)
. "PNP" Switch (A/T only) **4-1. CVVT Oil control
*5-1. Camshaft Position Sensor (CMPS) [BANK1]
. Fuel Pump Relay Signal valve (OCV) [BANK1]
*5-2. Camshaft Position Sensor (CMPS) [BANK2]
PCM **4-2. CVVT Oil control
*6. Crankshaft Position Sensor (CKPS) valve (OCV) [BANK2]
*7-1. Knock Sensor (KS) #1 **5-1. Variable Intake Manifold
*7-2. Knock Sensor (KS) #2 Solenoid (VIS) Valve [Surge Tank]
*8-1. Heated Oxygen Sensor (HO2S) [B1/S1] **5-2. Variable Intake Manifold
*8-2. Heated Oxygen Sensor (HO2S) [B1/S2] Solenoid (VIS) Valve [Intake Manifold]
*9-1. Heated Oxygen Sensor (HO2S) [B2/S1] **6. ETC Motor
*9-2. Heated Oxygen Sensor (HO2S) [B2/S2] . Fuel Pump Control
*10. Manifold Absolute Pressure Sensor (MAPS) . Main Relay
*11. CVVT Oil Temperature Sensor (OTS) . Cooler Relay
. Ignition Timing Control
. Disagnosis
Fuel Pump Relay
Battery
Main Relay
PCM
Ignition
Switch
OUTPUT INPUT
Fuel Filter
Fuel Pump
Air Cleaner
Fuel Tank
Fuel Tank
Spark Plug
Air Filter
Fuel Tank
MCC
MCC
LELG001K
EC -6 EMISSIONS CONTROL SYSTEM
CRANKCASE EMISSION
CONTROL SYSTEM
COMPONENTS EAB892E6
Air intake hose
Surge Tank
PCV Valve
Breather hose
During Low Load Operation
During High Load Operation
Fresh Air
LELG001L
CRANKCASE EMISSION CONTROL SYSTEM EC -7
INSPECTION EE69E0AE
1. Disconnect the ventilation hose from the positive
crankcase ventilation (PCV) valve. Remove the PCV
valve from the rocker cover and reconnect it to the
ventilation hose.
2. Run the engine at idle and put a finger on the open
end of the PCV valve and make sure that intake man-
ifold vacuum can be felt.
NOTE
The plunger inside the PCV valve will move back and
forth.
SCMEC6004L
EC -8 EMISSIONS CONTROL SYSTEM
POSITIVE CRANKCASE
VENTILATION (PCV) VALVE
OPERATION EBB0DAB9
Intake manifold side (No vacuum) Intake manifold side (High vacuum)
Rocker cover side Rocker cover side
BEGE001S BEGE001T
Engine condition Not running Engine condition Idling or decelerating
PCV valve Not operating PCV valve Fully operating
Vacuum passage Restricted Vacuum passage Small
Intake manifold side (Moderate vacuum) Intake manifold side (Low vacuum)
Rocker cover side Rocker cover side
BEGE001U BEGE001V
Engine condition Normal operation Engine condition Accelerating and high load
PCV valve Properly operating PCV valve Slightly operating
Vacuum passage Large Vacuum passage Very large
CRANKCASE EMISSION CONTROL SYSTEM EC -9
REMOVAL EB3C969B
1. Disconnect the vacuum hose (A) and remove the PCV
valve (B).
A
B
SCMEC6005L
INSPECTION EEDF42DC
1. Remove the PCV valve.
2. Insert a thin stick(A) into the PCV valve(B) from the
threaded side to check that the plunger moves.
3. If the plunger does not move, the PCV valve is
clogged. Clean it or replace.
A
B
EERF600J
INSTALLATION E7FA321E
Install the PCV valve and tighten to the specified torque.
PCV Valve installation : 7.8 ~ 11.8 N·m (0.8
~ 1.2 kgf·m, 5.8 ~ 8.7lbf·ft)
EC -10 EMISSIONS CONTROL SYSTEM
EVAPORATIVE EMISSION passes through vent hoses or tubes to the canister filled
with charcoal and the canister temporarily holds the vapor
CONTROL SYSTEM in the charcoal. If ECM determines to draw the gathered
vapor into the combustion chambers during certain oper-
DESCRIPTION E4D6C1B7
ating conditions, it will use vacuum in intake manifold to
move it.
Evaporative Emission Control System prevents fuel va-
por stored in fuel tank from vaporizing into the atmos-
phere. When the fuel evaporates in the fuel tank, the vapor
Fuel Tank
Air Filter
Engine
PCSV
Air Cleaner
Canister
Fuel Rail &
Injector
Fuel Filler Cap
Filler A
Pipe
B
A: 2-Way & Cut Valve
B: ORVR Valve
Fuel
Joint Pump
Hose Fuel Feed Line
EVAP Tube
Fuel Tank
LEKG033A
EVAPORATIVE EMISSION CONTROL SYSTEM EC -11
CANISTER INSPECTION E2BCDF9E
Canister is filled with charcoal and absorbs evaporated va- 1. Disconnect the vacuum hose from the throttle body,
por in fuel tank. The gathered fuel vapor in canister is and connect a vacuum pump to the vacuum hose.
drawn into the intake manifold by the ECM/PCM when ap-
propriate conditions are set. 2. Check the following points when the engine is cold
[engine coolant temperature 60 C(140 F) or below]
PURGE CONTROL SOLENOID VALVE (PCSV) and when it is warm [engine coolant temperature
80 C(176 F) or higher].
Purge Control Solenoid Valve (PCSV) is installed in the
passage connecting canister and intake manifold. It is a WHEN ENGINE IS COLD
duty type solenoid valve and is operated by ECM/PCM sig-
nal. To draw the absorbed vapor into the intake manifold, Engine
Applied
the ECM/PCM will open the PCSV, otherwise the passage operating Result
vacuum
remains closed. condition
FUEL FILLER CAP Idling 50 kPa
Vacuum is held
3,000 rpm (7.3 psi)
A ratchet tightening device on the threaded fuel filler cap
reduces the chances of incorrect installation, which would
seal the fuel filler. After the gasket on the fuel filler cap and WHEN ENGINE IS WARM
the fill neck flange contact each other, the ratchet produces
Engine
a loud clicking noise indicating the seal has been set. Applied
operating Result
vacuum
condition
50 kPa
Idling Vacuum is held
(7.3 psi)
Within 3 minutes
Try to apply Vacuum is
after engine start
vacuum released
at 3,000 rpm
Vacuum
After 3 minutes
will be held
have passed 50 kPa
momentarily,
after engine start (7.3 psi)
after which, it will
at 3,000 rpm
be released
EC -12 EMISSIONS CONTROL SYSTEM
CANISTER INSPECTION E84A19DD
1. Look for loose connections, sharp bends or damage
REMOVAL E2209E60
to the fuel vapor lines.
1. Disconnect the vacuum hoses (A,B). 2. Look for distortion, cracks or fuel damage.
3. After removing the canister, inspect for cracks, dam-
age or saturated canister.
A
C
B
A
B
A : To Fuel Tank Air Filter
SCMEC6007L
B : To Intake Manifold
C : To Fuel Tank
2. Disconnect the vacuum hose quick-connector (A).
SCMEC6006L
INSTALLATION EF0FCEBE
Install the canister according to the reverse order of "RE-
MOVAL" procedure.
A
SCMEC6008L
3. Unscrew the mounting bolts (A) and remove the can-
ister assembly (B) from the vehicle.
A B A
SCMEC6009L
EVAPORATIVE EMISSION CONTROL SYSTEM EC -13
PURGE CONTROL SOLENOID
VALVE (PCSV)
INSPECTION ECF3916E
NOTE
When disconnecting the vacuum hose, make an iden-
tification mark on it so that it can be reconnected to its
original position.
1. Disconnect the vacuum hose from the solenoid valve.
2. Detach the harness connector.
3. Connect a vacuum pump to the nipple which is con-
nected to intake manifold.
4. Apply vacuum and check when voltage is applied to
the PCSV and when the voltage is discontinued.
Battery voltage Normal condition
When applied Vacuum is released
When discontinued Vacuum is maintained
5. Measure the resistance between the terminals of the
solenoid valve.
PCSV coil resistance( ) : 14.0 ~ 18.0 at 20 (68)
EC -14 EMISSIONS CONTROL SYSTEM
FUEL TANK AIR FILTER
REPLACE EDCFC370
1. Remove the rear left wheel house inner cover (Refer
to "BD" Group in this WORKSHOP MANUAL).
2. Disconnect the hose (A) connected with the canister
and remove the fuel tank air filter (B) from the filler-
neck assembly (C).
B
C
A
SCMEC6010L
EVAPORATIVE EMISSION CONTROL SYSTEM EC -15
FUEL FILLER CAP seal the fuel filler. After the gasket on the fuel filler cap
and the filler neck flange contact each other, the ratchet
produces a loud clicking noise indicating the seal has been
DESCRIPTION EDD25DE3
set.
A ratchet tightening device on the threaded fuel filler cap
reduces the chances of incorrect installation, which would
Barometric pressure
Fuel vapor pressure
Fuel tank vacuum
When fuel tank is under pressure. When fuel tank is under vacuum.
LEGE015A
EC -16 EMISSIONS CONTROL SYSTEM
EXHAUST EMISSION
CONTROL SYSTEM
DESCRIPTION EBA45808
Exhaust emissions (CO, HC, NOx) are controlled by a
combination of engine modifications and the addition of
special control components.
Modifications to the combustion chamber, intake manifold,
camshaft and ignition system form the basic control sys-
tem.
These items have been integrated into a highly effective
system 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 from
the 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 reducing
emissions.
This in turn allows the engine to produce exhaust gases
of the proper composition to permit the use of a three way
catalyst. The three way catalyst is designed to convert the
three pollutants (1) hydrocarbons (HC), (2) carbon monox-
ide (CO), and (3) oxides of nitrogen (NOx) into harmless
substances. There are two operating modes in the MFI
system.
1. Open Loop air/fuel ratio is controlled by information
programmed into the ECM.
2. Closed Loop air/fuel ratio is adjusted by the ECM
based on information supplied by the oxygen sensor.
EXHAUST EMISSION CONTROL SYSTEM EC -17
CONTINUOUS VARIABLE VALVE
TIMING (CVVT)
DESCRIPTION ECBE8ABD
CMPS
Intake
Camshaft VARIOUS
After Main Relay
SENSOR
RETARD ADVANCE CVVT PCM
Advance
CVVT Chamber After Main Relay
Retard
Chamber Housing
Vane
DRAIN
OCV
Vane
From DRAIN
Oil Pump
CVVT Housing
UEBG013A
The CVVT (Continuously Variable Valve Timing) which is This CVVT system improves fuel efficiency and reduces
installed on the exhaust camshaft controls intake valve NOx emissions at all levels of engine speed, vehicle
open and close timing in order to improve engine perfor- speed, and engine load by EGR effect because of valve
mance. over-lap optimization.
The intake valve timing is optimized by CVVT system de- The CVVT changes the phase of the intake camshaft via
pending on engine rpm. oil pressure.
It changes the intake valve timing continuously.
High RETARD ADVANCE
Driving Condition Intake Valve Timing Effect
LOAD
3 4 Light load (1) Retard Stable combustion
Part load (2) Advance Enhanced fuel economy and
exhaust emissions
2 High load& Advance Enhanced torque
Low rpm (3)
1 High load&
High rpm (4) Retard Enhanced Power
Low High
ENGINE SPEED (RPM)
LEIF001Q
OPERATION EA7ECAF2 Intake valve timing is optimized to allow the engine to pro-
duce maximum power.
The CVVT system makes continuous intake valve timing Cam angle is advanced to obtain the EGR effect and re-
changes based on operating conditions. duce pumping loss. The intake valve is closed quickly to
EC -18 EMISSIONS CONTROL SYSTEM
reduce the entry of the air/fuel mixture into the intake port If a malfunction occurs, the CVVT system control is dis-
and improve the changing effect. abled and the valve timing is fixed at the fully retarded po-
Reduces the cam advance at idle, stabilizes combustion, sition.
and reduces engine speed.
TDC
IN 2
EX IN 2
IN 1 EX
IN 1
SHORT OVERLAP
LONG OVERLAP
RETARD HOLD ADVANCE
Rotor
Vane Housing
Vane
Retard
Chamber
Retard
Chamber
Retard
Chamber
P P P
UEBG014A
1. The above figure shows the relative operation struc- Be sure there might be a difference in the position accord-
tures of the housing vane to the rotor vane. ing to the engine running state (rpm, oil temperature, and
oil pressure).
2. If the CVVT is held a certain control angle, to hold this
state, oil is replenished as much as oil leaks from the
oil pump.
The OCV (Oil-flow Control Valve) spool location at this time
is as follows.
Oil pump Advance oil chamber (Little by little open
the inflow side to the advance oil chamber) Almost
close the drain side