Lexus RX300 (MCU15). Service manual — part 426
EC026–03
–
EMISSION CONTROL
EMISSION CONTROL SYSTEM
EC–1
LEXUS RX300 (RM785E)
EMISSION CONTROL SYSTEM
PURPOSE
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from the
engine ((3) and (4)), 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 these table.
System
Abbreviation
Function
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Three–Way Catalytic Converter
(4) Electronic Fuel injection*
PCV
EVAP
TWC
EFI
Reduces HC
Reduces evaporated HC
Reduces HC, CO and NOx
Injects a precisely timed, optimum amount of fuel for reduced
exhaust emissions
Remark: * For inspection and repair of the EFI system, refer to the FI section of this manual.
EC027–05
B12168
VSV for EVAP
Vacuum Surge Tank
Charcoal Canister
TWC
PCV Valve
WU–TWC
(for Bank 2)
WU–TWC
(for Bank 1)
A/F Sensor
(Bank 2 Sensor 1)
A/F Sensor
(Bank 1 Sensor 1)
EC–2
–
EMISSION CONTROL
PARTS LAYOUT AND SCHEMATIC DRAWING
LEXUS RX300 (RM785E)
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION
EC028–05
B12169
A/F Sensor
(Bank 2 Sensor 1)
Heated Oxygen Sensor
(Bank 1 Sensor 2)
TWC
Fuel Tank
Charcoal
Canister
WU–TWC
(for Bank 2)
Air Cleaner
WU–TWC
(for Bank 1)
VSV for EVAP
A/F Sensor
(Bank 1 Sensor 1)
–
EMISSION CONTROL
PARTS LAYOUT AND SCHEMATIC DRAWING
EC–3
LEXUS RX300 (RM785E)
DRAWING
B00640
PCV Valve
EC029–04
P02006
Clean Hose
Cylinder Head Side
P02477
Intake Manifold
Side
P12931
EC–4
–
EMISSION CONTROL
POSITIVE CRANKCASE VENTILATION (PCV)
SYSTEM
LEXUS RX300 (RM785E)
POSITIVE CRANKCASE
VENTILATION (PCV) SYSTEM
INSPECTION
1.
REMOVE PCV VALVE
(a)
Disconnect the PCV hose from the PCV valve.
(b)
Remove the PCV valve.
2.
INSTALL CLEAN HOSE TO PCV VALVE
3.
INSPECT PCV VALVE OPERATION
(a)
Blow air into the cylinder head side, and check that air
passes through easily.
CAUTION:
Do not suck air through the valve.
Petroleum substances inside the valve are harmful.
(b)
Blow air into the intake manifold side, and check that air
passes through with difficulty.
If operation is not as specified, replace the PCV valve.
4.
REMOVE CLEAN HOSE FROM PCV VALVE
5.
REINSTALL PCV VALVE
6.
VISUALLY INSPECT HOSES, CONNECTIONS AND
GASKETS
Check for cracks, leaks or damage.
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