Lexus SC300 / Lexus SC400. Manual — part 714
SCHEMATIC DRAWING
EC–4
–
EMISSION CONTROL SYSTEMS
Description
PREPARATION
SST (SPECIAL SERVICE TOOL)
RECOMMENDED TOOLS
EQUIPMENT
Part Name
Note
Engine tune–up tester
Engine speed
–
EMISSION CONTROL SYSTEMS
Preparation
EC–5
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
DESCRIPTION
To reduce HC emission, crankcase blow–by gas (HC) is routed through the PCV valve to the air intake cham-
ber for combustion in the cylinders.
OPERATION
EC–6
–
EMISSION CONTROL SYSTEMS
Positive Crankcase Ventilation (PVC) System
INSPECTION OF PCV VALVE
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 air intake chamber 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
INSPECTION OF PCV HOSE AND
CONNECTIONS
VISUALLY INSPECT HOSE, CONNECTIONS AND GASKETS
Check for cracks, leaks or damage.
–
EMISSION CONTROL SYSTEMS
Positive Crankcase Ventilation (PVC) System
EC–7
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