Lexus SC300 / Lexus SC400. Manual — part 335

INSPECTION OF PCV VALVE

1.

REMOVE PCV VALVE

2.

ATTACH CLEAN HOSE TO PCV VALVE

3.

BLOW AIR FROM CYLINDER HEAD SIDE
Check that air passes through easily.
NOTICE: Do not suck air through the valve.
Petroleum substances inside the valve are harmful.

4.

BLOW AIR FROM INTAKE MANIFOLD SIDE
Check that air passes through with difficulty.
If the PCV valve fails either check, replace it.

5.

REINSTALL PCV VALVE

INSPECTION OF PCV HOSES AND
CONNECTORS

VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

Check for cracks, leaks or damage.

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EMISSION CONTROL SYSTEMS

Positive Crankcase Ventilation (PVC) System

EC–5

SCHEMATIC DRAWING

PREPARATION

SST (SPECIAL SERVICE TOOLS)

Illustration

Part No.

Part Name

Note

09843–18020

Diagnosis Check Wire

for EGR system inspection

RECOMMENDED TOOLS

Illustration

Part No.

Part Name

Note

09082–00015

TOYOTA Electrical
Tester

EQUIPMENT

Part Name

Note

Vacuum gauge

EGR system

Engine tune–up tester

Engine speed

SSM (SPECIAL SERVICE MATERIALS)

Part Name

Part No.

Note

08833–00070

THREE
BOND 1324

BVSV

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EMISSION CONTROL SYSTEMS

Description, Preparation

EC–3

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

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EMISSION CONTROL SYSTEMS

Positive Crankcase Ventilation (PVC) System