Checking Ignition Wire / Checking P.C.V. System / Checking A.T.C. Air Cleaner

MA-48prose procedure

Checking Ignition Wire (High Tension Wire)

1
Inspect ignition wires for cracks, damage, burned terminals and proper fit.
2
Measure the resistance of ignition wires by shaking them and checking for intermittent breaks. Resistance: Less than 30 kΩ
If N.G., replace with new ones.
SMA015A

Checking Positive Crankcase Ventilation (P.C.V.) System

CHECKING P.C.V. VALVE

With engine running at idle, remove ventilation hose from P.C.V. valve; if valve is working properly, a hissing noise will be heard as air passes through it and a strong vacuum should be felt immediately when a finger is placed over valve inlet.

Checking Ventilation Hoses

1
Check hoses and hose connections for leaks.
SMA372C
2
Disconnect all hoses and clean with compressed air. If any hose cannot be freed of obstructions, replace.

Checking Automatic Temperature Control (A.T.C.) Air Cleaner

1
Check that vacuum hoses (Intake manifold to temperature sensor and vacuum motor) are securely connected.
SEF255A
2
Inspect each hose for cracks or distortion.
3
Inspect A.T.C. system for proper function.
4
Make sure that air control valve moves when engine is raced under no-load.
5
Make sure that air control valve gradually closes when engine warm-up advances.
Refer to section EF & EC.

A.T.C. air control valve function

Engine	Temperature	Air control valve position	Intake air temperature
Stopped	Any	Closed	—
At idle	Low	Open	Hot
At idle	High	Closed	Cool

Stopped

TemperatureAny

Air control valve positionClosed

Intake air temperature—

At idle

TemperatureLow

Air control valve positionOpen

Intake air temperatureHot

At idle

TemperatureHigh

Air control valve positionClosed

Intake air temperatureCool

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