Mazda 2007 CX-9, Service Highlights

Page: 87 / 614

EMISSION SYSTEM [MZI-3.5]
01-16–7
01-16
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM STRUCTURE [MZI-3.5]
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•
Consists of a PCV valve, ventilation hose and PCV valve heater fitting.
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POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM OPERATION [MZI-3.5]
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Blowby gas (unburnt gas), including CO and HC exhausted from the crankcase, is forced into the intake air
system and burned in the combustion chamber to prevent its atmospheric release.
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NG: PCV VALVE
POSITIVE CRANKCASE VENTILATION (PCV) VALVE FUNCTION [MZI-3.5]
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Adjusts the amount of blowby gas conducted to the intake air system according to the intake manifold vacuum.
•
Regulates the air (including blowby gas) passing from the cylinder head cover to the dynamic chamber during
low load (when vacuum in the intake manifold is high) to ensure an optimum air/fuel ratio.
•
Heater operates by the signal from PCM when IAT is low, and anti-icing is done.
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POSITIVE CRANKCASE VENTILATION (PCV) VALVE CONSTRUCTION/OPERATION [MZI-3.5]
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The PCV valve is installed on the cylinder head.
•
Consists of a O-ring, spring and valves.
•
The PCV valve ensures the passage of blowby
gas by opening the valve according to the intake
manifold vacuum, and adjusts the amount of gas
by spring force.
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POSITIVE CRANKCASE VENTILATION (PCV) VALVE HEATER FITTING FUNCTION [MZI-3.5]
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Heater operates by the signal from PCM when IAT is low, and anti-icing is done.
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: TO PCM
PCV VALVE
VENTILATION HOSE
PCV VALVE
HEATER FITTING
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PCV VALVE
O-RING
TAB
TO DYNAMIC CHAMBER
FROM CYLINDER HEAD
PCV VALVE
HEATER CONTROL
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