Mazda CX-5 Service & Repair Manual: Positive Crankcase Ventilation (PCV) Valve
Purpose, Function
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Prevents release of blow-by gas (unburnt gas) into the atmosphere.
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The PCV valve is open/closed by the intake manifold vacuum.
Construction
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The PCV valve is installed to the oil separator.
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The PCV valve consists of a spring and valve.
Operation
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When the valve is pulled by the intake manifold vacuum, blow-by gas flows to the intake manifold.
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Blow-by gas flow amount is adjusted by the spring according to the intake manifold vacuum.
Positive Crankcase Ventilation (PCV) Valve Removal/Installation
1. Disconnect the negative battery cable..
2. Remove the intake manifold..
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.
1
...
Purge Solenoid Valve Inspection
Airflow Inspection
1. Disconnect the negative battery cable..
2. Remove the purge solenoid valve..
3. Inspect airflow between the ports under the following conditions.
...
Other materials:
Engine Coolant Temperature (ECT) Sensor
Purpose/Function
Detects the ECT as basic information for mainly determining the fuel injection
amount.
Detects the ECT and inputs it to the PCM as an ECT signal.
The ECT sensor No.2 is only used for OBD.
Construction
ECT sensor No.1
Installed to the water out ...
Fuel System
Purpose, Outline
A multiple hole type fuel injector has been adopted which provides higher
fuel injection accuracy for improved fuel efficiency and output.
Piston movement-compression by the 4-head cam inside the high pressure fuel
pump heightens the fuel pressure, achieving imp ...
Center Roof Antenna
Purpose, Function
Converts radio broadcast waves to electric signals and sends the signals
to the audio unit.
Construction
A center roof antenna has been adopted which does not require retraction
or removal before going through an automatic car wash machine.
The ...
