Mazda CX-5 Service & Repair Manual: Positive Crankcase Ventilation (PCV) System
Purpose, Outline
-
Prevents release of blow-by gas (unburnt gas) into the atmosphere.
-
The intake manifold vacuum introduces blow-by gas to the intake manifold via the PCV valve and the ventilation hose.
System Diagram
Structure
-
The positive crankcase ventilation system consists of the following parts:
|
Part name |
Reference |
|
PCV valve |
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE [SKYACTIV-G 2.0].) |
|
Ventilation hose |
? |
Exhaust Gas Purification System
Purpose, Outline
Purifies contaminants (HC, CO, NOx) in the exhaust gas by utilizing the chemical
reactions of the three-way catalytic converter.
System Diagram
Structure
T ...
Positive Crankcase Ventilation (PCV) Valve Inspection
Airflow Inspection
1. Disconnect the section (A) of ventilation hose shown in the figure.
2. Start the engine and verify that vacuum is applied to the end of the disconnected
ventilation hose ...
Other materials:
Front Map Light
Purpose
The front map lights shine light at the front of the vehicle interior.
Function
The front map lights illuminate when the map light switch is turned on.
Illuminates according to the lock condition of the driver's door and open/close
conditions of the doors u ...
Rollover Valve
Purpose, Function
Prevents fuel from flowing into the evaporative gas passage during sudden
cornering or vehicle rollover.
Construction
The rollover valve is built into the fuel tank.
U.S.A. and CANADA
Except U.S.A. and CANADA
The rollover valve con ...
Oil Control Valve (OCV) Inspection
Coil Resistance Inspection
1. Disconnect the negative battery cable..
2. Remove the plug hole plate..
3. Disconnect the OCV connector.
4. Measure the resistance between terminals A and B using an ohmmeter.
OCV coil resistance
6.9—7.5 ohms [20°C {68°F}]
If not as ...
