Mazda CX-5 Service & Repair Manual: 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 while the engine is idling.
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If vacuum is not applied to the ventilation hose, perform the procedure from Step 3.
NOTE:
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If the PCV valve is operating normally, vacuum occurs in the ventilation hose, however, if the PCV valve is not operating normally, vacuum does not occur in the ventilation hose because the blow-by gas is circulated to the air hose from the ventilation hose.
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Verify the ventilation hose vacuum as follows:
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When the tip of your figure is touching the end of the ventilation hose, the tip of your figure is suctioned by the hose.
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When a thin scrap of paper is contacting the end of the ventilation hose. the paper is suctioned by the hose.
3. Disconnect the negative battery cable..
4. Remove the intake manifold..
5. Remove the PCV valve and the oil separator as a single unit..
6. Verify that there is no airflow when pressure is applied to port B.
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If there is airflow, replace the PCV valve and the oil separator as a single unit..
7. Verify that there is airflow when vacuum is applied to port B.
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If there is no airflow, replace the PCV valve and the oil separator as a single unit..
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 ...
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
...
Other materials:
Cargo Compartment Light
Purpose
The cargo compartment light illuminates the cargo room interior when the
liftgate is opened.
Function
When the liftgate is opened, illuminates by the cargo room light switch turning
on.
Construction
The cargo room light is installed to the trunk side tr ...
Limitations to SRS Air Bag
In severe collisions such as those described previously in “SRS Air Bag Deployment
Criteria”, the applicable SRS air bag equipment will deploy. However, in some accidents,
the equipment may not deploy depending on the type of collision and its severity.
Limitations to front/near front colli ...
Oil Pressure Switch [Fw6 A EL, Fw6 Ax EL]
Purpose/Function
The oil pressure switch detects the engagement pressures of the low clutch,
2-6 brake, R-3-5 brake, and the high clutch.
The oil pressure switch signal is used for automatic shift control, manual
shift control, TCC control, line pressure control, direct electric ...
