Mazda 3 Service Manual: Positive Crankcase Ventilation (PCV) Valve Inspection [Mzr 2.0, Mzr 2.5]
Airflow Inspection
1. Disconnect the section (A) of the 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.
NOTE:
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Because it is difficult to directly inspect the PCV valve, determine the integrity of the PCV valve by performing a simple inspection of the ventilation hose airflow condition.If the PCV valve is operating normally, vacuum occurs in the ventilation hose, however, if there is a malfunction in the PCV valve, positive pressure occurs 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 using the following methods:
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When the tip of your finger touches the end of the ventilation hose, it is suctioned by the hose.
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When a thin scrap of paper contacts the end of the ventilation hose, it is suctioned by the hose.
3. If it can be verified that vacuum occurs in the ventilation hose, the positive crankcase ventilation (PCV valve) system is determined to be normal.
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If positive pressure occurs in the ventilation hose, perform the procedure from Step 4 to examine the PCV valve.
4. Remove the battery cover..
5. Disconnect the negative battery cable..
6. Remove the intake manifold and the fuel distributor component as a single unit..
7. Remove the PCV valve and the oil separator as a single unit..
8. Verify that there is no airflow when pressure is applied to port A.
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If there is airflow, replace the PCV valve..
9. Verify that there is airflow when vacuum is applied to port A.
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If there is no airflow, replace the PCV valve..
EGR Valve Removal/Installation [Mzr 2.0, Mzr 2.5]
1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Drain the engine coolant from the radiator..
4. Remove the air cleaner and the air hose as a single unit..
5. Remove ...
Positive Crankcase Ventilation (PCV) Valve Removal/Installation [Mzr 2.0, Mzr
2.5]
1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Remove the intake manifold and the fuel distributor component as a single
unit..
4. Remove in the order indicated in ...
Other materials:
Checking Tire Pressure
When you check the air pressure, make sure the tires are cold —meaning
they are not hot
from driving even a mile.
Remove the cap from the valve on one tire.
Firmly press a tire gauge onto the valve.
Add air to achieve recommended air pressure.
If you overfill the tire, release air by ...
Power Systems Personalization Features Setting Procedure
NOTE:
Use the IDS (laptop PC) because the PDS (Pocket PC) does not support the
POWER SYSTEMS PERSONALIZATION FEATURES SETTING PROCEDURE.
1. Connect the M-MDS to the DLC–2.
2. After the vehicle is identified, select the following items from the initial
screen of the M-MDS.
...
Engine Oil Level Inspection [Mzr 2.0, Mzr 2.5]
1. Position the vehicle on level ground.
2. Warm up the engine.
3. Stop the engine and allow at least 5 min before continuing.
4. Remove the dipstick, wipe it cleanly, and reinstall it fully.
5. Remove the dipstick and verify that the oil level is between the F and L marks
on the dipstick. ...
