Mazda 2: Positive Crankcase Ventilation (PCV)

Mazda 2 2007-2014 Service Manual / Engine / Emission System / Positive Crankcase Ventilation (PCV)

POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION).

2. Remove the fresh-air duct and the air cleaner as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

3. Remove the intake manifold and the fuel distributor component as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

4. Disconnect the PCV hose from the PCV valve.

5. Remove the oil level gauge pipe. (See TIMING CHAIN REMOVAL/INSTALLATION).

6. Remove the PCV valve and the oil separator as a single unit.

7. Install in the reverse order of removal.

Oil separator tightening torque

POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION

Airflow Inspection

1. Disconnect the section (A) of the ventilation hose shown in the figure.

Mazda 2. POSITIVE CRANKCASE VENTILATION (PCV) VALVE

2. Start the engine and verify that vacuum is applied to the end of the disconnected ventilation hose while the engine is idling.

NOTE:

3. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION).

4. Remove the fresh-air duct and the air cleaner as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

5. Remove the intake manifold and the fuel distributor component as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

6. Disconnect the PCV hose from the PCV valve.

7. Remove the oil level gauge pipe. (See TIMING CHAIN REMOVAL/INSTALLATION).

8. Remove the PCV valve and the oil separator as a single unit.

9. Verify that there is no airflow when pressure is applied to port B.

Mazda 2. POSITIVE CRANKCASE VENTILATION (PCV) VALVE

10. Verify that there is airflow when vacuum is applied to port B.

WARM-UP THREE-WAY CATALYTIC CONVERTER (WU-TWC) INSPECTION

CAUTION:

1. Connect the M-MDS to the DLC-2.

2. Start the engine and warm it up to normal operating temperature.

3. Turn off the engine.

4. Verify that the engine compression is within the specification. (See COMPRESSION INSPECTION).

5. Drive the vehicle for 10 min at 65-96 km/h {40-60 mph} to allow the WU-TWC to reach normal operating temperature.

6. Stop the vehicle and leave it in a safe space.

7. Access Test ID 10:21:80 on the "Diagnostic Monitoring Test Result" function.

8. Verify that the test result is within specification indicated on the M-MDS.

ROLLOVER VALVE REMOVAL/INSTALLATION

NOTE:

ROLLOVER VALVE INSPECTION

NOTE:

1. Perform the fuel tank inspection. (See FUEL TANK INSPECTION).

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