Mazda CX-7 2007 Workshop Manual page 526

POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION[L3 WITH TC]
1. Remove the intake manifold. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC])
2. Remove the PCV valve.
3. Blow through the valve and verify that air flows as
specified.
• If not as specified, replace the PCV valve.
Specification
Condition
Air applied from port A to B
Air applied from port B to A
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WM: CATALYTIC CONVERTER
WARM-UP THREE-WAY CATALYTIC CONVERTER (WU-TWC) INSPECTION[L3 WITH TC]
Caution
• Perform the following procedures, DTC P0421 is indicated only.
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 01-10-9 COMPRESSION
INSPECTION[L3 WITH TC].)
• If the compression pressure is not within the
specification, repair or replace the
malfunction part.
5. Drive the vehicle for 10 min at 65— 96 km/h
{40— 60 mph} to allow the WU-TWC to reach
operating
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 the specified indicated on the M-MDS.
• If it is not as specified, replace the WU-TWC. (See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)
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01-16–14
EMISSION SYSTEM [L3 WITH TC]
Airflow
Yes
No
B
A
DLC-2
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id011639801200
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