2002 Mazda B2300 StandardFACTORY OEM SERVICE PROCEDURE

Positive Crankcase Ventilation System

  1. Stuck PCV Valve Check

    Turn ignition off. Verify PCV valve maintenance schedule has been performed. Remove PCV valve. Verify PCV valve is correct part number. Verify PCV valve is clean. Shake PCV valve. If PCV valve rattles when shaken, reinstall PCV valve. Go to next step. If PCV valve does not rattle when shaken, PCV valve is sticking. Replace faulty PCV valve.

  2. PCV System Check

    Start engine and idle until normal operating temperature is reached. Disconnect closure (fresh air) hose from remote air cleaner or air inlet tube (tube connecting mass air flow sensor and throttle body). Put a stiff piece of paper over hose end and observe. Wait one minute. If vacuum holds paper in place, PCV system is okay. Reconnect hose. See SYMPTOM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article. If vacuum does not hold paper in place, system is leaking, plugged or EVAP system is leaking. Go to next step.

  3. EVAP Emission System Check

    If EVAP emission hose is not connected to PCV hose, perform no further action. Otherwise, disconnect EVAP emission hose at PCV hose connection (if equipped). Cap connector. Again, place a stiff piece of paper over closure (fresh air) hose end. Wait one minute. If vacuum holds paper in place, PCV system is okay. Go to  4 under DTC P0455 OR DTC P1443. If vacuum does not hold paper in place, check for vacuum leaks or obstruction in PCV system. Check oil cap, PCV valve, hoses, grommets, valve cover bolt torque and/or gasket leak. Repair as necessary.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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