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Test Hg: PCV System: Testing

  1. 1) Check Power And Ground Circuits At Heated PCV Valve

    Disconnect the heated PCV valve harness connector. Start engine. Measure the voltage at the heated PCV valve harness connector. If the voltage is greater than 10.5 volts, go to next step. If the voltage is 10.5 volts or less, go to step  3.

  2. 2) Check Resistance Of Heated PCV Valve

    Measure the resistance between both pins at the heated PCV valve. If the resistance reading is 28-35 ohms, go to step  4). If the resistance reading is not 28-35 ohms, replace heated PCV valve.

  3. 3) Check Battery Voltage To Heated PCV Valve Circuit

    Measure B(+) circuit voltage at the heated PCV valve harness connector. If the voltage greater than 10.5 volts, check the heated PCV valve ground circuit. Repair as necessary. Turn ignition switch to OFF position. Check condition of related fuse(s). If okay, repair open circuit. If fuse is damaged, check B(+) circuit for short to ground before replacing.

  4. 4) Stuck PCV Valve Check

    Ensure PCV valve maintenance schedule has been followed. Ensure proper PCV valve is installed. Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, install PCV valve and go to next step. Replace PCV valve if it does not rattle when shaken. Verify repair.

  5. 5) PCV System Check

    Start engine and warm to normal operating temperature. Disconnect fresh air hose from remote air cleaner or outlet tube connecting MAF sensor to throttle body. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, go to next step. If vacuum from hose holds paper in place for one minute, PCV system is okay. Return to appropriate symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - CNG, FLEX-FUEL & GASOLINE article to complete testing.

  6. 6) Evaporative Emission System Check

    Disconnect evaporative emission hose from PCV system and plug connector. Again, place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, isolate vacuum leak or restriction in PCV system and repair as necessary. If vacuum from hose holds paper in place for one minute, PCV system is working properly at this time. Go to SYSTEM TESTS (EVAPORATIVE EMISSION) to diagnose EVAP system vacuum leak.
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