Test 6: Positive Crankcase Ventilation (PCV) System

TEST 6: POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM

TEST 6	POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM.
STEP	INSPECTION		ACTION
1	STUCK PCV VALVE CHECK NOTE: This test is intended to diagnose only the PCV valve and related vacuum lines. Key OFF. Verify PCV valve maintenance schedule has been followed. Verify proper PCV valve part number. Verify clean PCV valve. Shake the PCV valve. Does the PCV valve rattle when shaken?	Yes	Reinstall PCV valve. Go to step 2.
1		No	PCV valve is sticking. Replace PCV valve.
2	PCV SYSTEM CHECK Start engine and bring to normal operating temperature. Disconnect closure (fresh air) hose from remote air cleaner or air inlet tube (tube connecting mass air flow sensor and throttle body). Place a stiff piece of paper over the hose end. Wait one minute. Does vacuum hold paper in place?	Yes	PCV system is OK. Reconnect hose. See DIAGNOSTIC INDEX for other causes of vehicle symptoms.
2		No	System is leaking/plugged or EVAP System is leaking. Go to step 3.
3	EVAPORATIVE EMISSION SYSTEM CHECK NOTE: If the evaporative emission hose is not connected to the PCV hose, follow the No Action to Take (Refer to VECI decal). Disconnect evaporative emission hose at connection to PCV hose (if equipped). Cap the connector. Again place a piece of stiff paper over the closure (fresh air) hose end, as in step 2. Wait one minute. Does vacuum hold the paper in place?	Yes	PCV system is OK. Go to step 4 of DTC P0455 pinpoint test. See EVAPORATIVE EMISSION (EVAP) SYSTEM MALFUNCTION .
3		No	Check for vacuum leaks/obstruction in the PCV system (e. g., oil cap, PCV valve, hoses, cut grommets, valve cover bolt torque/gasket leak). Repair as necessary.