Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Crankcase Ventilation Valve
FUNCTIONS WITHIN THE SYSTEM
ECM detects malfunction of crankcase ventilation system by operating crankcase ventilation valve and control inside pressure of crankcase.
INDIVIDUAL FUNCTION WITHIN THE SYSTEM
Crankcase ventilation valve opens and closes air cleaner side of fresh air passage between rocker cover and air duct.
INDIVIDUAL OPERATION
Crankcase ventilation valve is activated by ON/OFF signals from ECM. ON signal from ECM closes the valve and fresh air flow is shut off.
Component Location
Crankcase ventilation valve is installed at the air duct.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.