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.
Circuit Description
Vapor pressure sensor, canister closed valve Vacuum Switching Valve (VSV) and pressure switching valve VSV are used to detect faults in EVAP system. DTC is set if EVAP system leak is detected or if there is a malfunction in EVAP VSV, pressure switching valve VSV or in vapor pressure sensor. Possible causes are:
- Damaged, disconnected or blocked vacuum hose(s).
- Fuel tank cap is installed incorrectly.
- Defective fuel tank cap.
- Vapor pressure sensor circuit is open or shorted.
- Defective vapor pressure sensor.
- EVAP VSV circuit is open or shorted.
- Defective EVAP VSV.
- Canister closed valve VSV circuit is open or shorted.
- Defective canister closed valve VSV.
- Pressure switching valve VSV circuit is open or shorted.
- Defective pressure switching valve VSV.
- Damaged fuel tank.
- Defective charcoal canister.
- Fuel tank overfill valve cracked or damaged.
- Defective ECM.
NO RELATED
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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.