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.
Monitor Description: Notes
If the engine is started, the purge flow monitor operates. The purge flow monitor consists of two monitors. First monitoring is performed every time, and the second monitoring is performed as necessary.
- First monitoring
When the engine is running, and purge VSV is ON (Open), the ECM monitors the purge flow rate by measuring the variation of EVAP pressure. If the pressure variation exceeds the threshold value, the ECM initiates second monitoring.
- Second monitoring
The vent valve turns to ON (Closed) and EVAP pressure monitoring is carried out. If the pressure fluctuation exceeds the threshold, the ECM judges that the purge VSV is in the stuck close status and illuminates the MIL, and stores DTC P0441 (2 trip detection logic).
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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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