If only a small amount of fuel is in the fuel tank it takes longer for the EVAP pressure to stabilize

Operation A: Atmospheric Pressure Measurement

Purge VSV: OFF\

Operation B, E:

Reference Pressure Measurement

- Canister

Canister Pressure Sensor

Vent Valve: OFF (vent) Canister Pump Module

-Canister Filter

Leak Detection Pump: OFF

OFF (vent)

Operation C: EVAP System Pressure Measurement

ON (closed)

Reference Orifice (0.02 inch)

Operation D: Purge VSV Monitor



Atmospheric Pressure

Negative Pressure


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Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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