EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM [SKYACTIV-X 2.0]

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Evaporative Emission (EVAP) Control System

Purpose, outline

•  Prevents release of evaporative gas into the atmosphere.

•  The intake manifold vacuum introduces evaporative gas to the intake manifold via the charcoal canister and the purge solenoid valve.

System diagram

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Structure

•  The evaporative emission control system consists of the following parts:

Part name	Reference
Purge solenoid valve	(See Purge Solenoid Valve.)
Catch tank	(See Catch Tank.)
Charcoal canister	(See Charcoal Canister.)
Rollover valve	(See Rollover Valve.)
Check valve	(See Check Valve.)
Fuel-filler cap	―

Purge Solenoid Valve

Purpose, function

•  Introduces evaporative gas absorbed by the charcoal canister to the intake manifold.

•  The purge solenoid valve opens according to the control signal from the PCM.

Construction

•  The purge solenoid valve is located near the catch tank.

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•  The purge solenoid valve consists of a coil, spring, and plunger.

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Operation

•  According to the control signal from the PCM, the coil is energized and the plunger is operated to open/close the purge solenoid valve.

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•  When the purge solenoid valve is open, evaporative gas flows from the charcoal canister to the intake manifold side.

Purge solenoid valve open/closed view

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•  For evaporative purge control details, refer to CONTROL SYSTEM. (See PURGE CONTROL [SKYACTIV-X 2.0].)

Catch Tank

Purpose, function

•  Suppresses pulsation occurring before evaporative gas is inducted into the intake manifold.

Construction

•  The catch tank is located near the purge solenoid valve.

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Operation

•  When evaporative gas flows from the charcoal canister to the purge solenoid valve, pulsation is suppressed by passing the evaporative gas through the hollowing of the catch tank.

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Charcoal Canister

Purpose, function

•  Absorbs evaporative gas flowing from the fuel tank to prevent release of the gas into the atmosphere.

Construction

•  The charcoal canister is installed near the main silencer.

•  The charcoal canister has activated charcoal to absorb evaporative gas.

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Operation

•  When the purge solenoid valve is open, evaporative gas, which is absorbed by the activated charcoal, is released by the intake manifold vacuum and the gas flows to the intake manifold.

Charcoal canister

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Rollover Valve

Purpose, function

•  Prevents fuel from flowing into the evaporative gas passage during sudden cornering or vehicle rollover.

Construction

•  The rollover valve is built into the fuel tank.

2WD

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AWD

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•  The rollover valve consists of a float, spring and O-ring (2WD).

2WD

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AWD

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Operation

•  The rollover valve utilizes a combination of float weight, spring force, and buoyancy. When the float is immersed in the fuel, the float (valve) closes to block the sealing surface of the passage.

2WD

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AWD

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Check Valve

Purpose, function

•  The check valve adjusts and maintains the pressure in the fuel tank at a constant pressure.

Construction

•  The check valve is located on the fuel tank.

2WD

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AWD

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Operation

•  The valve moves in response to the difference in air pressure between the fuel tank side and the atmospheric side, thereby changing the path of airflow.

•  When the pressure in the fuel tank becomes negative due to fuel consumption or other factors, the path opens, drawing atmospheric air into the fuel tank.