Hyundai Tucson: Emission Control System / Evaporative Emission Control System

Description and Operation

- Description Evaporative Emission Control System prevents fuel vapor stored in fuel tank from vaporizing into the atmosphere. When the fuel evaporates in the fuel tank, the vapor passes through vent hoses or tubes to the canister filled with charcoal and the canister temporarily holds the vapor in the charcoal. If ECM determines to draw the gathered vapor into the combustion chambers during certain operating conditions, it will use vacuum in intake manifold to move it.

Schematic Diagrams

- Schematic Diagram

• MAPS : Manifold Absolute Pressure Sensor

• PCSV : Purge Control Solenoid Valve

• MAFS : Mass Air Flow Sensor

• FTPS : Fuel Tank Pressure Sensor

• CCV : Canister Close Valve

Canister

- Removal

   

• Be careful not to damage the parts located under the vehicle (floor under cover, canister, fuel tank) when raising the vehicle using the lift.(Refer to General Information - "Lift and Support Points")

1.Turn the ignition switch OFF and disconnect the battery (-) terminal.

2.Remove the floor under cover (A).

Tightening Torque :7.9 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft)

3.Separate the ventilation hose (A).

4.Disconnect the canister close valve connector (A).

5.Remove the wiring fixing clip (A).

6.Lifting the fixed part (A) and then rotating CCV (B) 30 degrees in the direction of the arrow.

7.Disconnect the vapor hose quick-connector (A).

8.Remove the canister (A) after loosening the mounting nuts.

Tightening Torque :18.6 - 23.5 N.m (1.9 - 2.4 kgf.m, 13.7 - 17.4 lb-ft)

- Installation

1.Install in the reverse order of removal.

- Inspection

1.Check for the following items visually.

– Cracks or leakage of the canister

– Loose connection, distortion, or damage of the vapor hose/tube

A : Canister ↔ AtmosphereB : Canister ↔ Fuel TankC : Canister ↔ Intake Manifold

Fuel Tank Air Filter

- Removal

   

• Be careful not to damage the parts located under the vehicle (floor under cover, canister, fuel tank) when raising the vehicle using the lift.(Refer to General Information - "Lift and Support Points")

1.Turn the ignition switch OFF and disconnect the battery (-) terminal.

2.Lift the vehicle.

3.Remove the rear-left wheel & tire and wheel house cover.

4.Separate the ventilation hoses (A).

5.Remove the fuel tank air filter (B) after loosening the mounting bolts (A).

6.Remove the ventilation hose (A) from the fuel tank air filter.

- Installation

1.Install in the reverse order of removal.

Fuel Filler Cap

- Description A ratchet tightening device on the threaded fuel filler cap reduces the chances of incorrect installation, which seals the fuel filler. After the gasket on the fuel filler cap and the filler neck flange contact each other, the ratchet produces a loud clicking noise indicating the seal has been set.