Hyundai Tucson: Evaporative Emission Control System - Description
Description
The 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 a canister filled with charcoal.
The canister temporarily holds the vapor in the charcoal. The ECM will control the system in order to draw the gathered vapor into the combustion chambers during certain operating conditions. Engine manifold vacuum is used to draw the vapor into intake manifold.
Schematic Diagram
Canister
The Canister is filled with charcoal and absorbs evaporated fuel vapor from the fuel tank. The gathered fuel vapor in canister is drawn into the intake manifold by the ECM/PCM when appropriate conditions are set.
Purge Control Solenoid Valve (PCSV)
The Purge control solenoid valve (PCSV) is installed in the passage connecting the canister to the intake manifold. It is a duty type solenoid valve and is operated by ECM/PCM signal.
To draw the absorbed vapor into the intake manifold, the ECM/PCM will open the PCSV, otherwise the passage remains closed.
Fuel Filler Cap
A ratchet tightening device in the threaded fuel filler cap reduces the chances of incorrect installation, when sealing the fuel filler. After the gasket on the fuel filler cap and the fill neck flange make contact, the ratchet produces a loud clicking noise indicating the seal has been set.
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Evaporative Emission Control System - Removal
Removal
WARNING
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")
Turn
Evaporative Emission Control System- Installation
Install in the reverse order of removal.
Inspection
Check for the following items visually.
Cracks or leakage of the canister
Loose connection, distortion, or damage of the vapor hose/tube
Canister→ Atmosphere
Canister →
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Components and Components Location
Components Location
Engine Control Module (ECM)
Mass Air Flow Sensor (MAFS)
Manifold Absolute Pressure Sensor (MAPS)
Intake Air Temperature Sensor (IATS)
Boost Pressure Sensor (BPS)
Engine Coolant Temperature Sensor (E
Tail Gate Window Glass - Installtion
Using a cutting knife (A), remove the remaining sealant (B) on the body
panel.
Apply the body primer to the bonding surface of body panel.
WARNING
Be careful not to touch the surface covered with the primer
because touching
Information
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