Hyundai Santa Fe (TM): Evaporative Emission Control System - Emission Control SystemHyundai Santa Fe (TM): 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

Canister
Canister is filled with charcoal and absorbs evaporated vapor in 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)
Purge Control Solenoid Valve (PCSV) is installed in the passage connecting canister and 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 on the threaded fuel filler cap reduces the chances of incorrect installation, which would seal the fuel filler. After the gasket on the fuel filler cap and the fill neck flange contact each other, the ratchet produces a loud clicking noise indicating the seal has been set.

Canister. Repair procedures

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.
Disconnect the vent hose (A).

4.
Disconnect the vapor hose quick-connector (A).

5.
Remove the canister (A) after loosening the mounting nuts.
Tightening Torque :
7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.7 - 8.7 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 ↔ Atmosphere
B : Canister ↔ Fuel Tank
C : Canister ↔ Intake Manifold

Fuel Filler Cap. Description and operation

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.

Fuel Tank Air Filter. Repair procedures

Removal
  
Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) 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 (A) after loosening the mounting bolts.
Tightening torque :
7.9 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft)

Installation
1.
Install in the reverse order of removal.
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