Evaporative Emission Control System: Overview Kia Sedona II facelift

DESCRIPTION

This system consists of a fill vent valve, fuel shut-off valve, fuel cut valve (for roll over), two way valve (pressure/vacuum relief), fuel liquid/vapor separator which is installed beside the filler pipe, charcoal canister which is mounted under the rear floor LH side member and protector, tubes and miscellaneous connections.

While refueling, ambient air is drawn into the filler pipe so as not to emit fuel vapors in the air. The fuel vapor in the tank is then forced to flow into the canister via the fill vent valve. The fuel liquid/vapor separator isolates liquid fuel and passes the pure vapor to the charcoal canister.

While the engine is operating, the trapped vapor in the canister is drawn into the intake manifold and then into the engine combustion chamber. According to this purge process, the charcoal canister is purged and recovers its absorbing capability.

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1. Disconnect the vacuum hose from the throttle body, and connect a vacuum pump to the vacuum hose.
2. Check the following points when the engine is cold [engine coolant temperature 60°C (140°F) or below] and when it is warm [engine coolant temperature 80°C (176°F) or higher]. WHEN ENGINE IS COLD ENGINE OPERATING CONDITION Engine operating condition Applied vacuum Result Idling 50 kPa (7.3 psi) Vacuum is held 3,000 rpm WHEN ENGINE IS WARM ENGINE OPERATING CONDITION Engine operating condition Applied vacuum Result Idling 50 kPa (7.3 psi) Vacuum is held Within 3 minutes after engine start at 3,000 rpm Try to apply vacuum Vacuum is released After 3 minutes have passed after engine start at 3,000 rpm 50 kPa (7.3 psi) Vacuum will be held momentarily, after which, it will be released

The evaporative emission control system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Canister Close Valve (CCV) closes off the air inlet into the canister for leak detection of the evaporative emission system. The CCV also prevents fuel vapors from escaping from the canister. When the engine purges the HC vapors from the canister, the clean air comes into the canister through the canister air-filter and the CCV.

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SPECIFICATION

RESISTANCE SPECIFICATION

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1. Remove the canister cover (A) with unscrewing the mounting bolts (B).
2. Disconnect the vacuum hoses (A, B, C).
3. Disconnect the canister close valve connector (A).
4. Unscrew the mounting bolts (A, B) and remove the canister.