General Information

Engine Control
P0447 Evaporative Emission System-Vent Control Circuit Open - General Information

Component Location





General Description

The evaporative emissions system prevents hydrocarbon (HC) vapors from the fuel system 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. this is done for leak detection of the evaporative emission system. 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 which is normally open. When checking the system for leaks, the CCV is closed to trap vacuum in the system. The PCM grounds the control circuit to energize (close) the CCV.

DTC Description

Checking output signals from CCV every 10 sec. under detecting condition, if signals indicating open or short to ground in the circuit are detected for more than 5 sec., PCM sets P0447. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram