General Information

P0446 Evaporative Emission System Vent Control Circuit

General Information

Component Location





General Description

The evaporative emissions 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.

DTC Description

Following a negative pressure test, the PCM opens the CCV. At that time, fuel tank pressure is monitored to ambient pressure. If the fuel tank pressure does not return to ambient pressure, P0446 is set.

DTC Detecting Condition





Specification





Schematic Diagram





Signal Waveform