General Information

General Description

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 ECM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustion. This valve is actuated by the purge control signal from the ECM and controls fuel vapor flow from the canister to the intake manifold.

DTC Description

During the vapor generation test, the fuel tank pressure sensor value is compared to the value present at the start of the test.
The ECM sets DTC P0441 if the pressure signal decrease occurs and the difference is below the predetermined threshold.
If the fault is detected within two consecutive test cycles, the ECM illuminates the MIL.

DTC Detecting Condition