DTC Description

The ECM closes the Canister Close Valve (CCV) at the charcoal canister to seal off the evaporative emission system and then opens purge control valve (PCSV) to generate a vacuum in the fuel tank. After vacuum generation, the ECM measures pressure differential curve in the fuel tank and sets DTC P044200 or P045600 if the vacuum generated within a monitoring period increases above a defined threshold. If same error code is set in the next driving cycle, the ECM illuminates the MIL