DTC P1442: EVAP Control System: Description

This diagnosis detects leaks in the EVAP purge line using vapor pressure in the fuel tank. The EVAP Canister Vent Control Valve (EVAP-CVCV) is closed to shut the EVAP purge line. The vacuum cut valve bypass valve will then be opened to clear the line between the fuel tank and the EVAP Canister Purge Volume Control Solenoid Valve (EVAP-CPVCSV). The EVAP Control System Pressure Sensor (EVAP-CSPS) can now monitor the pressure inside the fuel tank. If pressure increases, the ECM will check for leaks in the line between the vacuum cut valve and EVAP-CPVCSV.