Purge Valve Leak Test

The control module monitors the fuel tank pressure sensor signal during a cold start in order to test the EVAP purge valve. With the purge valve OFF or closed, the PCM expects to detect no vacuum in the system. If the control module detects a vacuum while the Purge Valve Leak Test is being performed, a DTC P1441 is set.

The evaporative system canister, filled with activated carbon pellets, stores the fuel vapors from the fuel tank. The engine vacuum purges the vapor canister during normal driving.