Engine Controls - DTC P0441

SOURCE: Mitsubishi Tech Talk Article December 2004

TITLE: DIAGNOSING DTC P0441

APPLIES TO: ALL

SERVICE TIP:

Evaporative Emission Control System Incorrect Purge Flow

SYSTEM OPERATION

DTC P0441 sets when the negative fuel tank pressure is below -2.0 kPa (-0.6 inHg) during normal driving. During driving, fuel tank pressure is monitored continuously by the OBD-II system EVAP monitor as the PCM closes the purge and vent solenoids.
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The most likely reason for DTC P0441 to set during the EVAP monitor is due to a blockage or restriction on the vent side of the system (in a hose, vent valve, or frame where a hose vents). Since the fuel tank pressure sensor is continuously monitored, whenever the fuel tank pressure sensor reads below -2 kPa (-0 .6 inHg), DTC P0441 will set.