DTC P0441: Evaporative Emission Control System Incorrect Purge Flow

TECHNICAL DESCRIPTION
• ECM <M/T> or PCM <A/T> detects stuck open of evaporative emission purge solenoid valve and stuck close of evaporative emission ventilation solenoid valve by pressure change in fuel tank.
• Stuck open of evaporative emission purge solenoid valve is judged through monitoring leak of evaporative emission system.
• Stuck close of evaporative emission ventilation solenoid valve is judged after 20 seconds of end of monitoring leak of evaporative emission system, or of usual operation of evaporative emission purge solenoid from ON to OFF.
DESCRIPTIONS OF MONITOR METHODS
• If the internal pressure of the fuel tank has dropped significantly while the evaporative emission purge is being cut, a malfunction is determined to have occurred (EVAP purge solenoid stuck open or EVAP ventilation solenoid stuck closed).
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Fuel tank differential pressure sensor monitor

Sensor (The sensor below is determined to be normal)
• Not applicable
DTC SET CONDITIONS Logic Flow Chart


Check Conditions
ON duty cycle of the evaporative emission purge solenoid is 0 percent.
20 seconds have elapsed from the time the duty cycle of the evaporative emission purge solenoid has turned to 0 percent.

Judgment Criterion
• The pressure in the fuel tank is -2 kPa (-0.6 in.Hg) or less for 0.1 second.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 5 .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:
• Evaporative emission purge solenoid failed.
• Evaporative emission ventilation solenoid failed.
• Choking up of hose between evaporative emission canister and evaporative emission ventilation solenoid.