DTC P0441: Evaporative Emission Control System Incorrect Purge Flow

TECHNICAL DESCRIPTION
• PCM 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
Fuel tank pressure decreases largely during purge-cut.
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 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 Criteria
• The pressure in the fuel tank is -2 kPa (-0.59 in.Hg) or less.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 1 - Evaporative Emission System Leak Monitor .
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.
• Fuel tank differential pressure sensor circuit related part(s) failed.