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DTC P0441: Evaporative Emission Control System Incorrect Purge Flow
 
 
 
 
TECHNICAL DESCRIPTION
  • ECM detects a stuck open condition of evaporative emission purge solenoid and a stuck closed condition of evaporative emission ventilation solenoid by pressure change in fuel tank.
  • Stuck open evaporative emission purge solenoid is judged through monitoring leak of evaporative emission system.
  • Stuck closed evaporative emission ventilation solenoid is judged after 20 seconds from 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 set 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
  • Engine is running.
  • ON duty cycle of the evaporative emission purge solenoid is 0 percent.
  • 20 seconds have elapsed since the duty cycle of the evaporative emission purge solenoid has turned to 0 percent.
Judgment Criterion
  • The pressure in the fuel tank is -1.96 kPa (-0.58 in.Hg) or less for 0.1 second.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • None.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
  • Evaporative emission purge solenoid failed.
  • Evaporative emission ventilation solenoid failed.
  • Fuel tank differential pressure sensor circuit related part(s) failed.

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), read the diagnostic trouble code (DTC).
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC P0451 set?
Refer to DTC P0451 - Evaporative Emission Control System Pressure Sensor Range/Performance .
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check data list item 52: Fuel Tank Differential Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Remove the fuel cap.
(3) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 52, Fuel Tank Differential Pressure Sensor.
  • The fuel tank differential pressures should be 1,500 and 3,500 millivolts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the fuel tank pressure between 1,500 and 3,500 millivolts?
Go to Step 3.
Refer to DTC P0451 - Evaporative Emission Control System Pressure Sensor Range/Performance .
 
STEP 3. Using scan tool (M.U.T.-IIISE), check actuator test item 4: Evaporative Emission Purge Solenoid ON.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool (M.U.T.-IIISE) to the actuator test mode for item 4, Evaporative emission purge solenoid ON.
  • An operation sound should be heard and vibration should be felt when the evaporative emission purge solenoid is operated.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the solenoid operating properly?
Go to Step 4.
Replace the evaporative emission purge solenoid. Then go to Step 6.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check actuator test item 9: Evaporative Emission Ventilation Solenoid ON.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool (M.U.T.-IIISE) to the actuator test mode for item 9, Evaporative emission ventilation solenoid ON.
  • An operation sound should be heard and vibration should be felt when the evaporative emission ventilation solenoid is operated.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the solenoid operating properly?
Repair or replace the vent hose and air filter. Then go to Step 5.
Replace the evaporative emission ventilation solenoid. Then go to Step 6.
 
STEP 5. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0441 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 6.
The inspection is complete.
 
STEP 6. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
(2) Read the diagnostic trouble code.
Is DTC P0441 set?
Retry the troubleshooting.
The inspection is complete.