[Previous][Next]
DTC P0441: Evaporative Emission Control System Incorrect Purge Flow
 
 
 
 
TECHNICAL DESCRIPTION
  • While the engine is running, close the switching valve in the evaporative leak check module, and detect the purge function failure from the pressure change in the evaporative emission canister when the purge is forcibly introduced by opening the evaporative emission purge solenoid.
 
 
MONITOR EXECUTION
  • Once per driving cycle.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Barometric pressure sensor monitor
  • Barometric pressure sensor/Manifold absolute pressure correlation
  • Evaporative emission purge solenoid monitor
  • Bypass valve monitor
  • Fuel tank solenoid valve monitor
  • Bypass valve/Fuel tank solenoid valve monitor
  • Switching valve monitor
  • Canister pressure sensor monitor
  • Fuel tank pressure sensor monitor
Sensor (The sensor below is determined to be normal)
  • Mass airflow sensor
  • Engine coolant temperature sensor
  • Intake air temperature sensor
  • Barometric pressure sensor
  • Throttle position sensor
  • Manifold absolute pressure sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • Engine coolant temperature is higher than 20°C (68°F).
  • Intake air temperature is higher than 5°C (41°F) and lower than 55°C (131°F).
  • Mass airflow sensor output is 10 g/sec or more.
  • The ratio between the manifold absolute pressure and the barometric pressure is less than 0.96.
  • The closed loop air-fuel control continues for 20 seconds or more.
  • 12V starter battery positive voltage is 11 volts or higher.
  • Engine is running.
  • Bypass valve is not driving.
  • More than 1 second has elapsed after the above mentioned conditions have been met.
  • While engine is running, following condition is not even met once: intake air temperature is 5°C (41°F) or lower, or 55°C (131°F) or higher.
Judgment Criterion
  • For 5 seconds, the canister pressure subtracted from the barometric pressure is less than 0.27 kPa (0.080 in.Hg) with the evaporative emission purge solenoid driving.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Indicates "REFUELING SYSTEM SERVICE REQUIRED" on the information screen in the multi-information display.
 
 
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 canister is clogged.
  • Purge line seal failed.
  • Purge line is clogged.
  • Evaporative emission purge solenoid stuck closed.
  • Bypass valve stuck closed.
  • Fuel tank solenoid valve stuck open.
  • Switching valve stuck open.
  • Canister pressure sensor is stuck.
  • Evaporative emission purge solenoid harness damage, or connector damage.
  • Evaporative leak check module circuit harness damage, or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
STEP 1. Check the evaporative emission purge solenoid for clogs.
Refer to GROUP 17, Emission Control - Evaporative Emission Control System - evaporative emission purge solenoid Check .
Is there ventilation of the evaporative emission purge solenoid?
Go to Step 2.
Replace the evaporative emission purge solenoid. Then go to Step 14.
 
STEP 2. Check the installation state of the vacuum hose and pipe between the evaporative emission purge solenoid and fuel tank solenoid valve.
Do the hoses and pipes connect correctly?
Go to Step 3.
Repair it. Then go to Step 14.
 
STEP 3. Check piping clogging between the evaporative emission purge solenoid and bypass valve.
(1) Disconnect the shown pipe in the bypass valve.
(2) Disconnect the shown hose from evaporative emission purge solenoid and mount the hand vacuum pump on the hose side.
  • When negative pressure is applied with the hand vacuum pump, check that there is ventilation and no clogging.
Are the hoses and pipes in good condition?
Go to Step 4.
Repair the hose(s) or pipe(s). Then go to Step 14.
 
STEP 4. Check for leaks in evaporative emission hose A, chamber and hose B.
Use a hand vacuum pump to check hose A, chamber and hose B.
Do the hoses and chamber hold vacuum?
Go to Step 5.
Replace any damaged hose. Then go to Step 14.
 
STEP 5. Check for leaks in evaporative emission hose C.
Use a hand vacuum pump to check hose C.
Does hose C hold vacuum?
Go to Step 6.
Replace any damaged hose. Then go to Step 14.
 
STEP 6. Check for leaks in evaporative emission hose D.
Use a hand vacuum pump to check hose D.
Does hose D hold vacuum?
Go to Step 7.
Replace any damaged hose. Then go to Step 14.
 
STEP 7. Check for leaks in evaporative emission hose E.
Use a hand vacuum pump to check hose E.
Does hose E hold vacuum?
Go to Step 8.
Replace any damaged hose. Then go to Step 14.
 
STEP 8. Check the fuel tank solenoid valve for stuck open.
Refer to GROUP 17, Emission Control - Evaporative Emission Control System - Fuel Tank Solenoid Valve Check .
Does the fuel tank solenoid valve hold pressure?
Go to Step 9.
Replace the fuel tank solenoid valve. Then go to Step 14.
 
STEP 9. Check of harness damage in PURG line between evaporative emission purge solenoid connector and ECM connector.
Is the harness wire in good condition?
Go to Step 10.
Repair the connector(s) or wiring harness. Then go to Step 14.
 
STEP 10. Check of harness damage in power supply line between MFI relay connector and evaporative emission purge solenoid connector.
Is the harness wire in good condition?
Go to Step 11.
Repair the connector(s) or wiring harness. Then go to Step 14.
 
STEP 11. Check of harness damage in COVB line between MFI relay connector and evaporative leak check module connector.
Is the harness wire in good condition?
Go to Step 12.
Repair the connector(s) or wiring harness. Then go to Step 14.
 
STEP 12. Check of harness damage in ECOV, EVSE, EVS and EVSS line between evaporative leak check module connector and ECM connector.
Is the harness wire in good condition?
Go to Step 13.
Repair the connector(s) or wiring harness. Then go to Step 14.
 
STEP 13. Replace the evaporative emission canister.
(1) Replace the evaporative emission canister.
(2) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
(3) Check the diagnostic trouble code (DTC).
Is DTC P0441 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 14.
The inspection is complete.
 
STEP 14. 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.