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DTC P0441: EVAP Purge Flow Monitor: Testing

  1. Turn the ignition on. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  8.
    2. NOTE: After disconnecting the EVAP Purge Solenoid vacuum connections, inspect the lines and solenoid for any signs of contamination from the EVAP Canister. This may indicate a faulty rollover valve. Replace/repair as necessary. Rollover valve is located in top of fuel tank.
  2. Turn the ignition off. Disconnect the vacuum hoses at the EVAP Purge Solenoid. Using a hand vacuum pump, apply 10 in. Hg of vacuum to the EVAP Purge Solenoid vacuum source port on the component side. Does the EVAP Purge Solenoid hold vacuum? If yes, go to next step. If no, replace the EVAP Purge Solenoid.
  3. Using a hand vacuum pump, apply 10 in. Hg of vacuum to the EVAP Purge Solenoid vacuum source port on the component side. Turn the ignition on. Observe the vacuum gauge. With the DRBIII®, actuate the EVAP Purge Solenoid. Does the vacuum drop when the solenoid is actuated? If yes, go to next step. If no, replace the EVAP Purge Solenoid.
  4. Turn the ignition off. Carefully inspect the EVAP Purge Solenoid vacuum supply hose for proper routing. Check for a pinched or plugged hose from the throttle body to the Purge Solenoid. Inspect the vacuum port at the throttle body for any damage or plugging. Were any problems found? If yes, repair the vacuum supply hose/tube as necessary. If no, go to next step.
  5. Visually inspect the EVAP Purge hose from the EVAP Purge Solenoid to the EVAP Canister. Look for any physical damage such as a pinched, plugged, ripped or dry rotted hose. Were any problems found? If yes, repair or replace hose as necessary. If no, go to next step.
  6. Visually inspect the EVAP Purge hose from between the EVAP Canister and the Fuel Tank. Check for any physical damage such as a pinched, plugged, ripped or dry rotted hose. Were any problems found? If yes, repair or replace hose as necessary. If no, go to next step.
  7. Visually inspect the EVAP Canister for any physical damage or signs of fuel that has entered the canister. Fuel inside EVAP Canister may indicate a bad rollover valve. Were any problems found? If yes, repair or replace as necessary. If no, test is complete.
    8. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  8. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. Perform a wiggle test of the EVAP Purge Solenoid wiring while the circuit is actuated with the DRBIII®. Listen for the solenoid to quit actuating. Also watch for the Good Trip counter to change to zero. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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