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Home >> Plymouth >> 2000 >> Neon Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self Diagnostics >> Diagnostic Tests >> DTC P0441: EVAP Purge Flow Monitor
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DTC P0441: EVAP Purge Flow Monitor

NOTE: EVAP purge flow monitor is monitored when engine coolant temperature is more than 170°F (717°C), engine is in closed loop, engine has been idling for 2 minutes, no low fuel condition exists, MAP sensor vacuum is less than 15.7 in. Hg and altitude is less than 8000 feet. DTC may be stored in Powertrain Control Module (PCM) if no airflow through EVAP system is detected by EVAP monitor after having passed leak detection pump test. Possible causes are: defective or restricted EVAP system hoses or lines, defective EVAP purge solenoid, defective EVAP canister. EVAP purge solenoid may also be referred to as proportional purge solenoid.
  1. Turn ignition on with engine off. Using scan tool, check for DTCs. If global good trip counter is not displayed and equal to zero, go to next step. If global good trip counter is displayed and equal to zero, go to step  8.
  2. Turn ignition off. Inspect EVAP purge solenoid vacuum hose for proper routing, pinching or plugging between throttle body and EVAP purge solenoid. EVAP purge solenoid is located below driver's side strut tower near steering gear. Check vacuum port at throttle body for damage or restrictions. If all hoses are okay, go to next step. If any hoses are improperly routed or restricted, repair as necessary. Perform TEST VER-5A .
  3. Disconnect EVAP purge solenoid vacuum hose at solenoid. Using hand pump, apply 10 in. Hg to EVAP purge solenoid. If valve holds vacuum, go to next step. If valve does not hold vacuum, replace EVAP purge solenoid. Perform TEST VER-5A .
  4. Inspect vacuum line for proper routing, pinching or plugging between EVAP purge solenoid and EVAP canister. EVAP canister is located by left rear wheel in front of fuel tank. If any problems are found, repair as necessary. Perform TEST VER-5A . If no problems are found, go to next step.
  5. Inspect vacuum line from EVAP purge solenoid to EVAP canister. If vacuum line is disconnected, ripped or cut, repair or replace vacuum line as necessary. Perform TEST VER-5A . If vacuum line is not disconnected, ripped or cut, go to next step.
  6. Inspect EVAP canister for physical damage and raw fuel entering canister. Raw fuel may indicate a bad rollover valve. If any problems are found, replace EVAP canister. Perform TEST VER-5A . If no problems are found, go to next step.
  7. Ensure all vacuum lines and hoses are reconnected. Disconnect EVAP purge solenoid vacuum hose at solenoid. Using hand pump, apply 10 in. Hg to EVAP purge solenoid. Using scan tool, actuate EVAP purge solenoid while monitoring hand pump pressure. If vacuum drops when solenoid is actuated, test is complete. If vacuum does not drop, replace EVAP purge solenoid. Perform TEST VER-5A .
  8. At this time, conditions for EVAP purge flow monitor failure does not exist or is an intermittent problem. Using scan tool, read FREEZE FRAME data and PURGE FLOW PRE-TEST data while attempting to duplicate the condition that caused DTC to be set. Inspect all vacuum hoses for proper routing and check vacuum hoses from engine to EVAP purge solenoid, and from EVAP purge solenoid to the fuel tank for restrictions. EVAP purge solenoid is located below driver's side strut tower near steering gear. EVAP canister is located by left rear wheel in front of fuel tank. Refer to Technical Service Bulletins (TSBs) for related problems. If any problems are found, repair as necessary. Perform TEST VER-5A . If no problems are found, test is complete.
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