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Home >> Jeep >> 2002 >> Wrangler X, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0441: EVAP Purge Flow Monitor Failure >> Testing

DTC P0441: EVAP Purge Flow Monitor Failure: Testing

  1. Turn ignition on, engine not running. 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. Visually inspect the EVAP canister. Look for any physical damage or any signs of fuel that has entered the canister. Any signs of fuel may indicate a bad rollover valve. Rollover valve is located on top of fuel tank. Were any problems found? If yes, repair or replace as necessary. If no, go to next step.
  3. Visually inspect the EVAP purge hose that goes from the 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.
  4. Visually inspect the EVAP purge hose that goes between the EVAP canister and the fuel tank. 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.
  5. Carefully inspect the EVAP Purge Solenoid vacuum supply hose for proper routing. Also check for a pinched or plugged hose from the throttle body to the Purge Solenoid. Inspect the vacuum nipple at the throttle body for any damage or plugging. Is the vacuum supply hose and throttle body vacuum nipple free from defects? If yes, go to next step. If no, repair the vacuum supply hose/tube as necessary.
    6. 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 purge solenoid if contamination is found.
  6. 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 (component side). Does the EVAP Purge Solenoid hold vacuum? If yes, go to next step. If no, replace the EVAP Purge Solenoid.
  7. Using a hand vacuum pump, apply 10 in. Hg of vacuum to the EVAP Purge Solenoid vacuum source port (component side). Turn ignition on, engine not running. With the DRBIII®, actuate the EVAP Purge Solenoid and observe the vacuum gauge. Does the vacuum drop when the solenoid is actuated? If yes, go to next step. If no, replace the EVAP Purge Solenoid.
    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. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. 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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