DTC P0441: EVAP Purge Flow Monitor Failure: Testing
- Using scan tool, retrieve DTCs. If GLOBAL GOOD TRIP displayed is zero, go to step 3
. If GLOBAL GOOD TRIP is not zero, go to next step.
- At this time the 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. Attempt to duplicate the condition that causes DTC to be set. While using FREEZE FRAME data, pay attention to the conditions such as vehicle speed, engine coolant temperature, load and MAP sensor vacuum. If EVAP purge flow monitor failure reoccurs, go to next step. If EVAP purge flow monitor failure does not reoccur, failure is no longer present.
- Inspect vacuum hoses from engine to EVAP purge solenoid, to fuel tank for proper routing, pinched or plugged hoses. If vacuum hoses are okay, go to next step. If vacuum hoses are not okay, repair or replace as necessary.
- Remove EVAP purge solenoid from vehicle. EVAP purge solenoid is located at right front corner of engine compartment. See Fig 1
. Tap EVAP purge solenoid against a clean solid surface. If any foreign material falls out, ensure all material is removed and go to next step. If no foreign material falls out, replace EVAP purge solenoid.
- Inspect line from EVAP purge solenoid to EVAP canister for damage. If line is okay, clean line out and replace EVAP purge solenoid and EVAP canister. If line is not okay, repair as necessary and replace EVAP purge solenoid.
Courtesy of DAIMLERCHRYSLER CORPORATION