DTC P0441: EVAP Purge Flow Monitor: Testing
NOTE:
Proportional purge solenoid may also be referred to as EVAP purge solenoid.
- Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to step 8. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", go to next step.
- Visually inspect EVAP canister. Evaporative canister is located on top of fuel tank. See Fig 1. It may be necessary to lower or remove fuel tank to access EVAP canister. Check EVAP canister for damage or any signs of fuel inside of canister. If any fuel is present, fuel tank rollover valve may be defective. Replace fuel tank as necessary. If EVAP canister is okay, go to next step.
- Visually inspect EVAP purge hose between EVAP canister and fuel tank. Check for pinched, plugged, ripped or dry rotted hose. Replace hose as necessary. If hose is okay, go to next step.
- Visually inspect EVAP purge hose between EVAP canister and EVAP purge solenoid. EVAP purge solenoid is located at right front corner of engine compartment, near air cleaner. See Fig 2. Check for pinched, plugged, ripped or dry rotted hose. Replace hose as necessary. If hose is okay, go to next step.
- Ensure vacuum supply hose to EVAP solenoid valve is routed properly. For vacuum hose routing, see appropriate VACUUM DIAGRAMS article. Also check for pinched or plugged vacuum supply hose. Check for plugged vacuum fitting at throttle body. Repair vacuum fitting as necessary. If no problems are found, go to next step.
- Disconnect vacuum hoses from EVAP purge solenoid. Using hand-held vacuum pump, apply 10 in. Hg to vacuum source port at EVAP purge solenoid. If vacuum holds, go to next step. If vacuum does not hold, replace EVAP purge solenoid.
- Ensure 10 in. Hg is still present at EVAP purge solenoid. Using scan tool, actuate EVAP purge solenoid and observe vacuum gauge. If vacuum releases, no problem is indicated at this time. Test is complete. If vacuum does not release, replace EVAP purge solenoid.
- At this time, conditions for EVAP purge flow monitor failure do not exist or fault is an intermittent problem. Using scan tool, read FREEZE FRAME data while attempting to duplicate the conditions that caused DTC to be set. Visually check EVAP purge solenoid and vacuum hoses. Check for damaged, pinched or partially broken vacuum hoses. For vacuum hose routing, see appropriate VACUUM DIAGRAMS article. Repair vacuum hoses as necessary. If no problems are found, test is complete.