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 GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8 .
- Turn ignition off. Disconnect vacuum hoses from EVAP purge solenoid. See Fig 1 . Inspect hoses and EVAP purge solenoid for any signs of contamination from EVAP canister, which may indicate a faulty rollover valve. If rollover valve is faulty, replace fuel tank. If no signs of contamination are present, apply 10 in. Hg of vacuum to EVAP purge solenoid vacuum port with a hand vacuum pump. If EVAP purge solenoid holds vacuum, go to next step. If EVAP purge solenoid does not hold vacuum, replace EVAP purge solenoid.
- With 10 in. Hg of vacuum still applied, turn ignition on and observe vacuum gauge. Using scan tool, actuate EVAP purge solenoid. If vacuum drops when EVAP purge solenoid is actuated, go to next step. If vacuum does not drop when EVAP purge solenoid is actuated, replace EVAP purge solenoid.
- Turn ignition off. Carefully inspect EVAP purge solenoid vacuum supply hose for proper routing. See VACUUM DIAGRAMS article. Check for blockage or kink in vacuum supply hose. Also, check vacuum port on throttle body for blockage. If no problems are found, go to next step. If any problems are found, repair as necessary.
- Visually inspect EVAP purge hose between EVAP purge solenoid and EVAP canister for physical damage. See Fig 2 . If no problems are found, go to next step. If any problems are found, repair or replace hose as necessary.
- Visually inspect EVAP purge hose between EVAP canister and fuel tank for physical damage. If no problems are found, go to next step. If any problems are found, repair or replace hose as necessary.
- Visually inspect EVAP canister for physical damage or evidence of fuel entering EVAP canister. If fuel has entered EVAP canister, it may indicate a defective rollover valve. If no problems are found, go to next step. If any problems are found, repair as necessary.
- Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
- Wiggle EVAP purge solenoid wiring while circuit is actuated with scan tool. See Fig 1 . Listen for solenoid to stop actuating. Also, watch GOOD TRIP counter to change to zero. If solenoid stops actuating or GOOD TRIP counter changes to zero, repair wiring or connectors where wiggling caused solenoid to stop actuating or GOOD TRIP counter to change.
- Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
- Refer to any technical service bulletins that may apply.
- Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
- Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.
If a problem is found, repair as necessary. If no problems are found, test is complete.