DTC P0441-A: EVAP Purge Flow Monitor Failure

NOTE: Proportional purge solenoid is located next to air filter housing. Evaporative canister and Leak Detection Pump (LDP) are located next to fuel tank.

Using scan tool, read Diagnostic Trouble Codes (DTCs). If scan tool display GLOBAL GOOD TRIP is equal to zero, go to step 4. If scan tool display GLOBAL GOOD TRIP is not equal to zero, go to next step.
Using scan tool, read FREEZE FRAME data. Ensure hex code matches DTC on scan tool. Hex code should be 71. If DTC matches hex code on scan tool, go to next step. If DTC does not match hex code on scan tool, repair DTC using FREEZE FRAME data. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
Read FREEZE FRAME data on scan tool. Try to duplicate conditions identified on scan tool. Pay particular attention to code set conditions: engine RPM, coolant temperature and engine load. Using scan tool, observe GLOBAL GOOD TRIP counter. If GLOBAL GOOD TRIP counter changed to zero, operate vehicle for one good trip, then erase DTCs. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If GLOBAL GOOD TRIP counter does not change to zero, go to next step.
Replacing Powertrain Control Module (PCM) will not correct this trouble code. Inspect vacuum hoses from engine, to proportional purge solenoid, to gas tank for proper routing and for damage. If vacuum hoses are okay, go to next step. If vacuum hoses are not okay, repair as necessary. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
Start engine. Allow engine to reach normal operating temperature. Turn engine off. Disconnect proportional purge vacuum hose at proportional purge solenoid that goes to canister. Start engine. There should be no flow though proportional purge solenoid for 10 seconds to 3 minutes. If proportional purge solenoid does not allow vacuum through within one minute, go to next step. If proportional purge solenoid allows vacuum through within one minute, go to DTC P0441-C: EVAP PURGE FLOW MONITOR FAILURE .
After 90 seconds, proportional purge solenoid will allow vacuum to cycle intermittently at a steady rate. If proportional purge solenoid is allowing vacuum to cycle through intermittently at a steady rate, go to DTC P0441-B: EVAP PURGE FLOW MONITOR FAILURE . If proportional purge solenoid is not allowing vacuum to cycle through intermittently at a steady rate, go to next step.
Disconnect vacuum hose from proportional purge solenoid to throttle body at proportional purge solenoid. Connect a vacuum gauge to disconnected vacuum hose that goes to throttle body. If vacuum gauge indicates manifold vacuum, go to next step. If vacuum gauge does not indicate manifold vacuum, repair vacuum hose or throttle body. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
Reconnect vacuum hose from throttle body to proportional purge solenoid. Connect a vacuum gauge to canister side of proportional purge solenoid. If vacuum gauge indicates 3-7 in. Hg, go to next step. If vacuum gauge does not indicate 3-7 in. Hg, replace proportional purge solenoid. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
Connect a vacuum pump to hose going to EVAP canister. Apply more than 2 in. Hg vacuum to canister. If canister holds more than 2 in. Hg vacuum, go to next step. If canister does not hold more than 2 in. Hg vacuum, replace proportional purge solenoid. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
Check for plugged hose or plugged vent port on canister. If hose is plugged, repair as necessary. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If hose is not plugged, go to next step.
If vent port is plugged, clean plugged vent port and retest. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If vent port is not plugged, replace EVAP canister. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .