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Home >> Mazda >> 2003 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0441: EVAP System - Incorrect Purge Flow >> Diagnostic Procedures
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Diagnostic Procedures

  1. Record freeze frame data. Check for service bulletins and on-line information. Repair as necessary. After repair, go to next step.
  2. Verify Related Pending Code Or Stored DTCs -  Turn ignition on, engine off. Check for related DTCs. If no other DTCs are present, go to next step. If any other DTCs are present, diagnose and repair those DTCs first. Refer to DIAGNOSTIC TROUBLE CODE IDENTIFICATION .
  3. Determine If Leak Concern Or Blockage Concern -  Perform EVAP system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK TESTER under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If EVAP system test result passed (Green light on), go to next step. If EVAP system test result failed (Red light on), go to step  5.
  4. Inspect Purge Solenoid Valve Stuck Closed -  Check if purge solenoid valve is stuck closed. See FUEL EVAPORATIVE SYSTEM (MPV) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If purge solenoid valve is okay, ensure vacuum hoses between intake manifold and charcoal canister, catch tank or charcoal canister are not plugged. Repair or replace as necessary. After repair, go to step  10. If purge solenoid valve is not okay, replace purge solenoid valve. After repair, go to step  10.
  5. Locate Leak Point -  Using ultrasonic leak detector, check following:
    • Charcoal canister.
    • Catch tank.
    • Fuel filler cap.
    • EVAP hoses and pipes.
    • Fuel tank.

    If leak is not detected, go to next step. If leak is detected, repair or replace as necessary. After repair, go to step  10.

  6. Inspect EVAP System Leak Detection Pump -  Connect all disconnected connectors and hoses. Install clamp on EVAP system leak detection pump hose between EVAP system leak detection pump and air filter. Perform EVAP system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK TESTER under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result passed (Green light on), go to next step. If test result failed (Red light on), go to step  8.
  7. Confirm EVAP System Leak Detection Pump Leakage -  Remove clamp from EVAP system. Perform EVAP system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK TESTER under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result passed (Green light on), go to next step. If test result failed, replace EVAP system leak detection pump. After repair, go to step  9.
  8. Inspect Fuel Pump Unit Installation -  Remove fuel tank. Check for damage, insufficient sealing or incorrectly installed fuel pump unit. If no problems are found, go to next step. If problem is found, repair or replace fuel tank or repair sealing. After repair, go to next step.
  9. Perform Leak Inspection -  Connect all disconnected connectors and hoses. Perform EVAP system leak inspection. See EVAPORATIVE SYSTEM LEAK INSPECTION USING LEAK TESTER under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result failed (Red light on), leakage is still present. Locate leak and repair. After repair, go to next step. If test result passed (Green light on), go to next step.
  10. Verify Trouble Shooting Of DTC P0441 Completed -  Start engine and allow to idle. Using scan tool, clear DTC. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off. Perform MODE 6 - EVAP SYSTEM REPAIR VERIFICATION DRIVE MODE  under DRIVE MODES. Check DTCs. If DTC P0441 is present, replace PCM. After repair, go to next step. If DTC P0441 is not present, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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