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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0455 Or DTC P1443 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed and DTC P0455 is present, go to next step. If DTC P1443 is present, go to step  3.
  2. Visually Check For Large EVAP System Leak -  Check for presence of fuel filler cap. DO NOT tighten or check for correct installation at this time. Verify that both input port vacuum hose and EVAP return tube are attached to EVAP Canister Purge Valve (EVAPCPV). Verify Canister Vent (CV) solenoid is properly attached to EVAP canister. Visually inspect for disconnected or cracked fuel vapor hoses/tubes between intake manifold and following components:
    • EVAPCPV.
    • EVAP canister.
    • Fuel vapor vent valve assembly.

    Check for damage to fuel filler pipe and fuel tank. If no fault is visually evident, go to next step. If a fault is visually evident, repair or replace EVAP component(s) as necessary. After repair, go to step  7.

  3. Check For EVAP System Leaks -  Disconnect EVAP return tube from intake manifold and plug EVAP return tube. Connect EVAP System Leak Tester to EVAP test port. Perform EVAP System Leak Test. Refer to EVAPORATIVE EMISSIONS SYSTEM LEAK TEST under FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - B2300, B3000, B4000 & TRIBUTE article. If pressure reading stays at more than 8 in. H2O (1.99 kPa), go to next step. If pressure reading is not as specified, verify fuel filler cap is installed correctly. Repair or replace EVAP components as necessary. After repair, go to step  7.
  4. Check For Blockage Between EVAP Canister Purge Valve & Fuel Vapor Tee -  Turn ignition on, engine off. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select ACTIVE COMMAND MODES. Select OUTPUT TEST MODE. Close EVAP CV solenoid using EVAPCV PID. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Press STOP (#4) on scan tool to open EVAP CV solenoid. If pressure drops immediately, go to next step. If pressure does not drop immediately, replace vapor line between EVAPCPV and fuel vapor tee. After repair, go to step  8.
  5. Check For Blockage Between Fuel Filler Pipe & Fuel Vapor Tee -  Connect the EVAP System Leak Tester to the fuel filler pipe. Close EVAP Canister Vent (EVAPCV) solenoid using EVAPCV PID from OUTPUT TEST MODE. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Press STOP (#4) to open EVAP CV solenoid. If pressure drops immediately, go to next step. If pressure does not drop immediately, replace fuel tank vapor line(s). Repeat this step to verify repair. After repair, go to step  8.
  6. Check For Failed EVAP Canister Purge Valve Or Fuel Tank Pressure Sensor -  If both P0455 and P1443 present at step  1, replace EVAPCPV. After repair, go to next step. If both P0455 and P1443 were not present at step 1), replace FTP sensor. After repair, go to next step.
  7. EVAP System Leak Test -  Connect all disconnected connectors and hoses. Perform EVAP system leak test. Refer to EVAPORATIVE EMISSIONS SYSTEM LEAK TEST under FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - B2300, B3000, B4000 & TRIBUTE article. If test result is okay, go to step  9. If test result is not okay, large leak still exists. Locate leak point and repair. After repair, repeat this step.
  8. Drive Cycle -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool generic OBD-II function. Perform EVAP System Monitor Drive Cycle. Refer to EVAP RUNNING LOSS SYSTEM REPAIR VERIFICATION DRIVE CYCLE  under MONITOR REPAIR VERIFICATION DRIVE CYCLES. Retrieve pending code. If same DTC is present, replace PCM. After repair, go to next step. If same DTC is not present, go to next step.
  9. Verify Trouble Shooting Of DTCs Completed -  Perform PCM Quick Test. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.
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