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Home >> Mazda >> 2003 >> B2300 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1450: EVAP Monitor >> Diagnostic Procedures
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Diagnostic Procedures

  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
  2. DTC P1450: Check For Visual Causes Of Excessive Fuel Tank Vacuum -  Check for kinks or bends in fuel vapor hoses and tubes. Visually check EVAP canister inlet port, canister vent solenoid, EVAP dust separator or outlet hose for contamination or foreign material. If a problem is not found, go to next step. If a problem is found, remove any contamination or foreign material around fuel vapor hoses and tubes. Repair hoses, tubes or components as necessary. After repair, go to step  7 .
  3. Perform EVAP Leak Test -  Connect EVAP System Leak Tester to fuel filler pipe. Using scan tool, with KOEO, select DIAGNOSTIC DATA LINK. Select PCM. Select ACTIVE COMMAND MODES. Close EVAP CV solenoid by accessing OUTPUT TEST MODE. Pressurize EVAP system to 14 in. H2O (3.48 kPa). If pressure reaches 14 in. H2O (3.48 kPa), go to next step. If pressure does not reach 14 in. H2O (3.48 kPa), check if EVAP canister purge valve is stuck open. Replace if necessary. After repair, go to step  7 .
  4. Check For Canister Vent Solenoid Stuck Closed -  Press STOP (#4) to open EVAP CV solenoid. If pressure drops immediately, go to next step. If pressure does not drop immediately, see HISSING SOUND WHEN REMOVING FUEL CAP under SYSTEM TESTS (EVAPORATIVE EMISSION) in SYSTEM & COMPONENT TESTING - B2300, B3000, B4000 & TRIBUTE article.
  5. Check For Fuel Tank Pressure Sensor PID Without Pressure Applied -  Disconnect EVAP canister outlet tube at EVAP canister. With KOEO, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access and record FTP V PID. If voltage reading is 2.4-2.8 volts, go to next step. If voltage reading is not 2.4-2.8 volts, replace faulty Fuel Tank Pressure (FTP) sensor. After repair, go to next step.
  6. EVAP System Leak Test -  Connect all disconnected connectors and hoses. Perform EVAP system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST under SYSTEM TESTS (EVAPORATIVE EMISSION) in SYSTEM & COMPONENT TESTING - B2300, B3000, B4000 & TRIBUTE article. If test result is okay, go to step  8 . If test result is not okay, leakage is still present. Locate and repair leak point. After repair, repeat this test step.
  7. Drive Cycle -  Reconnect all connectors. Using scan tool, clear DTC from PCM memory. Perform EVAP RUNNING LOSS SYSTEM REPAIR VERIFICATION DRIVE CYCLE  in MONITOR REPAIR VERIFICATION DRIVE CYCLES under DRIVE CYCLE PROCEDURES. Using scan tool, retrieve DTCs. If same DTC is not present, go to next step. If same DTC is present, replace faulty PCM. After repair, go to next step.
  8. Verify Trouble Shooting Of DTCs Completed -  Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any DTC is present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM. If no DTC is present, trouble shooting is complete.
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