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Home › Mazda › 2002 › B4000 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0457: EVAP System Malfunction › Diagnostic Procedures

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. Check For Missing Or Leaking Fuel Filler Cap

    Check for missing or loose fuel filler cap. Check fuel filler cap for cross threading. If a problem is found, repair or replace component as necessary. Go to next step. If a problem is not found, go to step  4 .

  3. EVAP System Leak Test

    Perform EVAP System Leak Test. If EVAP System Leak Test is okay, go to step  5 . If EVAP System Leak Test is not okay, leakage is still present. Go to DTC P0455  .

  4. Drive Cycle

    Reconnect all connectors. Using scan tool, clear DTC 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. Go to next step.

  5. Verify Trouble Shooting Of DTCs Completed

    Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. 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. Advise customer to properly tighten fuel filler cap after refueling.
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