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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> On-Board Diagnostic [Engine Control System MZR 2.5] (3 Of 5) >> DTC P0442:00, P0455:00, P0456:00 >> Notes

DTC P0442:00, P0455:00, P0456:00: Notes

DTC P0442:00 EVAP system leak detected (small leak)
DTC P0455:00 EVAP system leak detected (gross leak/no flow)
DTC P0456:00 EVAP system leak detected (very small leak)
DETECTION CONDITION  P0442:00 
  • P0442:00 indicates that a leak has been detected as small as 1 mm {0.04 in}  in the EVAP vapor management valve solenoid system when there is less than 0.988 kPa {7.41 mmHg, 0.292 inHg}  bleed-up over 20 s  at 75 %  fuel fill. Bleed-up and evaluation time vary as a function of fuel fill level. The vapor generation limit is more than 0.286 kPa {2.15 mmHg, 0.085 inHg} over 150 s  .

    P0455:00 

  • P0455:00 indicates that a substantial leak or blockage has been detected in the EVAP system when there is -1.94 kPa {-14.6 mmHg, -0.575 inHg} or less  vacuum for 50 s  evaluation time.

    P0456:00 

  • P0456:00 indicates that a fuel vapor leak from an opening as small as 0.508 mm {0.020 in}  has been detected by the EVAP running loss monitor test.

    Diagnostic support note 

  • This is an intermittent monitor (EVAP system).
  • The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
  • PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
  • The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION  -
POSSIBLE CAUSE  DTC P0442:00, P0456:00 
  • After-market EVAP hardware (such as fuel filler cap) nonconforming to required specifications
  • Fuel filler cap loosely installed
  • Small leaks in components
    • CV solenoid is not seated on the charcoal canister
    • Cut or loose connection in the fuel vapor hoses/tubes
    • Fuel filler pipe damaged
  • Fuel filler cap and fuel filler pipe damaged
  • CV solenoid valve malfunction
  • Leaks in complete EVAP system
  • Small leaks from EVAP system return tube to charcoal canister
  • Small leaks between fuel tank vapor tube and fuel tank filler pipe
  • Fuel tank pressure sensor malfunction
  • PCM malfunction

    DTC P0455:00 

  • Purge solenoid valve related part malfunction
    • Blockage or loose vacuum hose between intake manifold and purge solenoid valve
    • Purge solenoid valve malfunction (blockage)
  • After-market EVAP hardware (such as fuel filler cap) not conforming to required specifications
  • Large EVAP system leak
    • Fuel filler cap malfunction (damaged, missing or loosely installed)
    • Both the input port vacuum hose and EVAP return tube are not attached to the CV solenoid valve
    • CV solenoid valve is not attached to the charcoal canister
    • Fuel vapor hoses/tubes disconnected or cracked
    • Fuel filler pipe and fuel tank damaged
  • Blockage between CV solenoid valve and fuel vapor hose joint
  • CV solenoid valve malfunction
  • Fuel tank pressure sensor malfunction
  • PCM malfunction
SYSTEM WIRING DIAGRAM  -