2006 Mazda MX-5 Miata BaseFACTORY OEM SERVICE PROCEDURE

DTC P0442: Notes

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0442)

DTC P0442 Evaporative emission control system leak detected (small leak)
DETECTION CONDITION 
  • PCM measures the pump load current (EVAP line pressure) when the specified period has passed after EVAP system is sealed when monitoring conditions are met. If the load does not reach the reference current value within the specified period, PCM determines that the EVAP system has small leak.

    Monitoring condition 

    • The ignition switch is turned off.
    • IAT: 4.4-35°C {40-95°F} 
    • Battery voltage: 11 V or above 
    • Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above 
    • Fuel tank level: 15-85% 
    • Time from engine off: 5 h 10 min. 
Diagnostic support note 
  • This is an intermittent monitor (Evaporative system).
  • The MIL illuminates if the PCM detects 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 the first drive cycle.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the PCM memory.
  • DIAGNOSTIC MONITORING TEST RESULT is available.
POSSIBLE CAUSE 
  • Purge solenoid valve malfunction
  • EVAP system leak detection pump malfunction
  • Charcoal canister malfunction
  • Fuel filler cap malfunction
  • Fuel tank malfunction
  • Fuel pump unit poor seal
  • EVAP hose damaged or loose
  • EVAP pipe damaged
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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