Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSNISSAN-DATSUN2003FRONTIER BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0442: EVAP CONTROL SYSTEM - SMALL LEAK DETECTEDPOSSIBLE CAUSES
2003 Nissan-Datsun Frontier Base, Standard
Possible Causes
2003 Nissan-Datsun Frontier Base, StandardSECTION Possible Causes
Malfunction is detected when EVAP control system has a small leak or does not operate properly. Possible causes are:
- Incorrect fuel tank vacuum relief valve.
- Incorrect fuel filler cap.
- Fuel filler cap remains open or fails to close.
- Foreign matter in fuel filler cap.
- Leak in hose between intake manifold and EVAP-CPVCSV.
- Foreign matter in EVAP-CVCV.
- Leak in EVAP canister or fuel tank.
- Leak or blockage in EVAP purge line.
- Leak or blockage in hose to EVAP Control System Pressure Sensor (EVAP-CSPS).
- Defective EVAP-CVCV or circuit.
- Defective EVAP-CPVCSV or circuit.
- Defective fuel tank temperature sensor.
- Missing or damaged EVAP-CVCV "O" ring.
- Defective EVAP-CSPS.
- Defective fuel level sensor or circuit.
- EVAP canister saturated with water.
- Defective water separator.
- Defective refueling control valve.
- Leak in On-Board Refueling Vapor Recovery (ORVR) system.
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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.