DTC P0440, P0455 Or P1440: EVAP Control System: Notes

NOTE: If DTC P1448 is also present, perform diagnosis for DTC P1448 first.

NOTE: Before performing diagnostic procedure, follow testing procedure. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM.

Malfunction is detected when EVAP system has a leak or does not operate properly. Possible causes are:

Incorrect fuel tank vacuum relief valve.
Incorrect fuel filler cap.
Fuel filler cap open or leaking.
Foreign matter in fuel filler cap.
Leak in hose between intake manifold and EVAP Canister Purge Volume Control Valve (EVAP-CPVCV).
Foreign matter in EVAP Canister Vent Control Valve (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 Canister Purge Control Valve (EVAP-CPCV).
Defective EVAP-CPVCV or circuit.
Defective EVAP Canister Purge Control Solenoid (EVAP-CPCS).
Defective absolute pressure sensor.
Defective fuel tank temperature sensor.
Defective MAP/BARO solenoid or circuit.
Blockage in MAP/BARO solenoid hose.
Leak between EVAP canister and EVAP-CVCV.
Defective water separator.
EVAP canister saturated with water.
Defective EVAP-CSPS.
Defective refueling control valve.
Leak in On Board Refueling Vapor Recovery (ORVR) system.