DTC Confirmation Test

NOTE: Before performing test, ensure ambient temperature is 32-86°F (0-30°C).

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 absolute pressure senor.
Defective fuel tank temperature sensor.
Defective water separator.
EVAP canister saturated with water.
Defective EVAP-CSPS.
Defective fuel level sensor or circuit.
Defective refueling EVAP vapor cut valve.
Leak in on-board refueling vapor recovery system.

NOTE: Before performing test, ensure fuel tank is 1/4-3/4 full, ambient temperature is 32-86°F (0-32°C) and EVAP-CPVCV hoses are installed correctly.

To set DTC, drive vehicle according to specified driving pattern to set System Readiness Test (SRT) codes. See SYSTEM READINESS TEST (SRT) CODES under ADDITIONAL SYSTEM FEATURES in SELF-DIAGNOSTICS - INTRODUCTION article. Stop vehicle and go to next step.
Select MODE 1 on scan tool and check SRT status of EVAP system. If EVAP system SRT is complete, system is okay at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If EVAP system SRT is incomplete, turn ignition off, wait at least 10 seconds and go to next step.

NOTE: It is not necessary to allow engine to cool before driving vehicle.

Perform driving pattern again. Select MODE 3. If DTC P0440, P1440 or P1447 is set, perform appropriate diagnostic procedure. If DTC P0440, P1440 or P1447 is not set, go to step 2.