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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD2004EXPLORER 2WD V6-4.0L VIN EREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEVAPORATIVE EMISSIONS SYSTEMDESCRIPTION AND OPERATIONEVAPORATIVE EMISSIONS
2004 Ford Explorer 2WD V6-4.0L VIN E
Evaporative Emissions
2004 Ford Explorer 2WD V6-4.0L VIN ESECTION Evaporative Emissions
EVAPORATIVE EMISSIONS
The evaporative emission (EVAP) system:
- prevents hydrocarbon emissions from reaching the atmosphere.
- stores fuel vapors in the EVAP canister that are generated during vehicle operation or hot soak, until they can be consumed by the engine during normal engine operation.
- routes the stored fuel vapors to the engine during engine operation.
- is controlled by the powertrain control module (PCM) which, using various sensor inputs, calculates the desired amount of purge flow. The PCM regulates the purge flow, induced by the application of intake manifold vacuum, by varying the duty cycle applied to the EVAP canister purge valve.
- has an EVAP test port for test purposes.
The fuel vapors are routed:
- from the fuel tank through the fill limit valve and fuel vapor vent valve. The fuel vapor vent valves are part of the fuel tank assembly and cannot be serviced separately.
- to the EVAP canisters through a vapor line.
- to the engine when the EVAP canister purge valve is opened by the PCM.
The fuel tank pressure (FTP) sensor:
- monitors the pressure levels in the fuel tank.
- communicates the pressure reading to the PCM during the OBD II leak test.
The EVAP canisters:
- are located on top of the fuel tank.
- contain activated carbon.
- store fuel vapors.
The fuel tank filler cap:
- relieves system vacuum below 3.8 kPa (15.26 inches H2O).
The canister vent solenoid:
- is normally open.
- seals the evaporative emissions system for the inspection and maintenance (I/M 240) test and OBD II leak and pressure tests.
The EVAP canister purge valve:
- is normally closed.
- regulates the purging of the EVAP canister.
- is controlled by the PCM.
The EVAP system test port:
- is located on the EVAP canister purge valve.
- is used to connect the Evaporative Emissions System Tester to the EVAP system.
The evaporative emission dust separator:
- prevents suspended dust and dirt particles from entering the evaporative emission system.
- is serviced as a separate item.
The evaporative emission system monitor:
- is a self-test strategy within the PCM which tests the integrity of the EVAP system.
- monitors the EVAP system for leaks.
- monitors electronic EVAP components for irrationally high or low voltages.
- monitors for correct EVAP system operation.
- uses negative leak test methods to test and activate the EVAP system.
- an engine malfunction light will be displayed by the message center if the EVAP system fails the test.
The EVAP running loss system leak test:
- utilizes intake manifold vacuum to test the system and involves several stages.
The evaporative emission (EVAP) system:
- prevents hydrocarbon emissions from reaching the atmosphere.
- stores fuel vapors in the EVAP canister that are generated during vehicle operation or hot soak, until they can be consumed by the engine during normal engine operation.
- routes the stored fuel vapors to the engine during engine operation.
- is controlled by the powertrain control module (PCM) which, using various sensor inputs, calculates the desired amount of purge flow. The PCM regulates the purge flow, induced by the application of intake manifold vacuum, by varying the duty cycle applied to the EVAP canister purge valve.
- has an EVAP test port for test purposes.
The fuel vapors are routed:
- from the fuel tank through the fill limit valve and fuel vapor vent valve. The fuel vapor vent valves are part of the fuel tank assembly and cannot be serviced separately.
- to the EVAP canisters through a vapor line.
- to the engine when the EVAP canister purge valve is opened by the PCM.
The fuel tank pressure (FTP) sensor:
- monitors the pressure levels in the fuel tank.
- communicates the pressure reading to the PCM during the OBD II leak test.
The EVAP canisters:
- are located on top of the fuel tank.
- contain activated carbon.
- store fuel vapors.
The fuel tank filler cap:
- relieves system vacuum below 3.8 kPa (15.26 inches H2O).
The canister vent solenoid:
- is normally open.
- seals the evaporative emissions system for the inspection and maintenance (I/M 240) test and OBD II leak and pressure tests.
The EVAP canister purge valve:
- is normally closed.
- regulates the purging of the EVAP canister.
- is controlled by the PCM.
The EVAP system test port:
- is located on the EVAP canister purge valve.
- is used to connect the Evaporative Emissions System Tester to the EVAP system.
The evaporative emission dust separator:
- prevents suspended dust and dirt particles from entering the evaporative emission system.
- is serviced as a separate item.
The evaporative emission system monitor:
- is a self-test strategy within the PCM which tests the integrity of the EVAP system.
- monitors the EVAP system for leaks.
- monitors electronic EVAP components for irrationally high or low voltages.
- monitors for correct EVAP system operation.
- uses negative leak test methods to test and activate the EVAP system.
- an engine malfunction light will be displayed by the message center if the EVAP system fails the test.
The EVAP running loss system leak test:
- utilizes intake manifold vacuum to test the system and involves several stages.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.