SECTION 303-13: Evaporative Emissions
| 2014 Mustang Workshop Manual
|
DESCRIPTION AND OPERATION
| Procedure revision date: 01/07/2013
|
Evaporative Emissions
The
system consists of the:
- canister purge valve.
- canister assembly (includes the
canister vent solenoid).
- fuel vapor tube assembly (includes the
sensor).
- Easy Fuel
TM
(capless) fuel tank filler pipe
The
system:
- utilizes an
system that captures the fuel vapors from the vehicle's fuel tank during refueling.
- prevents hydrocarbon emissions from reaching the atmosphere.
- stores fuel vapors in the
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 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
canister purge valve.
The fuel vapors are routed:
- from the fuel tank to the
canister through the fuel vapor tube assembly.
- to the engine when the
canister purge valve is opened by the PCM.
The
canister assembly:
- is located under the rear of the vehicle, just behind the fuel tank.
- includes the
canister vent solenoid.
- contains activated carbon.
- stores fuel vapors.
The
canister purge valve:
- is normally closed.
- regulates purging of the
canister.
- is controlled by the PCM.
- is direct mounted on the engine.
The
canister vent solenoid:
- is normally open.
- seals the
system for the inspection and maintenance (I/M 240) test and
II leak and pressure tests.
- is serviced as part of the
canister assembly and as a separate component.
The Easy Fuel
TM
(capless) fuel tank filler pipe:
- relieves system vacuum below -3.5 kPa (-16.00 in H
2
O).
The
sensor:
- is serviced as part of the fuel vapor tube assembly.
- monitors the pressure levels in the fuel tank.
- communicates the pressure reading to the PCM during the
II leak test.
The fuel vapor tube assembly:
- includes the
sensor.
- prevents suspended liquid fuel from being drawn into the
canister along with the fuel vapors.
- returns the liquid to the fuel tank.
- routes vapors between the canister vent solenoid and the fuel tank filler pipe assembly.
The
system monitor:
- is a self-test strategy within the PCM which tests the integrity of the
system. For additional information on the operation of the system monitor, refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
Vehicle Emission Vacuum Routing
3.7L
| Item
| Part Number
| Description
| | 1
| 6A505
| LH valve cover
|
| 2
| 9R530
| outlet tube
|
| 3
| 9G866
| canister purge valve
|
| 4
| 9424
| Intake manifold
|
| 5
| 6A666
| PCV valve
|
| 6
| 6582
| RH valve cover
|
| 7
| 9002
| Fuel tank
|
| 8
| —
| sensor (part of 9E325)
|
| 9
| 9034
| Fuel tank filler pipe
|
| 10
| 9E857
| canister
|
5.0L (4V)
| Item
| Part Number
| Description
| | 1
| 9B659
| outlet pipe
|
| 2
| 9425
| Intake manifold
|
| 3
| 6582
| RH valve cover
|
| 4
| 6A505
| LH valve cover
|
| 5
| —
| PCV valve (part of LH valve cover)
|
| 6
| 9G866
| canister purge valve
|
| 7
| 9002
| Fuel tank
|
| 8
| —
| sensor (part of 9E325)
|
| 9
| 9034
| Fuel tank filler pipe
|
| 10
| 9E857
| canister
|
5.8L (4V)
| Item
| Part Number
| Description
| | 1
| 9G756
| Fuel rail pressure and temperature sensor
|
| 2
| 9R504
| outlet pipe
|
| 3
| 9Y456
| EGR system module
|
| 4
| 6F066
|
|
| 5
| 9G866
| canister purge valve
|
| 6
| 6A666
| PCV valve
|
| 7
| 6582
| RH valve cover
|
| 8
| 9424
| Upper intake manifold
|
| 9
| 6A505
| LH valve cover
|
| 10
| 6F066
| bypass vacuum actuator
|
| 11
| 9002
| Fuel tank
|
| 12
| —
| sensor (part of 9E325)
|
| 13
| 9034
| Fuel tank filler pipe
|
| 14
| 9E857
| canister
|