Ford 2003 Mustang Workshop Manual page 2146

prevents hydrocarbon emissions from reaching the atmosphere.
stores fuel vapors in the evaporative emission (EVAP) canister that are generated during
vehicle operation or hot soak, or vehicle refueling, until they can be consumed by the engine.
routes the stored fuel vapors to the engine during engine operation.
is controlled by the powertrain control module (PCM) which uses various sensor inputs to
calculate 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 evaporative emission test port for test purposes.
The fuel vapors are routed:
from the fuel tank through the fuel vapor control valve and fuel vapor vent valve.
to the EVAP canister 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 OBDII leak test.
is located in-line above the fuel tank and is serviced as part of the fuel vapor control valve tube
assembly.
The evaporative emission canister:
is located in the left rear quarter panel.
contains activated carbon.
stores fuel vapor.
The fuel tank filler cap:
relieves system pressure above 14 kPa (56.21 inches H
relieves system vacuum below 3.8 kPa (15.26 inches H
The canister vent solenoid:
is normally open.
seals the EVAP system for the inspection and maintenance (I/M 240) test and OBDII leak and
pressure tests.
is mounted to the evaporative emission canister.
is repaired as a separate item.
The evaporative emission (EVAP) canister purge valve:
is normally closed.
regulates purging of the EVAP canister.
is controlled by the PCM.
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