Ford 2003 Mustang Workshop Manual page 2153

manifold.
Complete the evaporative emission
system leak test. Refer to
Emission System Leak Test
section.
Does the system pass the leak test?
A3 VISUALLY INSPECT THE FUEL
FILLER CAP
Visually inspect the fuel filler cap for
damage.
Is the fuel filler cap damaged?
A4 CHECK FOR SMALL LEAKS AT THE
FUEL FILLER CAP AND EVAP TEST PORT
Connect the Evaporative Emission
System Leak Tester to the fuel filler
pipe.
Key in ON position.
Close the canister vent solenoid. Refer
to Canister Vent Solenoid Closing
Procedure in this section.
Pressurize the EVAP system to 3.48
kPa (14 inches H
Using the ultrasonic leak detector,
check the fuel filler cap and EVAP test
port for leaks.
Is a leak detected?
A5 CHECK FOR CONCERN OTHER THAN
THE FUEL FILLER CAP
Refer to previous test results.
Did the system pass the evaporative
emission system leak test carried
out in pinpoint test Step A2?
A6 CHECK FOR SMALL LEAK WITH
TESTER SET AT FILL POSITION
Connect the Evaporative Emission
System Leak Tester to the EVAP test
port.
Key in ON position.
Close the canister vent solenoid. Refer
to Canister Vent Solenoid Closing
Procedure in this section.
Turn the selector on the Evaporative
Emission System Leak Tester to the
FILL position.
Pressurize the EVAP system to 3.48
kPa (14 inches H
Does the pressure on the EVAP
system hold between 3.43 kPa and
3.53 kPa (13.80 inches and 14.20
Evaporative
in this
O).
2
O).
2
No
GO to A4 .
Yes
INSTALL a new fuel filler cap. GO to
No
GO to A4 .
Yes
REPAIR or INSTALL new components as
necessary. GO to A5 .
No
INSTALL the fuel filler cap. CARRY OUT the
evaporative emission system leak test. REFER
to Evaporative Emission System Leak Test
this section. If the system passes the leak test,
CARRY OUT the evaporative emissions repair
verification drive cycle. REFER to
Emission Repair Verification Drive Cycle
section.
Yes
CARRY OUT the evaporative emission system
leak test. REFER to Evaporative Emission
System Leak Test in this section. If the system
passes the leak test, CARRY OUT the
evaporative emission repair verification drive
cycle. REFER to Evaporative Emission Repair
Verification Drive Cycle
No
INSTALL the fuel filler cap. GO to
Yes
GO to A7 .
No
DISCONTINUE pressurizing the system. GO to
A8 .
A4 .
in
Evaporative
in this
in this section.
A6 .