Ford 2003 Mustang Workshop Manual page 2155

Procedure in this section.
Pressurize the EVAP system to 3.48
kPa (14 inches H
Using the ultrasonic leak detector,
check the fuel vapor control valve tube
to the fuel tank for leaks. Check the
fuel tank pressure sensor, fuel vapor
control valve tube and the fuel filler
pipe. Check fuel tank to EVAP canister
- canister vent solenoid.
Is a leak detected?
A10 CHECK EVAP SYSTEM AT FUEL
FILLER PIPE
Reconnect the EVAP canister purge
outlet tube to the fuel vapor tee.
Complete the evaporative emission
system leak test. Refer to
Emission System Leak Test
section.
Does the EVAP system pass the
leak test?
PINPOINT TEST B: DTC P0455 MAJOR LEAK OR NO FLOW
DETECTED OR DTC P1443 VERY SMALL OR NO PURGE FLOW
DETECTED IN SYSTEM
Test Step
NOTE: Condition DTC P0455 set: –1.74 kPa (-7.0 inches H
NOTE: Condition DTC P1443 set: –1.74 kPa (-7.0 inches H
0.02 lb/min vapor flow.
B1 CHECK FOR DIAGNOSTIC
TROUBLE CODE P0455 OR
P1443
Use the recorded results
from the PCM DTCs.
Is DTC P0455 present?
B2 VISUALLY CHECK FOR
GROSS EVAP SYSTEM LEAKS
Check for the presence of a
fuel filler cap. Do not tighten
or check for correct
installation at this time.
Check the input port
vacuum and EVAP return
tube are connected to the
EVAP canister purge valve.
Check that the canister vent
solenoid is correctly
attached to the EVAP
O).
2
Evaporative
in this
Yes
GO to B2 .
No
GO to B3 .
Yes
REPAIR or INSTALL new EVAP components as necessary.
GO to B3 .
No
GO to B3 .
Yes
RESTORE the system to normal operation.
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 emissions repair verification drive
cycle. REFER to Evaporative Emission Repair
Verification Drive Cycle
No
GO to A6 .
Result / Action to Take
O) over 30 seconds.
2
O) over 30 seconds with more than
2
in this section.