PINPOINT TEST B: DTC P0455 MAJOR LEAK OR NO FLOW DETECTED OR DTC P1443 VERY SMALL OR NO PURGE FLOW DETECTED IN SYSTEM
NOTE:
Condition DTC P0455 set: -1.74 kPa (-7.0 inches H
2
O) over 30 seconds.
NOTE:
Condition DTC P1443 set: -1.74 kPa (-7.0 inches H
2
O) over 30 seconds with more than 0.02 lb/min vapor flow.
Turn the Evaporative Emission System Leak Tester
selector to the FILL position.
Pressurize the EVAP system to 3.48 kPa (14 inches
H
2
O).
Using the ultrasonic leak detector, check the fuel
tank vapor tube to the fuel tank for leaks. Check the
fuel tank pressure sensor, fuel tank vapor tube and
the fuel filler pipe.
Is a leak detected?
No
GO to
A10
.
A10 CHECK EVAP SYSTEM AT FUEL FILLER PIPE
Reconnect the fuel tank vapor tube (9C047) to the
fuel vapor tee.
Complete the evaporative emission system leak test.
Refer to
Evaporative Emission System Leak Test
in
this section.
Does the EVAP system pass the leak test?
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
in this section.
No
GO to
A6
.
Test Step
Result / Action to Take
B1 CHECK FOR DIAGNOSTIC TROUBLE
CODE P0455 OR P1443
Use the recorded results from the PCM
DTCs.
Is DTC P0455 present?
Yes
GO to
B2
.
No
GO to
B3
.
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 canister.
Check for disconnected or cracked fuel
vapor hoses or tubes between the intake
manifold and the following components:
EVAP canister purge valve
EVAP canisters
fuel vapor vent valve assembly
fuel tank vapor tube assembly
Check for damaged fuel tank or fuel filler
pipe.
Is a concern with a hose, tube,
connection or valve visually evident?
Yes
REPAIR or INSTALL new EVAP components as necessary. GO to
B3
.
No
GO to
B3
.
B3 CHECK FOR EVAP SYSTEM LEAKS
Disconnect the EVAP return tube from
the intake manifold and plug the EVAP
return tube.
Connect the Evaporative Emissions
System Leak Tester to the EVAP test
port.
Carry out the evaporative emissions
system leak test. Refer to
Evaporative
Emission System Leak Test
in this
section.
Does the system pressure stay above
1.99 kPa (8 inches H
2
O)?
Yes
GO to
B4
.
No
VERIFY that the fuel filler cap is installed correctly. REPAIR or INSTALL new components as necessary.
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
in this section.
B4 CHECK FOR BLOCKAGE BETWEEN
THE EVAP CANISTER PURGE VALVE AND
FUEL VAPOR TEE
Key in the 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
2
O).
Open the canister vent solenoid.
Does the pressure drop immediately?
Yes
GO to
B5
.
No
INSTALL a new vapor line between the EVAP canister purge valve and the fuel vapor tee. 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
in this section.
B5 CHECK FOR BLOCKAGE BETWEEN
FUEL FILLER PIPE AND THE FUEL VAPOR
TEE
Page 5 of 8
2004 Freestar/Monterey Workshop Manual
10/9/2010
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS4W/~MUS~LEN/20/...
