PINPOINT TEST C: DTC P1450 EXCESSIVE VACUUM DETECTED IN THE FUEL TANK
NOTE:
Condition P1450 DTC set: more than -1.79 kPa (-7.2 inches H
2
O) over 30 seconds.
Connect the Evaporative Emissions
System Leak Tester to the fuel filler pipe.
Pressurize the EVAP system to 6.47 to
6.97 kPa (26 to 28 inches H
2
O).
Does the pressure drop immediately?
Yes
GO to
B6
.
No
INSTALL new fuel tank vapor line(s). REPEAT pinpoint test Step B5 to verify the repair. 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.
B6 CHECK FOR FAILED EVAP CANISTER
PURGE VALVE OR FUEL TANK PRESSURE
SENSOR
Use the recorded results from the PCM
DTCs.
Are DTC codes P0455 and P1443
present?
Yes
INSTALL a new EVAP canister purge valve. REFER to
Evaporative Emission Canister and Purge Valve
in this
section. CARRY OUT the evaporative emission system leak test. REFER to
Evaporative Emission System
Leak Test
in this section. If no leak is detected, CARRY OUT the evaporative emissions repair verification
drive cycle. REFER to
Evaporative Emission Repair Verification Drive Cycle
in this section.
No
INSTALL a new fuel vapor control valve tube assembly, fuel tank pressure sensor. REFER to
Section 310-00
.
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.
Test Step
Result / Action to Take
C1 CHECK FOR VISUAL CAUSES OF EXCESSIVE FUEL TANK
VACUUM
Check for kinks or bends in the fuel vapor hoses and tubes.
Visually check the EVAP canister inlet port, canister vent solenoid
filter or outlet hose for contamination or foreign material.
Check the canister vent solenoid for blockage or contamination.
Is a concern with a hose, tube, connection or component
visually evident?
Yes
REMOVE any contamination or foreign material around fuel vapor hoses and tubes.
REPAIR the hoses, tubes or components as necessary. After all visual concerns are
repaired, GO to
C2
.
No
GO to
C2
.
C2 CHECK FOR BLOCKAGE BETWEEN EVAP TEST PORT AND
CANISTER VENT SOLENOID
Disconnect and plug the EVAP return tube at the intake manifold.
Connect the Evaporative Emissions System Leak Tester to the
EVAP test port.
Pressurize the EVAP system to 3.48 kPa (14 inches H
2
O).
Does the pressure drop immediately?
Yes
GO to
C3
.
No
GO to Pinpoint Test D
.
C3 CHECK FOR BLOCKAGE BETWEEN THE FUEL FILLER PIPE
AND THE FUEL VAPOR TEE
Connect the Evaporative Emission System Leak Tester to the fuel
filler pipe.
Pressurize the EVAP system to 3.48 kPa (14 inches H
2
O).
Does the pressure drop immediately?
Yes
GO to
C4
.
No
GO to Pinpoint Test D
.
C4 CHECK FOR FUEL TANK PRESSURE SENSOR PID WITHOUT
PRESSURE APPLIED
Disconnect the EVAP canister outlet tube at the EVAP canister.
Key in ON position.
Access PCM PID FTP V.
Record the reading.
Is PID FTP V reading between 2.40 and 2.80 volts?
Yes
GO to
C5
.
No
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual to continue
diagnosis.
C5 CHECK FOR STUCK OPEN EVAP CANISTER PURGE VALVE
CONDITION AT IDLE
Connect the EVAP canister purge outlet tube.
Remove the plug from the EVAP return tube and reconnect the
tube to the intake manifold.
Verify that the fuel filler cap is correctly installed.
Key in ON position.
Access PCM PIDs FTP V and EVAPPDC.
Yes
INSTALL a new EVAP canister purge valve. REFER to
Evaporative Emission
Canister and Purge Valve
in this section. CARRY OUT an EVAP system leak test.
REFER to
Evaporative Emission System Leak Test
in this section. If the system
passes the leak test, CARRY OUT an evaporative emissions repair verification drive
cycle. REFER to
Evaporative Emission Repair Verification Drive Cycle
in this
section.
No
CARRY OUT the EVAP 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.
Page 6 of 8
2004 Freestar/Monterey Workshop Manual
10/9/2010
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS4W/~MUS~LEN/20/...
