Ford F150 Pickup. Manual — part 1359

6. Testing EVAP Canister Vent Solenoid For Blockage

Reconnect fuel vapor control valve tube from EVAP canister purge outlet tube. Lower differential to
access canister vent solenoid. See appropriate DIFFERENTIALS article in DRIVE AXLES. Disconnect
canister vent solenoid from canister vent hose. Pressurize system to 14 in. H2O (3.48 kPa). If pressure
does not drop immediately, go to next step. If pressure drops immediately, replace canister vent solenoid.
Reconnect all components. Perform evaporative emissions system leak test. See EVAPORATIVE
EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK &
EVAP MONITOR "BYPASS" CHECK is performed.

7. Testing Canister Vent Solenoid Hose Assembly For Blockage

Reinstall differential. Lower rear subframe to access EVAP canister and bracket assembly. Lower EVAP
canister and bracket assembly. Disconnect canister vent solenoid hose from 1.0L EVAP canister. See Fig.
8 . Pressurize system to 14 in. H2O (3.48 kPa). If pressure drops immediately, replace canister vent
solenoid hose assembly. Perform evaporative emissions system leak test. See EVAPORATIVE
EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK &
EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately, go to next
step.

Fig. 8: Identifying EVAP Canister Hoses (LS & Thunderbird)

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

Courtesy of FORD MOTOR CO.

8. Testing 1.0L EVAP Canister

Disconnect fuel vapor storage EVAP canister inlet tube at 1.0L EVAP canister. See Fig. 8 . Pressurize
system to 14 in. H2O (3.48 kPa). If pressure drops immediately, replace 1.0L EVAP canister. Perform
evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST .
If system passes, perform DRIVE CYCLES in SELF-DIAGNOSTICS - CNG, FLEX-FUEL &
GASOLINE article. Ensure PENDING CODE CHECK & EVAP MONITOR "BYPASS" CHECK is
performed. If pressure does not drop immediately, go to next step.

9. Testing Fuel Vapor Storage Canister Inlet Tube

Disconnect fuel vapor storage canister inlet tube from 2.0L EVAP canister. See Fig. 8 . Pressurize system
to 14 in. H2O (3.48 kPa). If pressure drops immediately, replace fuel vapor storage canister inlet tube.
Reconnect all components. Perform evaporative emissions system leak test. See EVAPORATIVE
EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK &
EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately, go to next
step.

10. Testing 2.0L EVAP Canister

Disconnect EVAP canister purge outlet tube at 2.0L EVAP canister. See Fig. 8 . Pressurize system to 14
in. H2O (3.48 kPa). If pressure drops immediately, replace 2.0L EVAP canister. Reconnect all
components. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS
SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-DIAGNOSTICS -
CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK & EVAP MONITOR
"BYPASS" CHECK is performed. If pressure does not drop immediately, replace EVAP canister purge
outlet tube. Reconnect all components. Perform evaporative emissions system leak test. See
EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE
CHECK & EVAP MONITOR "BYPASS" CHECK is performed.

Mustang

1. Testing Fuel Tank Pressure Sensor - Connect Evaporative Emissions System Leak Tester (134-00056)

to fuel filler pipe. Turn ignition on. Using scan tool, close canister vent solenoid. Select OUTPUT TEST
MODE, FTP and FTP V PID. Select ALL OFF mode. Press START button on scan tool to close canister
vent solenoid. Pressurize system to 14 in. H2O (3.48 kPa). If FTP V PID is 4.22-4.90 volts, go to next
step. If FTP V PID is not 4.22-4.90 volts, go to step 3 .

2. Testing Venting Portion Of EVAP System For Blockage

Using scan tool, open canister vent solenoid by selecting STOP button. If pressure drops immediately,
perform DRIVE CYCLES in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
Ensure PENDING CODE CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

does not drop immediately, go to step 7 .

3. Testing Fuel Tank Pressure Sensor Operation

Move EVAP tester to evaporative emission test port. Turn ignition on. Using scan tool, close canister
vent solenoid. Select OUTPUT TEST MODE, FTP and FTP V PID. Select ALL OFF mode. Press
START button on scan tool to close canister vent solenoid. Pressurize system to 14 in. H2O (3.48 kPa). If
FTP V PID is 4.22-4.90 volts, go to next step. If FTP V PID is not 4.22-4.90 volts, perform TEST HX:
EVAPORATIVE EMISSION MONITOR & SYSTEM under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

4. Testing For Location Of Blockage

Using scan tool, open canister vent solenoid by selecting STOP button. If pressure drops immediately, go
to next step. If pressure does not drop immediately, go to step 7 .

5. Testing For Pinched Or Blocked Fuel Vapor Control Valve Tube

Lower fuel tank about 3/4" (19 mm). Connect EVAP tester to fuel filler pipe. Turn ignition on. Using
scan tool, close canister vent solenoid. Select OUTPUT TEST MODE, FTP and FTP V PID. Select ALL
OFF mode. Press START button on scan tool to close canister vent solenoid. Pressurize system to 14 in.
H2O (3.48 kPa). If FTP V PID is 4.22-4.90 volts, replace fuel vapor control tube assembly. Perform
evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST .
If system passes, perform DRIVE CYCLES in SELF-DIAGNOSTICS - CNG, FLEX-FUEL &
GASOLINE article. Ensure PENDING CODE CHECK & EVAP MONITOR "BYPASS" CHECK is
performed. If FTP V PID is not 4.22-4.90 volts, go to next step.

6. Testing Fuel Filler Tube Assembly

Disconnect tank vapor recirculation hose at fuel filler pipe and plug both openings. Pressurize system to
14 in. H2O (3.48 kPa). Remove plug from tank vapor recirculation hose. If pressure drops immediately,
replace fuel vapor control valve tube assembly. Perform evaporative emissions system leak test. See
EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE
CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately,
replace fuel filler pipe assembly. Perform evaporative emissions system leak test. See EVAPORATIVE
EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK &
EVAP MONITOR "BYPASS" CHECK is performed.

7. Testing Fresh Air Vent Hose

Disconnect fresh air vent hose from inside trunk. Pressurize system to 14 in. H2O (3.48 kPa). If pressure
drops immediately, replace fresh air vent hose. Perform evaporative emissions system leak test. See
EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE
CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately,

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

go to next step.

8. Testing Fresh Air Vent Hose At Fuel Filler Pipe

Disconnect fresh air vent hose at fuel filler pipe. Pressurize system to 14 in. H2O (3.48 kPa). If pressure
drops immediately, replace fuel filler pipe. Perform evaporative emissions system leak test. See
EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE
CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately,
go to next step.

9. Testing Tank Vapor Valve Assembly

Disconnect tank vapor valve assembly fresh air tube from canister vent solenoid vent hose. Pressurize
system to 14 in. H2O (3.48 kPa). If pressure drops immediately, replace tank vapor valve assembly fresh
air tube. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM
LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article. Ensure PENDING CODE CHECK & EVAP MONITOR "BYPASS"
CHECK is performed. If pressure does not drop immediately, go to next step.

10. Testing Canister Vent Solenoid Hose Assembly For Blockage

Disconnect canister vent solenoid hose assembly. Pressurize system to 14 in. H2O (3.48 kPa). If pressure
drops immediately, replace canister vent solenoid hose assembly. Perform evaporative emissions system
leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform
DRIVE CYCLES in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure
PENDING CODE CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not
drop immediately, go to next step.

11. Testing Canister Vent Solenoid For Blockage

Remove canister vent solenoid. Pressurize system to 14 in. H2O (3.48 kPa). If pressure drops
immediately, replace canister vent solenoid. Perform evaporative emissions system leak test. See
EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE
CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately,
go to next step.

12. Testing EVAP Canister

Disconnect EVAP canister inlet elbow tube. Pressurize system to 14 in. H2O (3.48 kPa). If pressure drops
immediately, replace EVAP canister. Perform evaporative emissions system leak test. See
EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE
CHECK & EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately,
go to next step.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline