Ford F150 Pickup. Instruction - 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