Ford F150 Pickup. Instruction - part 1600

seconds. 

Focus 

1) Check For Visual Cause Of Excessive Fuel Tank Vacuum 
 
Check for kinks or bends in fuel vapor hoses and tubes. Inspect EVAP canister inlet port, canister vent 
solenoid filter or outlet hose for contamination or foreign material. Check canister vent solenoid for 
blockage or contamination. If any conditions are present, repair, replace or clean as necessary and go to 
next step. If no conditions are present, go to next step. 

2) Check For Blockage Between EVAP Test Port & EVAP Canister Vent Solenoid 
 
Disconnect and plug EVAP return tube at intake manifold. Plug canister vent solenoid or canister vent 
hose. Connect evaporative emissions system leak tester to EVAP test port. Pressurize system to 14 in. 
H2O (3.48 kPa). Remove plug from canister vent solenoid or canister vent hose. If pressure drops 
immediately, go to next step. If pressure does not drop immediately, perform HISSING SOUND WHEN 
REMOVING FUEL CAP symptom test under EVAPORATIVE EMISSION SYSTEM TESTS in 
SYSTEM & COMPONENT TESTING - GASOLINE article. 

3) Check Fuel Filler Cap 
 
Connect evaporative emissions system leak tester to fuel filler pipe and install fuel filler cap. Turn 
ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID 
CLOSING PROCEDURE. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Using ultrasonic leak 
detector, slowly check fuel filler cap and EVAP test port. If a leak is detected, repair or replace 
component and repeat step 3) to verify repair. If no leak is detected, go to next step. 

4) Check For Blockage Between EVAP Test Port & Fuel Tank With Fuel Filler Cap Removed 
 
Turn ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID 
CLOSING PROCEDURE. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Remove fuel filler cap. 
If pressure drops immediately, go to next step. If pressure does not drop immediately, perform HISSING 
SOUND WHEN REMOVING FUEL CAP symptom test under EVAPORATIVE EMISSION 
SYSTEM TESTS in SYSTEM & COMPONENT TESTING - GASOLINE article. 

5) Check Fuel Tank Pressure Sensor PID With Fuel Filler Cap Removed 
 
Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Ensure fuel filler 
cap is removed. Turn ignition switch to ON position. Using scan tool, access PCM FTP V PID from 
PID/DATA MONITOR & RECORD menu. Record FTP V PID value. If FTP V PID is 2.40-2.80 volts, 
go to next step. If FTP V PID is not as specified, go to TEST HX, step 21) under SYSTEM TESTS. 

6) Check for Stuck Open EVAP Canister Purge Valve Condition At Idle 
 
Open canister vent solenoid. Refer to CANISTER VENT SOLENOID CLOSING PROCEDURE. 
Remove plug from EVAP return tube and reconnect tube to intake manifold. Ensure fuel filler cap is 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

properly installed. Turn ignition switch to ON position. Select PCM FTP V and EVAPPDC PIDs from 
PID/DATA MONITOR & RECORD menu. Start engine and allow to idle. When EVAPPDC PID is zero, 
FTP V PID should be less than 2.40 volts. If PCM PID values are as specified, replace EVAP canister 
purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST. If EVAP system passes 
leak test, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE. If 
PCM PID values are not as specified, perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST. 
If EVAP system passes leak test, perform EVAPORATIVE EMISSION REPAIR VERIFICATION 
DRIVE CYCLE.  

F150 

1) Check For Visual Cause Of Excessive Fuel Tank Vacuum 
 
Check for kinks or bends in fuel vapor hoses and tubes. Inspect EVAP canister inlet port and canister vent 
solenoid for contamination or foreign material. If any conditions are present, repair, replace or clean as 
necessary and go to next step. If no conditions are present, go to next step. 

2) Check For Blockage Between EVAP Test Port & EVAP Canister Vent Solenoid 
 
Disconnect and plug EVAP return tube at intake manifold. Plug canister vent solenoid or canister vent 
hose. Connect evaporative emissions system leak tester to EVAP test port. Pressurize system to 14 in. 
H2O (3.48 kPa). Remove plug from canister vent solenoid or canister vent hose. If pressure drops 
immediately, go to next step. If pressure does not drop immediately, perform HISSING SOUND WHEN 
REMOVING FUEL CAP symptom test under EVAPORATIVE EMISSION SYSTEM TESTS in 
SYSTEM & COMPONENT TESTING - GASOLINE article. 

3) Check Fuel Filler Cap 
 
Connect evaporative emissions system leak tester to fuel filler pipe and install fuel filler cap. Turn 
ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID 
CLOSING PROCEDURE. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Using ultrasonic leak 
detector, slowly check fuel filler cap and EVAP test port. If a leak is detected, repair or replace 
component and repeat this step to verify repair. If no leak is detected, go to next step. 

4) Check For Blockage Between EVAP Test Port & Fuel Tank 
 
Turn ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID 
CLOSING PROCEDURE. Pressurize EVAP system to 14 in. H2O (3.48 kPa). Depress the Schrader 
valve in the emission test port. If pressure drops immediately, go to next step. If pressure does not drop 
immediately, perform HISSING SOUND WHEN REMOVING FUEL CAP symptom test under 
EVAPORATIVE EMISSION SYSTEM TESTS in SYSTEM & COMPONENT TESTING - GASOLINE 
article. Connect evaporative emissions system leak tester to fuel filler pipe. Pressurize EVAP system to 
14 in. H2O (3.48 kPa). If pressure drops immediately, go to next step. If pressure does not drop 
immediately, perform HISSING SOUND WHEN REMOVING FUEL CAP symptom test under 
EVAPORATIVE EMISSION SYSTEM TESTS in SYSTEM & COMPONENT TESTING - GASOLINE 
article. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

5) Check Fuel Tank Pressure Sensor PID Without Pressure Applied 
 
Disconnect EVAP canister outlet tube. Connect scan tool to Data Link Connector (DLC). Turn ignition 
switch to ON position. Using scan tool, access PCM FTP V PID from PID/DATA MONITOR & 
RECORD menu. Record FTP V PID value. If FTP V PID is 2.40-2.80 volts, go to next step. If FTP V 
PID is not as specified, go to TEST HX, step 21) under SYSTEM TESTS. 

6) Check for Stuck Open EVAP Canister Purge Valve Condition At Idle 
 
Reconnect EVAP canister outlet tube. Remove plug from EVAP return tube and reconnect tube to intake 
manifold. Ensure fuel filler cap is properly installed. Turn ignition switch to ON position. Select PCM 
FTP V and EVAPPDC PIDs from PID/DATA MONITOR & RECORD menu. Start engine and allow to 
idle. When EVAPPDC PID is zero, FTP V PID should be less than 2.40 volts. If PCM PID values are as 
specified, replace EVAP canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM 
LEAK TEST. If EVAP system passes leak test, perform EVAPORATIVE EMISSION REPAIR 
VERIFICATION DRIVE CYCLE. If PCM PID values are not as specified, perform EVAPORATIVE 
EMISSIONS SYSTEM LEAK TEST. If EVAP system passes leak test, perform EVAPORATIVE 
EMISSION REPAIR VERIFICATION DRIVE CYCLE.  

Sable & Taurus 

1) Check For Visual Cause Of Excessive Fuel Tank Vacuum 
 
Check for kinks or bends in fuel vapor hoses and tubes. Inspect EVAP canister inlet port, canister vent 
solenoid, EVAP dust separator (if equipped) or outlet hose for contamination or foreign material. Check 
canister vent solenoid for blockage or contamination. If any conditions are present, repair, replace or 
clean as necessary and go to next step. If no conditions are present, go to next step. 

2) Check For Blockage Between EVAP Test Port & EVAP Canister Vent Solenoid 
 
Disconnect and plug EVAP return tube at intake manifold. Connect Evaporative Emissions System Leak 
Tester (134-00056) to EVAP test port. Pressurize system to 14 in. H2O (3.48 kPa). If pressure drops 
immediately, go to next step. If pressure does not drop immediately, perform HISSING SOUND WHEN 
REMOVING FUEL CAP symptom test under EVAPORATIVE EMISSION SYSTEM TESTS in 
SYSTEM & COMPONENT TESTING - GASOLINE article. 

3) Check For Blockage Between Fuel Filler Pipe & EVAP Canister 
 
Connect evaporative emissions system leak tester to fuel filler pipe. Pressurize EVAP system to 14 in. 
H2O (3.48 kPa). If pressure drops immediately, go to next step. If pressure does not drop immediately, 
perform HISSING SOUND WHEN REMOVING FUEL CAP symptom test under EVAPORATIVE 
EMISSION SYSTEM TESTS in SYSTEM & COMPONENT TESTING - GASOLINE article. 

4) Check Fuel Tank Pressure Sensor PID Without Pressure Applied 
 
Disconnect fuel vapor valve tube from EVAP canister. Connect scan tool to Data Link Connector (DLC). 
Turn ignition switch to ON position. Using scan tool, access PCM FTP V PID from PID/DATA 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

MONITOR & RECORD menu. Record FTP V PID value. If FTP V PID is 2.40-2.80 volts, go to next 
step. If FTP V PID is not as specified, go to TEST HX, step 21) under SYSTEM TESTS. 

5) Check for Stuck Open EVAP Canister Purge Valve Condition At Idle 
 
Reconnect fuel vapor valve tube. Remove plug from EVAP return tube and reconnect tube to intake 
manifold. Ensure fuel filler cap is properly installed. Turn ignition switch to ON position. Select PCM 
FTP V and EVAPPDC PIDs from PID/DATA MONITOR & RECORD menu. Start engine and allow to 
idle. When EVAPPDC PID is zero, FTP V PID should be less than 2.40 volts. If PCM PID values are as 
specified, replace EVAP canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM 
LEAK TEST. If EVAP system passes leak test, perform EVAPORATIVE EMISSION REPAIR 
VERIFICATION DRIVE CYCLE. If PCM PID values are not as specified, perform EVAPORATIVE 
EMISSIONS SYSTEM LEAK TEST. If EVAP system passes leak test, perform EVAPORATIVE 
EMISSION REPAIR VERIFICATION DRIVE CYCLE.  

All Others 

1) Check For Visual Cause Of Excessive Fuel Tank Vacuum 
 
Check for kinks or bends in fuel vapor hoses and tubes. Inspect EVAP canister inlet port, canister vent 
solenoid, EVAP dust separator (if equipped) or outlet hose for contamination or foreign material. Check 
canister vent solenoid for blockage or contamination. If any conditions are present, repair, replace or 
clean as necessary and go to next step. If no conditions are present, go to next step. 

2) Check For Blockage Between EVAP Test Port & EVAP Canister Vent Solenoid 
 
Disconnect and plug EVAP return tube at intake manifold. Connect Evaporative Emissions System Leak 
Tester (134-00056) to EVAP test port. Pressurize system to 14 in. H2O (3.48 kPa). If pressure drops 
immediately, go to next step. If pressure does not drop immediately, perform HISSING SOUND WHEN 
REMOVING FUEL CAP symptom test under EVAPORATIVE EMISSION SYSTEM TESTS in 
SYSTEM & COMPONENT TESTING - GASOLINE article. 

3) Check For Blockage Between Fuel Filler Pipe & Fuel Vapor "T" Fitting 
 
Connect evaporative emissions system leak tester to fuel filler pipe. Pressurize EVAP system to 14 in. 
H2O (3.48 kPa). If pressure drops immediately, go to next step. If pressure does not drop immediately, 
perform HISSING SOUND WHEN REMOVING FUEL CAP symptom test under EVAPORATIVE 
EMISSION SYSTEM TESTS in SYSTEM & COMPONENT TESTING - GASOLINE article. 

4) Check Fuel Tank Pressure Sensor PID Without Pressure Applied 
 
Disconnect EVAP canister outlet tube from EVAP canister. Connect scan tool to Data Link Connector 
(DLC). Turn ignition switch to ON position. Using scan tool, access PCM FTP V PID from PID/DATA 
MONITOR & RECORD menu. Record FTP V PID value. If FTP V PID is 2.40-2.80 volts, go to next 
step. If FTP V PID is not as specified, go to TEST HX, step 21) under SYSTEM TESTS. 

5) Check for Stuck Open EVAP Canister Purge Valve Condition At Idle 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline