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