Ford F150 Pickup. Instruction - part 1354

Fig. 6: Identifying ISO Micro Relay Terminals 
Courtesy of FORD MOTOR CO. 

EGR VACUUM REGULATOR SOLENOID 

See TEST HE: EGR SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & 
GASOLINE article. 

EVAP CANISTER VENT SOLENOID 

Turn ignition off. Disconnect Canister Vent (CV) solenoid wiring harness connector. Using a DVOM, measure 
resistance between CV solenoid terminals. If resistance is not 48-65 ohms, replace CV solenoid and repeat 
QUICK TEST in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If resistance is 48-65 
ohms, solenoid is okay. If fault is still present, perform TEST HX: EVAPORATIVE EMISSION MONITOR 
& SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. 

EVAP CANISTER PURGE VALVE 

NOTE:

EVAP canister purge valve resistance reading must be taken with engine cooled 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

Turn ignition switch to OFF position. Disconnect EVAP canister purge valve. Using a DVOM, measure 
resistance between EVAP canister purge valve terminals. If resistance is not 30-38 ohms, replace EVAP 
canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST under 
EVAPORATIVE EMISSION SYSTEM TESTS to verify repair. If resistance is 30-38 ohms, EVAP canister 
purge valve is okay. If fault is still present, perform TEST HX: EVAPORATIVE EMISSION MONITOR & 
SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. 

IDLE AIR CONTROL SOLENOID 

Idle Air Control (IAC) solenoid is a by-pass air type. Ensure ignition is off. Disconnect IAC solenoid harness 
connector. Measure resistance between IAC solenoid terminals. Solenoid has an internal diode and resistance 
will be infinite if voltmeter is hooked up incorrectly. If resistance is not 6-13 ohms, replace solenoid. If 
resistance is 6-13 ohms, IAC solenoid is okay. For additional testing and specifications, see TEST KE: IDLE 
AIR CONTROL VALVE under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & 
GASOLINE article. 

INTAKE MANIFOLD RUNNER CONTROL SOLENOID 

See TEST HU: AIR INTAKE SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article for additional Intake Manifold Runner Control (IMRC) testing and specifications. 

INTAKE MANIFOLD SWIRL CONTROL SOLENOID (RANGER 2.3L ONLY) 

See TEST HU: AIR INTAKE SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article for additional Intake Manifold Swirl Control (IMSC) testing and specifications. 

INTAKE MANIFOLD TUNING VALVE SOLENOID 

See TEST HU: AIR INTAKE SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article for additional Intake Manifold Tuning Valve (IMTV) testing and specifications. 

SUPERCHARGER (BOOST) BY-PASS SOLENOID 

Turn ignition off. Disconnect Supercharger By-Pass (SCB) solenoid connector, located on rear of engine (F150) 
or on left front of engine (Mustang). Measure resistance between SCB solenoid terminals. If resistance is not 
68-78 ohms, replace solenoid. If resistance is 68-78 ohms, IAC solenoid is okay. For additional testing and 
specifications, see TEST KJ: SUPERCHARGER BY-PASS CONTROL under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. 

VARIABLE CAM TIMING SOLENOID 

See TEST HK: VARIABLE CAM TIMING under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, 

down.

NOTE:

Idle Air Control (IAC) solenoid may also be referred to as IAC valve.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

FLEX-FUEL & GASOLINE article for additional testing and specifications.

FUEL SYSTEMS 

FUEL DELIVERY 

Fuel Pressure Regulator 

See TEST HC: GASOLINE FUEL DELIVERY SYSTEM under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. 

Fuel Pump Relay 

See COOLING FAN CONTROL, FUEL PUMP & PCM POWER RELAY under RELAYS & 
SOLENOIDS. 

Fuel System Pressure Check 

See FUEL SYSTEM PRESSURE under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 
CARS or BASIC DIAGNOSTIC PROCEDURES - TRUCKS - EXCEPT DIESEL article. 

FUEL CONTROL 

Fuel Injector 

Disconnect fuel injector harness connectors. Using a DVOM, measure resistance between injector terminals. 
See Fig. 7 . If resistance of any injector is not as specified, replace injector. If injector resistance is within 
specification, injector is okay. For additional fuel injector testing and specifications, see TEST HD: MISFIRE 
DETECTION MONITOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & 
GASOLINE article. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

Fig. 7: Fuel System Types, Fuel Injector Resistances & Pressure Specifications 
Courtesy of FORD MOTOR CO. 

IGNITION SYSTEMS 

NOTE:

For additional information and descriptions, see IGNITION SYSTEMS in 
THEORY & OPERATION - CNG, FLEX-FUEL & GASOLINE article.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline