Ford F150 Pickup. Instruction - part 1353

INTAKE AIR TEMPERATURE SENSOR 

See TEST DA: TEMPERATURE SENSOR TEST (IAT, ECT & EOT) under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Intake Air Temperature (IAT) sensor testing 
procedures and specifications. 

INTAKE AIR TEMPERATURE 2 SENSOR (SC ONLY) 

See TEST DU: INTAKE AIR TEMPERATURE 2 under SYSTEM TESTS in SELF-DIAGNOSTICS - 
CNG, FLEX-FUEL & GASOLINE article for Intake Air Temperature 2 (IAT2) sensor testing procedures and 
specifications. 

KNOCK SENSOR 

See TEST DG: KNOCK SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & 
GASOLINE article for Knock Sensor (KS) testing procedures and specifications. 

MASS AIRFLOW SENSOR 

See TEST DC: MASS AIRFLOW SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, 
FLEX-FUEL & GASOLINE article for Mass Airflow (MAF) sensor testing procedures and specifications. 

OUTPUT SHAFT SPEED SENSOR 

See TEST TJ: OUTPUT SHAFT SPEED SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - 
CNG, FLEX-FUEL & GASOLINE article for Output Shaft Speed (OSS) sensor testing procedures and 
specifications. 

PARK/NEUTRAL POSITION OR CLUTCH PEDAL POSITION SWITCH 

See TEST TA: PARK/NEUTRAL POSITION OR CLUTCH PEDAL POSITION SWITCHES under 
SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for testing procedures 
and specifications. 

RV Cutaway

On Lower Right Of Steering Column

Sable & Taurus

In Right Side Of Luggage 

Compartment. Behind Side Panel

Thunderbird

In Left Side Front Footwell

Windstar

On Right Rear Side Of Vehicle

ZX2

Bottom Of Left "A" Pillar

NOTE:

On some models, IAT sensor is part of Mass Airflow (MAF) sensor assembly. If 
all 6 terminals of MAF sensor connector are being used, IAT sensor is integral 
to MAF sensor. See WIRING DIAGRAMS .

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

POWER STEERING PRESSURE SENSOR

See TEST DT: POWER STEERING PRESSURE SENSOR under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Power Steering Pressure (PSP) sensor testing 
procedures and specifications. 

POWER STEERING PRESSURE SWITCH 

See TEST FF: POWER STEERING PRESSURE SWITCH under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for testing procedures and specifications. 

REVERSE SWITCH 

See TEST TH: REVERSE SWITCH under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL 
& GASOLINE article for testing procedures and specifications. 

THERMAL MANIFOLD ABSOLUTE PRESSURE SENSOR 

See TEST DM: MANIFOLD ABSOLUTE PRESSURE SENSOR & THERMAL MANIFOLD 
ABSOLUTE PRESSURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL 
& GASOLINE article for Thermal Manifold Absolute Pressure (TMAP) sensor testing procedures and 
specifications. 

THROTTLE POSITION SENSOR 

For electronic throttle control system, see TEST DV: ELECTRONIC THROTTLE CONTROL 
THROTTLE POSITION SENSOR, THROTTLE CONTROL MOTOR under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Throttle Position (TP) sensor testing 
procedures and specifications. 

For all others, see TEST DH: THROTTLE POSITION SENSOR under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Throttle Position (TP) sensor testing 
procedures and specifications. 

TRANSFER CASE SPEED SENSOR 

See TEST DP: VEHICLE SPEED SENSOR/TRANSFER CASE SPEED SENSOR under SYSTEM TESTS 
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Transfer Case Speed Sensor (TCSS) 
testing procedures and specifications. 

TRANSMISSION CONTROL SWITCH 

See TEST TB: TRANSMISSION CONTROL SWITCH/TRANSMISSION CONTROL INDICATOR 
LAMP under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for 
testing procedures and specifications. 

VEHICLE SPEED SENSOR 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

See TEST DP: VEHICLE SPEED SENSOR/TRANSFER CASE SPEED SENSOR under SYSTEM TESTS 
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Vehicle Speed Sensor (VSS) testing 
procedures and specifications. 

RELAYS & SOLENOIDS 

AIR INJECTION BY-PASS SOLENOID 

See TEST HM: SECONDARY AIR INJECTION SYSTEM under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. 

AIR INJECTION DIVERTER SOLENOID 

See TEST HM: SECONDARY AIR INJECTION SYSTEM under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. 

CANISTER VENT SOLENOID 

See FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS. 

COOLING FAN CONTROL, FUEL PUMP & PCM POWER RELAY 

Turn ignition switch to OFF position. On ISO micro fuel pump relay terminals that are numbered 1-5, measure 
resistance between relay terminal No. 1 and all other relay terminals. Resistance should be 40-120 ohms 
between terminals No. 1 and 2 and more than 10 k/ohms between terminal No. 1 and all other relay terminals. 
On ISO mini fuel pump relay terminals that are numbered 30, 85, 86, 87 and 87A, measure resistance between 
relay terminal No. 85 and all other relay terminals. Resistance should be 40-120 ohms between terminals No. 85 
and 86 and more than 10 k/ohms between terminal No. 85 and other relay terminals. On both relays, if 
resistance is not as specified replace relay. If resistance is as specified, relay is okay. Check associated circuits 
for possible open or shorts. 

NOTE:

On Mustang and ZX2, a Constant Control Relay Module (CCRM) is used. See 
TEST X: CONSTANT CONTROL RELAY MODULE under SYSTEM TESTS in 
SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article for Constant 
Control Relay Module (CCRM) testing procedures.

NOTE:

Two different types of relay can be used. An ISO micro relay (relay terminals are 
numbered 1-5), or an ISO mini relay (terminals are numbered 30, 85, 86, 87 and 
87A). On ISO micro relays, relay coil terminals are No. 1 and 2. On ISO mini 
relays, relay coil terminals are No. 85 and 86. See Fig. 5 or Fig. 6 .

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

Fig. 5: Identifying ISO Mini Relay Terminals 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline