Ford F150 Pickup. Instruction - part 1351

2003 ENGINE PERFORMANCE

System & Component Testing - Gasoline 

INTRODUCTION 

Before testing separate components or systems, perform QUICK TEST procedures in SELF-DIAGNOSTICS - 
CNG, FLEX-FUEL & GASOLINE article. If no DTCs are present or only pass codes are found during self-
diagnostics and symptom is present, proceed to TROUBLE SHOOTING - NO CODES - CNG, FLEX-
FUEL & GASOLINE article for diagnosis by symptom. If sent here from TROUBLE SHOOTING - NO 
CODES article, proceed with diagnosis in this article. 

In many cases a circuit that is open, or shorted to ground or power can be at fault. Component replacement is 
only suggested after testing and passing circuits and control devices. A component test may direct you to a 
system test in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article to help avoid replacement of 
a good component. If the component can be tested properly on its own, it will be included here. 

AIR INDUCTION SYSTEMS 

INTAKE AIR CONTROL 

Intake Manifold Runner Control Solenoid 

See INTAKE MANIFOLD RUNNER CONTROL SOLENOID under RELAYS & SOLENOIDS. 

Intake Manifold Swirl Control Solenoid 

See INTAKE MANIFOLD SWIRL CONTROL SOLENOID under RELAYS & SOLENOIDS. 

Intake Manifold Tuning Valve Solenoid 

See INTAKE MANIFOLD TUNING VALVE SOLENOID under RELAYS & SOLENOIDS. 

COMPUTERIZED ENGINE CONTROLS 

POWERTRAIN CONTROL MODULE 

NOTE:

References to Econoline include Cutaway and RV Cutaway. References to F250-
550 Super Duty Pickup include Cab & Chassis.

NOTE:

Testing individual components does not isolate shorted or open circuits. 
Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 
10-megohm input impedance, unless stated otherwise in test procedure. Use 
ohmmeter to isolate shorted or open wiring harness. For identification of 
circuits and terminals referenced in test procedures, see WIRING DIAGRAMS .

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

Ground Circuits 

1. Turn ignition off. Locate Powertrain Control Module (PCM). See POWERTRAIN CONTROL 

MODULE LOCATION table. Using a DVOM, check continuity between ground and PCM connector 
terminals. See IDENTIFYING PCM GROUND TERMINALS table. See Fig. 1 -Fig. 4 . If continuity 
does not exist, repair open ground circuit as necessary. If continuity exists, go to next step. 

POWERTRAIN CONTROL MODULE LOCATION 

IDENTIFYING PCM GROUND TERMINALS 

Application

Location

Aviator, Blackwood, Expedition, Explorer, Explorer Sport, 
Explorer Sport Trac, F150 Pickup, Mountaineer & Navigator

Right Rear Of Engine Compartment,

Mounted On Cowl

Escape, Ranger & Town Car

Center Of Engine Compartment,

Mounted On Cowl

LS, Sable, Taurus, Thunderbird & Windstar

Right Rear Of Engine Compartment,

Mounted On Cowl

Crown Victoria, Grand Marquis & Marauder

Behind Left Kick Panel, Near

Instrument Panel

Econoline

Left Rear Of Engine Compartment,

Near Brake Master Cylinder

Excursion & F250-550

Behind Left Side Of Instrument Panel,

Near Brake Pedal

Focus & Mustang

Behind Right Kick Panel

ZX2

Center Of Instrument Panel, Below

Center Console

Application

PCM Ground Terminal No.

Aviator & Thunderbird

B24, B25, B26, B27 & B43

Crown Victoria, Grand Marquis, Marauder, Mustang (4.6L) & Town 
Car

3, 24, 25, 51, 76 & 103

Econoline

4.2L

24, 25, 51, 76, 77 & 103

4.6L & 5.4L Gas

3, 24, 25, 51, 76, 77 & 103

5.4L NGV

3, 24, 25, 51, 77 & 103

6.8L

3, 23, 24, 25, 51, 76, 77 &

103

Escape

3, 24, 25, 51, 76 & 103

Excursion & F250-F550 (5.4L & 6.8L)

3, 23, 24, 25, 51, 76, 77 & 103

Expedition & Navigator

B1, B10, B11 & B23

Explorer, LS & Mountaineer

A24, A25, A26, A27 & A43

Explorer Sport, Explorer Sport Trac & F150 Pickup (4.2L)

24, 25, 51, 76, 77 & 103

F150 Pickup (Lightning 5.4L SC) & Mustang (4.6L)

3, 25, 51, 76 & 103

Blackwood & F150 Pickup (4.6L & 5.4L, & 5.4L NGV)

3, 25, 51, 76 & 103

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

2. Touch DVOM negative lead to a good ground. With vehicle running, use DVOM positive lead to 

backprobe each ground terminal. DVOM should indicate less than one volt. If reading is more than one 
volt, check for open, corrosion or loose connection on ground circuit.  

Power Circuits 

Turn ignition off. Using a DVOM, check for battery voltage between ground and B+ circuit at PCM terminal 
No. 55 (104-pin PCM), terminal No. B40 (122-pin PCM), terminal No. B45 (150-pin PCM - Focus 2.3L), or 
terminal No. A44 or B44 (150-pin PCM - all others). See Fig. 1 -Fig. 4 . Turn ignition switch to START or 
RUN position. Check for battery voltage between ground and specified VPWR circuit at PCM harness 
connector. See PCM VPWR CIRCUIT TERMINAL IDENTIFICATION table. If battery voltage is not 
present, check for an open in VPWR circuit between PCM and PCM power relay. For additional testing 
procedures, see TEST B: EEC-V POWER RELAY under SYSTEM TESTS in SELF-DIAGNOSTICS - 
CNG, FLEX-FUEL & GASOLINE article. 

PCM VPWR CIRCUIT TERMINAL IDENTIFICATION 

Focus (2.0L)

DURATEC

23, 24, 25, 51, 77 & 103

SPI

24, 25, 51, 77 & 103

ZETEC

24, 25, 51, 76, 77 & 103

Focus (2.3L PZEV)

47B, 48B & 49B

Mustang (3.8L)

3, 51, 76, 77 & 103

Ranger, Sable & Taurus

24, 25, 51, 76, 77 & 103

Windstar

3, 24, 51, 76 & 103

ZX2

24, 33, 51, 77 & 103

Application

(1)

 PCM Terminal No.

Models With 122-Pin PCM

B34 & B46

Focus 2.3L With 150-Pin PCM

B35 & B36

All Other Models With 150-Pin PCM

A32 & A33, Or B32 & B33

All Other Models

71

(1)

For PCM harness connector terminal identification, refer to illustration. See Fig. 1 -Fig. 4 .

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline

  

Fig. 1: Identifying PCM Harness Connector Terminals (104-Pin) 
Courtesy of FORD MOTOR CO. 

Fig. 2: Identifying PCM Harness Connector Terminals (122-Pin) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE System & Component Testing - Gasoline