Ford F150 Pickup. Instruction - part 1392

Fig. 33: Identifying PCM Connector Circuit Functions (3 Of 5) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - Bi-Fuel - Gasoline/LPG

  

Fig. 34: Identifying PCM Connector Circuit Functions (4 Of 5) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - Bi-Fuel - Gasoline/LPG

  

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - Bi-Fuel - Gasoline/LPG

  

Fig. 35: Identifying PCM Connector Circuit Functions (5 Of 5)
Courtesy of FORD MOTOR CO. 

CONNECTOR LOCATIONS 

CONNECTOR LOCATIONS 

SYSTEM TESTS 

HOW TO USE SYSTEM TESTS 

1. Ensure all non-EEC related faults found while performing basic diagnostic procedures in BASIC 

DIAGNOSTIC PROCEDURES - TRUCKS - EXCEPT DIESEL article have been corrected. Follow 
each test step in order until fault is found. DO NOT replace any part unless directed to do so. When more 
than one code is retrieved, start with first code displayed.  

2. System tests ensure electrical circuits are okay before sensors or other components are replaced. Always 

test circuits for continuity between sensor and PCM. Test all circuits for short to power, opens or short to 
ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with ignition 
on or as specified in system test.  

3. If measuring voltage or resistance at PCM, always backprobe PCM connector. To identify PCM 

Connector No./Terminal Count

Location

C133/42

Right Rear Side Of Engine Compartment

C139/16

Right Rear Side Of Engine Compartment

C406/8

Right Rear Side Of Engine Compartment

C410/10

Right Rear Side Of Engine Compartment

C421/10

Right Rear Side Of Engine Compartment

C422/10

Right Rear Side Of Engine Compartment

C431/2

Right Rear Side Of Engine Compartment

C432/8

Right Rear Side Of Engine Compartment

C463/4

Center Of Body, Near Fuel Tank

C495/3

Left Rear Side Of Engine Compartment

C1289/4

Left Rear Side Of Engine Compartment

C1294/64

Right Rear Side Of Engine Compartment

C1297/8

Right Rear Side Of Engine Compartment

C4001/2

Left Rear Side Of Engine Compartment

C4002/6

Left Rear Side Of Engine Compartment

C4013/3

Behind Right Side Instrument Panel

C4125/6

Underbody, Rear Of Vehicle

C4130/2

Underbody, Rear Of Vehicle

C4131/4

Underbody, Rear Of Vehicle

NOTE:

Alternate Fuel Control Module (AFCM) is part of compuvalve. Tank select relay 
may also be referred to as LPG sender No. 2 relay.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - Bi-Fuel - Gasoline/LPG