Ford F150 Pickup. Instruction - part 1399

SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

2) Check SCP Link To PCM For Open Or Short To Ground 
 
Ensure ignition is off. Ensure PCM and compuvalve are disconnected. Ensure bi-fuel relay module power 
supply harness connector C495 is disconnected. Perform the following: 

z

Using DVOM, measure resistance of SCP (-) circuit between compuvalve harness connector C1294 
terminal No. 16 (White wire) and PCM harness connector C175 terminal No. 15 (Pink/Light Blue 
wire). Fig. 7 and Fig. 30 .  

z

Using DVOM, measure resistance of SCP (+) circuit between compuvalve harness connector 
C1294 terminal No. 14 (White wire) and PCM harness connector C175 terminal No. 16 
(Tan/Orange wire). See Fig. 7 and Fig. 30 .  

If all resistances are less than 5 ohms between connector C1294 and PCM, go to next step. If any 
resistance measurement is 5 ohms or more between connector C1294 and PCM, repair open in affected 
SCP circuit. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in 
ELECTRICAL. 

3) Check PCM Configuration 
 
Check PCM configuration. See POWERTRAIN CONTROL MODULE under PROGRAMMING. If 
PCM is not configured correctly, perform FLASH VEHICLE IDENTIFICATION BLOCK 
PROCEDURE under POWERTRAIN CONTROL MODULE under PROGRAMMING. If PCM is 
unable to be reconfigured, replace PCM as necessary. If PCM is configured correctly, perform 
COMPUVALVE CHECK under QUICK TEST. If fault still exists, replace compuvalve.  

TEST UC: SIGNAL LINK FAULT 

Diagnostic Aids 

Enter this test only when all steps under QUICK TEST have been successfully completed and engine still does 
not start or if directed here from another test or chart. Powertrain Control Module (PCM) and Alternative Fuel 
Control Module (AFCM) transfer data through SCP network. DTC U2015 (signal link fault - non SCP) is set 
when communication between compuvalve and Alternative Fuel Control Module (AFCM) has been interrupted. 
Possible cause for this fault is the compuvalve. 

Testing 

Check AFCM PID 
 
Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, 
access AFCM and select an active PID. If communication is not possible with AFCM, perform 
COMPUVALVE CHECK under QUICK TEST. If fault still exists, replace compuvalve. If 
communication is possible with AFCM, system is operating correctly at this time. Clear DTCs. Road test 
vehicle. Repeat AFCM CONTINUOUS MEMORY SELF-TEST . If DTC is set again, perform 
intermittent testing. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - BI-FUEL - 
GASOLINE/LPG article.  

 

2003 Ford Pickup F150 

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

  

INTRODUCTION 

Before proceeding with diagnostics, check for applicable Technical Service Bulletins (TSBs). If there are no 
applicable TSBs, perform QUICK TEST to identify Diagnostic Trouble Codes (DTCs). If DTCs exist, see 
DIAGNOSTIC TROUBLE CODE DEFINITIONS for diagnostic procedures. 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. 

NOTE:

This article covers flex-fuel, gasoline & CNG vehicles. For Bi-Fuel (LPG and 
gasoline, or CNG and gasoline) vehicles, go to appropriate SELF-DIAGNOSTICS 
- BI-FUEL article.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

SELF-DIAGNOSTIC SYSTEM 

DIAGNOSTIC FORMATS 

QUICK TEST and SYSTEM TESTS are diagnostic formats used to test and service EEC-V system. QUICK 
TEST allows technician to identify concerns and retrieve Diagnostic Trouble Codes (DTC). SYSTEM TESTS 
are used to check circuits, sensors and actuators. 

Before starting any SYSTEM TEST, follow all steps under QUICK TEST to determine appropriate system test 
to perform. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-V 
system is okay. 

DIAGNOSTIC TROUBLE CODES 

During QUICK TEST, 3 types of Diagnostic Trouble Codes (DTCs) are retrieved and diagnosis must be 
performed in the following order: Key On Engine Off (KOEO), Key On Engine Running (KOER) and 
Continuous Memory DTCs. See QUICK TEST for self-test procedures. DTCs may be cleared from PCM 
memory after DTCs have been recorded or fault has been repaired. See CLEARING CODES under SELF-
DIAGNOSTIC SYSTEM. If fault is still present after clearing DTCs, fault will reset. 

KOEO & KOER Self-Tests 

These DTCs indicate faults are present at time of testing. A hard fault may cause Malfunction Indicator Light 
(MIL) to illuminate and remain illuminated until fault is repaired. The MIL is located on instrument cluster and 
may be labeled SERVICE ENGINE SOON or CHECK ENGINE. If KOEO or KOER DTCs are retrieved 
during KOEO ON-DEMAND SELF-TEST or KOER ON-DEMAND SELF-TEST, see DIAGNOSTIC 
TROUBLE CODE DEFINITIONS to find appropriate system test to perform. 

Continuous Memory Codes 

Continuous Memory DTCs are retrieved after performing KOER ON-DEMAND SELF-TEST. Unlike KOEO 
or KOER self-tests, which can only be activated on-demand, Continuous Memory self-test is always active. A 
fault may or may not be present at time of checking for Continuous Memory DTCs. This self-test is helpful in 
diagnosing intermittent concerns. 

After noting and/or repairing fault, clear DTCs from memory. See CLEARING CODES under SELF-
DIAGNOSTIC SYSTEM. Intermittent faults may be caused by a sensor, connector or wiring-related concern. 
See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - CNG, FLEX-FUEL & GASOLINE 
article. 

RETRIEVING CODES 

NOTE:

Continuous Memory DTCs should be recorded when retrieved. These DTCs may 
be used to identify intermittent concerns that exist after all KOEO and KOER 
DTCs have been repaired. Some Continuous Memory DTC faults may not be 
valid after KOEO and KOER DTCs are serviced.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

Fault codes are retrieved from EEC-V system through Data Link Connector (DLC). See Fig. 1. Self-diagnostic 
test procedures are for use with Rotunda Worldwide Diagnostic System (WDS), New Generation Star (NGS) 
scan tool or equivalent. If a generic scan tool is used, ensure scan tool is certified to OBD-II standard. 

DATA LINK CONNECTOR LOCATIONS 

Fig. 1: Identifying Data Link Connector Terminals 
Courtesy of FORD MOTOR CO. 

READING CODES 

KOEO & KOER On-Demand Self-Test Codes 

Record DTCs in order received. These DTCs indicate current faults in system and should be serviced in order of 
appearance. See DIAGNOSTIC TROUBLE CODE DEFINITIONS to identify appropriate system test to 
perform. 

Pass Codes 

SYSTEM PASS indicates no DTCs were recorded in that portion of test. If SYSTEM PASS is not retrieved in 
KOEO ON-DEMAND SELF-TEST, DTCs retrieved during KOER ON-DEMAND SELF-TEST may not be 
valid. 

Continuous Memory Codes 

These DTCs result from information stored by PCM during continuous self-test monitoring. Use these DTCs 

Application

Location

All Models

Below Instrument Panel, Right Of Steering Wheel

NOTE:

If self-test will not activate or TOOL COMMUNICATION ERROR is received, go to 
TEST QA under SYSTEM TESTS.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline