Ford F150 Pickup. Instruction - part 1365

2003 ENGINE PERFORMANCE

Self-Diagnostics - Bi-Fuel - Gasoline/CNG

INTRODUCTION

This article contains Bi-Fuel system Continuous Memory DTC, circuit and component diagnostics only. For
diagnostic information not included within this article, see SELF-DIAGNOSTICS - CNG, FLEX-FUEL &
GASOLINE article. If no DTCs are present or only pass codes are found during self-diagnostics, proceed to
TROUBLE SHOOTING - NO CODES - BI-FUEL - GASOLINE/CNG article for diagnosis by symptom. If
symptom tests check okay, perform all basic diagnostic procedures in BASIC DIAGNOSTIC PROCEDURES
- TRUCKS - EXCEPT DIESEL article.

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 faults 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 DTC may be retrieved: Key On Engine Off (KOEO), Key On Engine
Running (KOER) and Continuous Memory DTCs. See QUICK TEST for self-test procedures. DTCs may be
set in PCM and/or Alternate Fuel Control Module (AFCM). Only Continuous Memory DTCs are available from
AFCM. DTCs may be cleared from memory after DTCs have been recorded or fault has been repaired. See
CLEARING CODES . If fault still exists after clearing DTCs, DTC will reset.

KOEO & KOER Diagnostic Trouble Codes

KOEO and KOER DTCs indicates faults exist at time of testing and may turn on the Malfunction Indicator
Light (MIL). The MIL is located on instrument cluster and may be labeled SERVICE ENGINE SOON or
CHECK ENGINE. For additional information on KOEO and KOER DTCs, see DIAGNOSTIC TROUBLE
CODE DEFINITIONS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. If KOEO or
KOER DTCs are retrieved during KOEO ON-DEMAND SELF-TEST or KOER ON-DEMAND SELF-TEST,
see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL &
GASOLINE article.

Continuous Memory Diagnostic Trouble Codes

Continuous Memory DTC are retrieved after performing KOER ON-DEMAND SELF-TEST. Unlike KOEO or

2003 Ford Pickup F150

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

2003 Ford Pickup F150

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

KOER self-tests, which can only be activated On-Demand, Continuous Memory self-test is always active. A
fault may or may not exist at time of checking for Continuous Memory DTCs. This self-test is helpful in
diagnosing intermittent faults.

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

RETRIEVING DIAGNOSTIC TROUBLE CODES

DTCs are retrieved from EEC-V system through Data Link Connector (DLC), located below instrument panel,
right of steering wheel. See Fig. 6 . 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. A generic scan tool may not be capable of performing all
necessary test functions. To retrieve AFCM Continuous Memory DTCs, see AFCM CONTINUOUS
MEMORY SELF-TEST .

READING DIAGNOSTIC TROUBLE CODES

KOEO & KOER Self-Test Codes

Record DTCs in order received. These DTCs indicate current faults in system and should be serviced in order of
appearance. If KOEO or KOER DTCs are retrieved, see DIAGNOSTIC TROUBLE CODE DEFINITIONS
in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article 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 self-test, DTCs retrieved during KOER self-test may not be valid.

NOTE:

Continuous Memory DTCs should be recorded when retrieved. These DTCs may
be used to identify intermittent faults 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.

NOTE:

Retrieving DTC from PCM must be performed first. Alternate Fuel Control
Module (AFCM) Continuous Memory DTCs are retrieved second.

NOTE:

If self-test will not activate or TOOL COMMUNICATION ERROR is received, see
TEST QA: UNABLE TO ACTIVATE SELF-TEST/SCP COMMUNICATION ERROR
OR/DTC NOT LISTED under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG,
FLEX-FUEL & GASOLINE article.

NOTE:

KOER and KOEO self-tests cannot be performed in ALT fuel mode.

2003 Ford Pickup F150

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

AFCM Continuous Memory Self-Test Codes

Continuous Memory self-test DTCs result from information stored by PCM during continuous self-test
monitoring. Use these DTCs for diagnosis only when KOEO self-test and KOER self-test result in SYSTEM
PASS and all steps under QUICK TEST are successfully completed. These DTCs indicate faults previously
recorded. To retrieve AFCM Continuous Memory DTCs, see AFCM CONTINUOUS MEMORY SELF-
TEST .

CLEARING DIAGNOSTIC TROUBLE CODES

Alternate Fuel Control Module

Perform the following:

Turn ignition off. Ensure proper memory (EEPROM) card is inserted into NGS tester. Connect scan tool
to Data Link Connector (DLC).

Turn ignition on or start engine if necessary.

Select VEHICLE & ENGINE SELECTION.

Select NEW VEHICLE YEAR & MODEL.

Select DIAGNOSTIC DATA LINK.

Select AFCM - ALTERNATE FUEL CTRL MODULE.

Select DIAGNOSTIC TEST MODES.

Select RETRIEVE/CLEAR CONTINUOUS DTCs.

Select CLEAR.

Record DTCs and perform appropriate system test. See DIAGNOSTIC TROUBLE CODE
DEFINITIONS . To disconnect scan tool, turn ignition off and disconnect scan tool from DLC and
power supply.

PCM Reset

After a PCM reset procedure has been performed, the following conditions will be met:

All DTCs will be cleared from PCM memory.

All freeze frame data will be cleared from PCM memory.

Diagnostic monitoring results will be cleared from PCM memory.

CAUTION: DO NOT disconnect vehicle battery to clear DTCs. This will erase

operating information from Keep-Alive Memory (KAM). To clear KAM, see
RESETTING KEEP-ALIVE MEMORY (KAM) .

NOTE:

The AFCM supports some DTCs and PIDs which appear similar to PCM,
but may have an entirely different meaning.

2003 Ford Pickup F150

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

OBD-II system monitor status will reset.

DTC P1000 will be set in PCM memory until all OBD-II system monitors or components have been
tested to satisfy OBD-II drive cycle without any faults occurring. To clear DTC P1000, perform OBD-II
DRIVE CYCLE. See DRIVE CYCLES .

To perform PCM reset using scan tool, follow scan tool manufacturer's operating instructions. If after clearing
DTCs a fault has not been corrected or fault still exists, hard code will immediately be reset in PCM memory.

PCM Resetting Keep-Alive Memory (KAM)

1. Resetting KAM will return PCM memory to its default setting. If not using a scan tool, disconnect

negative battery terminal for a minimum for 5 minutes then go to next step. If using New Generation Star
(NGS) tester, turn ignition switch to ON position. Select ACTIVE COMMAND MODES, then RESET
KEEP ALIVE MEMORY. Go to next step.

2. After KAM has been reset, engine must idle for 15 minutes to learn new idle air trim values. Idle quality

will improve as strategy adapts. Adaptation occurs in 4 separate modes with engine idling, transmission
selector and A/C in specified position. See IDLE AIR TRIM LEARNING MODES table.

IDLE AIR TRIM LEARNING MODES

COMPONENT LOCATIONS

Powertrain Control Module

PCM is located on right rear of engine compartment.

Alternate Fuel Control Module

AFCM is located in right front of engine compartment.

QUICK TEST

CAUTION: When battery is disconnected, vehicle computer may lose memory data.

Driveability problems may exist until computer systems have completed a
relearn cycle. See COMPUTER RELEARN PROCEDURES article in
GENERAL INFORMATION before disconnecting the battery.

Transmission Gear Selector Position

A/C Mode

Neutral

Off

Drive

Off

NOTE:

If a fault is not indicated after performing QUICK TEST, vehicle may have a non-
electronic related failure. See SYMPTOM DIAGNOSIS under SYMPTOMS in

2003 Ford Pickup F150

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

Content .. 1363 1364 1365 1366 ..