Ford F150 Pickup. Instruction - part 1383

Fig. 2: Identifying New Generation Star Tester
Courtesy of FORD MOTOR CO.

AFCM CONTINUOUS MEMORY SELF-TEST

Perform the following:

Turn ignition on or start engine if necessary.

NOTE:

Always retrieve Powertrain Control Module (PCM) DTCs before Alternate Fuel
Control Module (AFCM) DTCs. KOEO and KOER self-tests cannot be performed
in ALT fuel mode.

2003 Ford Pickup F150

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

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 START.

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.

If vehicle is a no-start in ALT mode, start engine in GAS mode. Drive vehicle for about 10 minutes in GAS
mode, then 10 minutes in ALT mode until it reaches normal operating temperature. Check for Continuous
Memory DTCs. If no Continuous Memory DTCs exists and engine will not restart in ALT fuel mode, see NO
START/NORMAL CRANK - ALT FUEL MODE under SYMPTOMS in TROUBLE SHOOTING - NO
CODES - BI-FUEL - GASOLINE/LPG article. If no Continuous Memory DTCs exists and engine will not start
in GAS mode, see NO START/NORMAL CRANK - GASOLINE MODE under SYMPTOMS in
TROUBLE SHOOTING - NO CODES - BI-FUEL - GASOLINE/LPG article. If any Continuous Memory
DTCs exist, clear DTCs and repeat Continuous Memory self-test to confirm hard fault DTCs exist. If no
Continuous Memory DTCs are repeated, see SYMPTOMS in TROUBLE SHOOTING - NO CODES - BI-
FUEL - GASOLINE/LPG article. If Continuous Memory DTCs are repeated, perform appropriate system test.
See DIAGNOSTIC TROUBLE CODE DEFINITIONS . After test is complete, cycle ignition switch before
performing other self-tests or driving vehicle.

COMPUVALVE CHECK

If diagnostic results from SYSTEM TESTS indicate a suspect compuvalve, complete the following before
replacing compuvalve:

Verify ALT fuel switch status. See THEORY & OPERATION - BI-FUEL - GASOLINE/LPG article.

Ensure proper communication ability with EEC system between PCM and compuvalve.

Confirm MAP line is not loose, kinked, or restricted.

Check harness and connection integrity.

Ensure EEC system calibration is for current Bi-Fuel code.

Verify battery voltage to compuvalve.

Ensure adequate fuel level at tank sending unit (LPG only) to permit engine operation in ALT fuel mode.

Confirm that fuel filter (LPG only) is not installed backwards.

Verify base vehicle does not have a secondary ignition operation concern.

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/LPG

Check for any applicable Technical Service Bulletins.

Common causes of compuvalve misdiagnosis are as follows:

MAP elbow loose.

High FAP from vaporizer malfunction.

Low FAP due to lockoff fault.

Incorrect interpretation of DTCs.

Misfire due to faulty "O" rings.

Compuvalve replaced without checking HPS circuit for high resistance.

ADDITIONAL SYSTEM FUNCTIONS

PARAMETER IDENTIFICATION DATA MONITOR PROCEDURE

Description

Parameter Identification Data (PID) mode allows access to certain data values, analog and digital inputs and
outputs, calculated values, and system status information. The Ford specific PID list can be accessed by using
New Generation Star (NGS) tester. When accessing PIDs from the PID list, the values are continuously
updated. For additional PID information, see appropriate PIN VOLTAGE/PID VALUE CHARTS article.

Accessing Ford Specific OBD-II PIDs

Turn ignition off. Ensure test equipment is properly attached. Program NGS tester using the following steps:

Turn ignition switch to ON position or start engine and allow to idle.

Select VEHICLE & ENGINE SELECTION menu.

Select NEW VEHICLE, YEAR & MODEL.

CAUTION: Before replacing the compuvalve, always be sure the battery and the Red

connector C495 are disconnected when removing or installing a
compuvalve. The reason for this procedure is that when reconnecting the
compuvalve connector to the compuvalve it is possible to obtain a partial
insertion of the connector into the compuvalve with the signal pins offset
one pair of pins laterally. Although full insertion is not possible and the
misalignment will be immediately noticed and corrected by the technician,
the partial insertion brings into contact a 12-volt power socket with a 5-
volt power pin. If the battery and the red connector C495 have not been
disconnected this partial insertion will result in a permanently inoperable
compuvalve.

NOTE:

Additional diagnostic system features are available to help diagnose driveability
problems and service EEC-V systems.

2003 Ford Pickup F150

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

Select DIAGNOSTIC DATA LINK.

Select AFCM-ALTERNATE FUEL CTRL MODULE (AFCM supports similar DTCs and PIDs as PCM,
but may have an entirely different meaning).

Select PID/DATA MONITOR AND RECORD.

Select PIDs and press trigger on NGS tester.

Press START to begin monitoring. If PID value is not as specified, perform appropriate SYSTEM TEST.

PROGRAMMING

POWERTRAIN CONTROL MODULE RESET

Description

All OBD-II scan tools support Powertrain Control Module (PCM) reset. The PCM Reset allows the scan tool to
command the PCM to clear all emission-related diagnostic information. When resetting the PCM, a DTC P1000
will be stored in the PCM until all the OBD-II system monitors or components have been tested to satisfy a
drive cycle, without any other faults occurring. See DRIVE CYCLES .

The following events occur when a PCM reset is performed:

Clears the number of Diagnostic Trouble Codes (DTCs).

Clears the DTCs.

Clears the freeze frame data.

Clears diagnostic monitoring test results.

Resets status of the OBD-II system monitors.

Sets DTC P1000.

Resetting Keep Alive Memory (KAM)

Resetting Keep Alive Memory will return PCM memory to its default setting. Adaptive learning contents such
as idle speed, refueling event, and fuel trim are included. A PCM Reset (described above) is also part of a KAM
Reset. Both can be useful in post repair retest.

After Keep Alive Memory has been reset, the vehicle may exhibit certain driveability concerns. It will be
necessary to drive the vehicle to allow the PCM to relearn values for optimum driveability and performance.

If an error message is received or the scan tool does not support this function, disconnecting the battery ground
cable for a minimum of 5 minutes may be used as an alternative procedure.

FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY (FLASH
EEPROM)

Description

2003 Ford Pickup F150

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

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