Ford F150 Pickup. Manual — part 1367

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

Flash Electrically Eraseable Programmable Read Only Memory (EEPROM) is contained in an Integrated
Circuit (IC) internal to the PCM. The EEPROM contains the vehicle strategy including calibration information
specific to the vehicle and is capable of being reprogrammed or reflashed repeatedly.

As part of the calibration there is an area referred to as the Vehicle Identification (VID) block. The VID block
must be programmed when replacing the PCM as described under Programming the VID Block for a
Replacement PCM. Failure to perform this procedure may generate fault codes: P1635, P1639, VID Block not
programmed or is corrupt. The VID block in an existing PCM can also be tailored to accommodate various
hardware/parameter changes made to the vehicle since production. Failure to perform this procedure properly
may generate fault code: P1635, Tire/Axle Ratio out of Acceptable Range is one of the main causes for code:
P1639. This is described under Making Changes to the VID Block and also under Making Changes to the PCM
Calibration. The VID block contains many items used by the strategy for a variety of functions. Some of these
items include the VIN number, octane adjust, fuel octane, fuel type, vehicle speed limit, tire size, axle ratio, the
presence of speed control and four wheel drive electronic shift on the fly versus manual shift on the fly. Only
items applicable to vehicle hardware and supported by the VID block will be displayed on the scan tool.

When changing items in the VID block, the strategy will place range limits on certain items such as tire and
axle ratio. The VID block is also limited to the number of times to be reconfigured. When this limit is reached,
the scan tool will display a message indicating the need to flash the PCM again to reset the VID block.

The following procedures use the Worldwide Diagnostic System (WDS) for reprogramming:

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PROGRAMMING VID BLOCK FOR REPLACEMENT PCM

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MAKING CHANGES TO THE VID BLOCK

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MAKING CHANGES TO THE PCM CALIBRATION

Reprogramming can be performed by a local Ford dealer for any non Ford facility. There are other Enhanced
Scan Tools that may have reprogramming capabilities available. Refer to the manufacturers users manual for
details.

Programming VID Block For Replacement PCM

A new PCM will contain the latest strategy and calibration level for a particular vehicle. However, the VID
block will be blank and will need programming. There are 2 procedures available. The first is an automatic data
transfer from the old PCM to the new PCM and the second is manual data entry into the new PCM.

Automatic data transfer will be performed if the old PCM is capable of communicating. This is done by the use
of a scan tool to retrieve data from the old PCM before removing it from the vehicle. The stored data can now
be downloaded to the new PCM after it has been replaced.

2003 Ford Pickup F150

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

Manual data entry must be performed if the old module is damaged and/or incapable of communicating.
Remove and replace the old PCM. Using a compatible Scan Tool select and execute MODULE/PARAMETER
REPROGRAMMING referring to the manufacturers users manual. Important, make certain that all parameters
are included. Failure to properly program Tire Size in revolutions per mile, (rev/mile equals 63,360 divided by
the tire circumference in inches) Axle Ratio, 4x4/4x2, and/or Manual/Electronic shift on the fly (MSOF/ESOF)
may result in codes: P1635, P1639. You may be instructed to contact the AS BUILT data center for the
information needed to manually update the VID block with the scan tool. Contact the center only if the old
PCM cannot be used or the data is corrupt. For Ford Lincoln Mercury technician's, contact your National
Hotline or the Professional Technician Society (PTS) web sight for AS BUILT data. Non Ford technicians, use
the Fed World web site at fedworld.gov. Select AUTO SERVICE INFORMATION and search for
CALIBRATIONS or VEHICLE CALIBRATIONS then specify vehicle manufacturer, model name and model
year as required.

Making Changes To The VID Block

A PCM which is programmed may require changes to be made to certain VID information to accommodate
vehicle hardware. Refer to PCM/MODULE REPROGRAMMING on the scan tool.

Making Changes To The PCM Calibration

At certain times, the entire EEPROM will need to be completely reprogrammed. This is due to changes made to
the strategy or calibration after production or the need to reset the VID block because it has reached its limit.
Refer to PCM/MODULE REPROGRAMMING on the scan tool.

FUEL SYSTEM SAFETY PRECAUTIONS

GASOLINE SYSTEM

Safe Fuel Handling Practices

Fire

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Report all fires to proper authorities.

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Flames from methanol or methanol-gasoline blends can be invisible.

CAUTION: Fuel in fuel system remains under high pressure even when engine is not

running. To avoid injury or fire, release fuel pressure from fuel system
before disconnecting any fuel line. To release pressure from system
perform FUEL SYSTEM PRESSURE RELEASE procedure under FUEL
SYSTEM in appropriate REMOVAL & INSTALLATION article. To avoid
unnecessary fuel spillage and fire hazard, any time fuel lines are
disconnected, ignition switch must be in OFF position unless fuel pump
operation is required for test purposes.

WARNING:

Use care to prevent combustion from fuel spillage. No smoking, open
flames or any kind of arcing.

2003 Ford Pickup F150

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

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Know locations of portable fire extinguishers, fire blankets, fire alarms and eye/wash shower facilities
and learn how to use them.

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Use a "B" or "AFFF" (light water) type fire extinguisher to fight flammable liquid fires.

First Aid

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If gasoline has been swallowed, do not induce vomiting. Seek medical attention immediately!

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If methanol or a methanol/gasoline blend has been swallowed, induce vomiting under the direction of a
physician or Poison Control Center. Seek medical attention immediately!

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When overcome by vapors, if safe, move victim to fresh air. If not breathing, give artificial respiration or
CPR (Cardiopulmonary Resuscitation) as appropriate. Seek medical attention immediately!

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If splashed in eyes, flush with large amounts of water for 15 minutes. Remove contact lenses, if worn.
Seek medical attention.

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If splashed on skin, remove contaminated clothing. Wash skin thoroughly with soap and water.

Health

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All fuels can be harmful or fatal if swallowed.

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Be aware, if fuel is swallowed, onset of serious health effects can be delayed 12 to 24 hours.

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All fuel vapors can be harmful if inhaled.

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All fuels can be harmful if absorbed through skin.

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All fuels are irritating to eyes and respiratory system.

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Some fuels made with gasoline contain benzene which is a cancer causing agent.

Handling

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Use flammable liquid handling precautions.

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Wear chemical goggles and nitrile gloves (additional protective clothing and equipment may be necessary
in some instances).

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Keep flammable liquids in approved, labeled, closed containers.

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Use in well ventilated areas and control vapors. Be aware that vapors are not visible, are heavier than air,
can travel along floor, and will settle in lower areas.

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When transferring flammable liquids, bond receiving container to source and ground source to earth.

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DO NOT smoke or use heat or spark producing equipment near vapors.

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DO NOT eat, smoke or drink where these products are handled, processed or stored.

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Never siphon by mouth.

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Wash hands thoroughly after handling any fuel.

Spills

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Notify proper authorities in the event of any spill you have not been trained to clean up.

2003 Ford Pickup F150

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

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Stop, contain, and clean up small spills with an absorbent material.

Inertia Fuel Shutoff Switch Reset Procedure

Turn ignition off. Check for fuel leaks in engine compartment. If no leak is present, reset IFS switch by pushing
reset button on top of switch. Turn ignition switch to ON position or START position for a few seconds, then to
OFF position again. Again, check for leaking fuel.

NATURAL GAS SYSTEM

Safe Fuel Handling Practices

Fire

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Report all fires to proper authorities.

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Flames from natural gas have a Yellow and/or Blue color.

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Know locations of portable fire extinguisher, fire blankets, and fire alarms and learn how to use them.

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Use an ABC rated/certified fire extinguisher or fire blanket to fight flammable gas fires.

First Aid

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If overcome by vapors, if safe, move victim to fresh air. If not breathing, give artificial respiration or CPR
(cardiopulmonary resuscitation) as appropriate. Seek medical attention immediately.

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For irritated eyes, flush with large amounts of water for 15 minutes. Remove contact lenses, if worn and
seek medical attention.

Health

WARNING:

If you see or smell gasoline at any time other than during fueling, DO NOT
reset Inertia Fuel Shutoff (IFS) switch.

NOTE:

With IFS in CLOSED position, reset button can be depressed an additional 1/16"
against the spring.

WARNING:

Natural gas in fuel system is at high pressure at all times. To avoid injury
or fire, release fuel pressure from fuel system before disassembling any
fuel system component. To release pressure from system, follow
pressure relief procedure. See FUEL SYSTEM VENTING in appropriate
REMOVAL & INSTALLATION article. After performing fuel system
pressure relief procedure, a small amount of pressure 3 psi (21 kPa) will
remain in fuel rail, and high pressure still exists in fuel tanks. Prevent
combustion from escaping fuel; no smoking, open flames or any kind of
arcing.

2003 Ford Pickup F150

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