Ford F150 Pickup. Manual — part 1407

3. Input signal to PCM is then used to calculate time between CKP edges and also crankshaft rotational

velocity and acceleration. By comparing accelerations of each cylinder event, power loss of each cylinder
is determined. When power loss of a particular cylinder is sufficiently less than a calibrated value and
other criteria is met, then suspect cylinder is determined to have misfired.

4. Misfire types are as follows:

Misfire Type A

Upon detection of a Misfire Type A (200 revolutions) which would cause catalyst damage, MIL
will blink once per second during actual misfire, and a DTC will be stored.

Misfire Type B

Upon detection of a Misfire Type B (1000 revolutions) which will exceed emissions threshold or
cause a vehicle to fail an inspection and maintenance tailpipe emissions test, MIL will illuminate
and a DTC will be stored.

The DTC associated with multiple cylinder misfire for a Type A or Type B misfire is DTC P0300. DTCs
associated with an individual cylinder misfire for a Type A or Type B misfire are; DTCs P0301, P0302,
P0303, P0304, P0305, P0306, P0307, P0308, P0309 and P0310.

SECONDARY AIR INJECTION SYSTEM MONITOR - ELECTRIC SECONDARY AIR INJECTION
PUMP SYSTEM

Secondary Air Injection (AIR) system monitor is an on-board strategy designed to monitor proper function of
secondary air injection system. AIR monitor for electric secondary air injection pump system consists of 2
monitor circuits: an AIR circuit to diagnose concerns with primary circuit side of Solid State Relay (SSR), and
an AIR Monitor circuit to diagnose concerns with secondary circuit side of SSR. A functional check is also
performed that tests ability of AIR system to inject air into exhaust. Functional check relies upon HO2S sensor
feedback to determine presence of air flow. The monitor is enabled during AIR system operation and only after
certain base engine conditions are first satisfied. Input is required from ECT, IAT, and CKP sensors and HO2S
monitor test must also have passed without a fault detection to enable AIR monitor. AIR monitor is also
activated during KOER self-test.

1. The AIR circuit is normally held high through AIR bypass solenoid and SSR when output driver is off.

Therefore a low AIR circuit indicates a driver is always on and a high circuit indicates an open in PCM.
DTC P0412 is associated with this test.

2. The AIR Monitor circuit is held low by resistance path through AIR pump when pump is off. If AIR

monitor circuit is high, there is either an open circuit to PCM from pump, or there is power supplied to
AIR Pump. If AIR monitor is low when pump is commanded ON, there is either an open circuit from
SSR or SSR has failed to supply power to pump. DTCs P1413 and P1414 are associated with this test.

3. The functional check may be done in 2 parts: at start-up when AIR pump is normally commanded ON, or

during a hot idle if start-up test was not able to be performed. The flow test relies upon HO2S to detect
presence of additional air in exhaust when introduced by secondary air injection system. DTC P0411 is
associated with this test.

4. MIL is activated after one of the above tests fail on 2 consecutive drive cycles.

2003 Ford Pickup F150

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

THERMOSTAT MONITOR

Thermostat Monitor is designed to verify proper thermostat operation. This monitor only applies to certain
applications beginning with the 2000 model year and replaces "Insufficient temperature for closed-loop
test" (DTC P0125). This monitor will be executed once per drive cycle and has a monitor run duration of 300-
800 seconds. If a malfunction is indicated by thermostat monitor a DTC P0125 will be set and MIL will be
illuminated. The monitor checks Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT)
sensor to warm up in a predictable manner when engine is generating sufficient heat. A timer is started while
engine is at moderate load and vehicle speed is above a calibrated limit. Target timer value is based on ambient
air temperature at start-up. If timer exceeds the target time and ECT/CHT has not warmed up to target
temperature, a malfunction is indicated. The test runs if start-up intake air temperature from IAT sensor is at, or
below target temperature. A 2-hour engine off soak time is required to erase a pending or confirmed DTC. This
soak time feature prevents false-passes of monitor when the engine coolant temperature rises after engine is
turned off during a short engine off soak period. The target temperature will be calibrated to thermostat
regulating temperature minus 20°F (11°C). For a typical 195°F (90°C) thermostat, warm-up temperature would
be calibrated to 175°F (79°C). For the 2003 model year, some vehicle calibrations may lower the target
temperature when ambient temperature is below 50°F (10°C). This lower target temperature is for vehicles that
do not warm-up to the thermostat regulating temperature when ambient temperature is 20-50°F (-7-10°C).

Inputs

ECT or CHT, IAT, engine LOAD (from MAF sensor) and vehicle speed input. Typical monitor entry
conditions are as follows:

z

Vehicle speed more than 15 MPH.

z

Intake air temperature at start-up is between 20°F (-7°C) and target thermostat temperature.

z

Engine load more than 30 percent.

z

Engine off (soak) time more than 2 hours.

Output

Malfunction Indicator Lamp (MIL)

2003 Ford Pickup F150

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

PROGRAMMING PCM

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:

z

Clears the number of Diagnostic Trouble Codes (DTCs).

z

Clears the DTCs.

z

Clears the freeze frame data.

z

Clears diagnostic monitoring test results.

z

Resets status of the OBD-II system monitors.

z

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

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

NOTE:

This function may not be supported by all scan tools. Refer to scan tool
manufacturer's manual instruction.

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

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:

z

PROGRAMMING VID BLOCK FOR REPLACEMENT PCM

z

MAKING CHANGES TO THE VID BLOCK

z

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.

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 site 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.

2003 Ford Pickup F150

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