Ford F150 Pickup. Instruction — part 1620

Fig. 12: Identifying Intake Manifold Tuning Valve System - LS, Sable & Taurus 3.0L (VIN S)
Courtesy of FORD MOTOR CO.

COMPUTERIZED ENGINE CONTROLS

POWERTRAIN CONTROL MODULE

Powertrain Control Module (PCM) monitors engine operating conditions by input received from engine
sensors. PCM receives input from sensors and other electronic components, such as switches or relays. Based
on information received and programmed into its memory, PCM generates output signals to control various
components, such as relays, solenoids and actuators.

NOTE:

Components are grouped into 2 categories. The first category covers INPUT

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline

There are 4 types of PCM used. A 150-pin PCM which has 3 separate electrical harness connectors (Aviator,
Explorer, LS, Mountaineer and Thunderbird), a 150-pin PCM which has 3 separate electrical harness
connectors (Focus 2.3L), a 122-pin PCM which has 3 separate electrical harness connectors (Expedition and
Navigator) and a 104-pin PCM which has one electrical harness connector (all others). See Fig. 13 -Fig. 16 .
For PCM location, see POWERTRAIN CONTROL MODULE LOCATION table.

PCM uses a memory integrated circuit chip which stores information for Keep Alive Random Access Memory
(KAM). For additional KAM information, see KEEP ALIVE RANDOM ACCESS MEMORY under
POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS. Flash Electrically
Erasable Programmable Read Only Memory (EEPROM) is an Integrated Circuit (IC) within PCM. This IC
contains software code required by PCM to control powertrain. For additional EEPROM information, see
FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY under
POWERTRAIN CONTROL SOFTWARE.

In the event that one or more input sensors fail, PCM initiates an alternative operating procedure called Failure
Mode Effects Management (FMEM) to allow the vehicle to maintain driveability. For additional information on
FMEM, see FAILURE MODE EFFECTS MANAGEMENT under POWERTRAIN CONTROL
SOFTWARE. If PCM detects an engine overheating condition, it activates a fail-safe cooling strategy. For
additional information, see FAIL-SAFE COOLING STRATEGY under POWERTRAIN CONTROL
SOFTWARE. In the event of PCM failure, Hardware Limited Operation Strategy (HLOS) will be activated. For
additional information on HLOS, see HARDWARE LIMITED OPERATION STRATEGY under
POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS.

POWERTRAIN CONTROL MODULE LOCATION

DEVICES , which control or produce voltage signals monitored by PCM. The
second category covers OUTPUT SIGNALS , covering components controlled
by PCM.

Application

Location

Aviator, Blackwood, Expedition, Explorer, Explorer Sport,
Explorer Sport Trac, F150 Pickup, Mountaineer & Navigator

Right Rear Of Engine Compartment,

Mounted On Cowl

Escape, Ranger & Town Car

Center Of Engine Compartment,

Mounted On Cowl

LS, Sable, Taurus & Windstar

Right Rear Of Engine Compartment,

Mounted On Cowl

Crown Victoria, Grand Marquis & Marauder

Behind Left Kick Panel, Near

Instrument Panel

Econoline

Left Rear Of Engine Compartment,

Near Brake Master Cylinder

Excursion & F250-550 Super-Duty Pickups

Behind Left Side Of Instrument Panel,

Near Brake Pedal

Focus & Mustang

Behind Right Kick Panel

Thunderbird

In Right Side Fenderwell, Behind

Right Shock Tower

ZX2

Center Of Instrument Panel, Below

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline

Fig. 13: Identifying 104-Pin PCM Connector Terminals
Courtesy of FORD MOTOR CO.

Fig. 14: Identifying 122-Pin PCM Connector Terminals
Courtesy of FORD MOTOR CO.

Center Console

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline

Fig. 15: Identifying 150-Pin PCM Connector Terminals (Focus 2.3L)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline