Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Ford Excursion 4WD V8-6.0L DSL TurboFACTORY OEM SERVICE PROCEDURE
Powertrain Control Module
Powertrain Control Module
The center of the Electronic Control (EC) system is a microprocessor called the Powertrain Control Module (PCM). The PCM has a Transmission Control Module (TCM) internal to the PCM for automatic transmission equipped vehicles. The PCM has three electrical connectors (122 pins). The PCM receives input from sensors and other electronic components (switches, relays, etc.) and places this information is RAM or Keep Alive RAM. Based on information programmed into its memory (ROM), the PCM generates output signals to control various relays, solenoids and actuators. For vehicles equipped with manual transmissions, only two plugs are used.
The TCM controls the Power Monitor Strategy. The Power Monitor monitors engine speed at idle. If an abnormal engine speed increase is detected, the Power Monitor will command the Fuel Injection Control Module (FICM) off in an effort to maintain a normal idle speed. For manual transmission vehicles, the Power Monitor is the only active TCM function. DTCs will be stored if the Power Monitor is active.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.