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 Focus L4-2.3L VIN ZFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Service and Repair
REMOVAL
1. Disconnect the battery ground cable.
2. Remove the instrument panel side trim.
3. Remove the cowl side trim panel.
4. Remove the glovebox.
5. Remove the passenger side lower footwell trim panel.
6. Remove the Central Security Module (CSM).
1 Remove the two retaining nuts.
2 Remove the (CSM) and bracket and position aside.
7. Disconnect the powertrain control (PCM) module electrical connectors and remove the PCM.
INSTALLATION
1. To install, reverse the removal procedure.
1. Disconnect the battery ground cable.
2. Remove the instrument panel side trim.
3. Remove the cowl side trim panel.
4. Remove the glovebox.
5. Remove the passenger side lower footwell trim panel.
6. Remove the Central Security Module (CSM).
1 Remove the two retaining nuts.
2 Remove the (CSM) and bracket and position aside.
7. Disconnect the powertrain control (PCM) module electrical connectors and remove the PCM.
INSTALLATION
1. To install, reverse the removal procedure.
Factory Service Tools
Use the Manual With the Right Hardware
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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.