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.
2010 Mercury Mariner 2WD V6-3.0LFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Service and Repair
Powertrain Control Module (PCM)
Removal
1. NOTE: PCM installation DOES NOT require new keys or programming of keys, only a Parameter Reset of the Passive Anti-Theft System (PATS).
Retrieve the module configuration. Carry out the module configuration retrieval steps of the Programmable Module Installation (PMI) procedure. Programming and Relearning
2. Detach the wiring harness retainer from the cowl stud bolt.
3. Disconnect the 3 PCM electrical connectors.
4. Remove the 2 bolts and the PCM.
5. Remove and inspect the PCM cowl seal; install new if damaged.
Installation
1. Install the PCM cowl seal.
2. Install the PCM and the 2 bolts.
- Tighten to 8 Nm (71 lb-in).
3. Connect the 3 PCM electrical connectors.
4. Attach the wiring harness retainer to the cowl stud bolt.
5. Restore the module configuration. Carry out the module configuration restore steps of the Programmable Module Installation (PMI) procedure. For additional information, refer to Information Bus. Programming and Relearning
6. Reprogram the PATS. Carry out the Parameter Reset procedure. For additional information, refer to Antitheft and Alarm Systems. Passive Anti-Theft System (PATS) Parameter Reset
7. Using the scan tool, perform the Misfire Monitor Neutral Profile Correction procedure, following the on-screen instructions.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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