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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 100 (ENGINE CONTROLS - REMOVE/INSTALL/OVERHAUL - 4.6L)ENGINE MANAGEMENTPOWERTRAIN CONTROL MODULE (PCM)REMOVAL & INSTALLATION
1991 Mercury Tracer Base, 4D Sedan, Automatic

Removal & Installation

1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Removal & Installation
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1995 Mercury Grand Marquis, 1995 Mercury Cougar, 1995 Lincoln Town Car, 1995 Lincoln Mark VIII, and 1995 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect battery ground cable.
  2. Remove RH cowl side trim panel to expose powertrain control module (PCM).
  3. Loosen engine control sensor wiring to PCM connector retainer bolt.
  4. Remove engine control sensor wiring connector from PCM.
  5. Remove PCM from powertrain control module bracket (PCM bracket) by pulling powertrain control module downward.
  6. To install, reverse Removal procedure. Tighten engine control sensor wiring connector retainer bolt to 2.7-3.7 N-m (24-32 lb-in).
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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.