2004 Mazda MX-5 Miata Base, StandardFACTORY OEM SERVICE PROCEDURE

Pcm Removal/Installation

  1. Disconnect the negative battery cable.
  2. Disconnect the connector from the PCM installed on the upper part of the brake pedal.
  3. Remove the bolt and nut holding the PCM.
    Fig 1: Locating PCM Installation Bolt
    G00989670Courtesy of MAZDA MOTORS CORP.
    1. Push the harness (PCM harness) installed to the brake pedal bracket in the opposite direction of the brake pedal bracket.
    2. While pushing the harness, push the stay until it comes apart from the stud with the PCM installation nut.
      Fig 2: Removing Stay With Installation Nut
      G00989671Courtesy of MAZDA MOTORS CORP.
    3. Remove the PCM installation nut.
      Fig 3: Locating Stud & PCM Installation Nut
      G00989672Courtesy of MAZDA MOTORS CORP.
  4. Install in the reverse order of removal.

Tightening torque 

  1. Bolt, nut: 7.9-10.7 N.m {80-110 kgf.cm, 70-95.4 in.lbf} 
Factory Service Tools

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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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