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.

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HOMESERVICE MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROL SYSTEM [L3 WITH TC]PCM REMOVAL/INSTALLATION

2011 Mazda 3 Mazdaspeed, 2.3 3

Pcm Removal/Installation

2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Pcm Removal/Installation

Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [L3 WITH TC] ).
Disconnect the negative battery cable.
Remove the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [L3 WITH TC] ).
Remove the following items: (See BATTERY REMOVAL/INSTALLATION [L3 WITH TC] ).
- Battery
- PCM cover No. 1
Disconnect the PCM connector.
Remove the battery tray and PCM component. (See BATTERY REMOVAL/INSTALLATION [L3 WITH TC] ).
Remove in the order indicated in the table.

Fig 1: PCM Cover No. 2 And PCM Bracket With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
CAUTION:
- If the PCM connector is connected incorrectly it could be damaged. When connecting the PCM connector, connect it using the following procedure.
- If the PCM connector is inserted at an angle and the lever is moved, the connector could be damaged. Verify that the PCM connector is inserted straight.
  
  Fig 2: Identifying Proper And Improper Position Of PCM Connector
  Courtesy of MAZDA MOTORS CORP.
Verify that the PCM connector lever is tilted towards the wiring harness side as shown in the figure.
Insert the PCM connector straight until it contacts the PCM and verify that the lever reverts upward naturally.

Fig 3: Identifying PCM Connector Lever And Wiring Harness Side
Courtesy of MAZDA MOTORS CORP.
Push the lever until a click is heard.
When replacing the PCM on the vehicles, perform the following:
- PCM configuration (See PCM CONFIGURATION ).
- Immobilizer system component replacement/key addition and clearing (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [KEYLESS ENTRY SYSTEM] ). (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ).
  
  Fig 4: Pushing Lever Click Heard
  Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

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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.