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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 150 (ENGINE CONTROL SYSTEM (L3))PCM REPLACEMENT

2011 Mazda 3 Mazdaspeed, 2.3 3

Pcm Replacement

2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Pcm Replacement

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Connect the WDS (or equivalent) to the DLC-2.

Fig 1: Locating DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.
Set up the WDS or equivalent (including the vehicle recognition.)
Perform the normal vehicle identification procedure.
Select "Module Programming", or with WDS select "toolbox" and "module programming".
Select "Programmable Module Installation".
Select "PCM" and perform procedures according to directions on the WDS (or equivalent) screen.
NOTE:
- If the PCM is replaced with a new one without performing "Programmable Module Installation" procedure, the PCM stores DTC P0602 and illuminates the MIL. This is because the vehicle information was not programmed in the PCM. After completing the "Programmable Module Installation" procedure, various U**** DTCs are stored, which is normal.
Retrieve DTCs with the WDS (or equivalent), erase them, and verify that there are no DTCs present and the MIL is off.
- If DTCs are still present, perform applicable DTC inspection.

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.