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 Mazda 3 L4-2.5LFACTORY OEM SERVICE PROCEDURE
PCM Reprogramming
PCM REPROGRAMMING [LF, L5]
L5
CAUTION:
- If the crankshaft and the cylinder block are replaced with a type B from a type A as shown in the figure, perform PCM reprogramming. Otherwise, the engine could be damaged.
Crankshaft
Cylinder block
NOTE:
- Use the IDS (laptop PC) because the PDS (Pocket PC) does not support the PCM REPROGRAMMING.
1. Connect the M-MDS to DLC-2.
2. After the vehicle is identified, select the following items from the M-MDS initialization screen.
- Select the "Module Programming".
3. Then, select "Module Reprogramming" and "PCM" from the screen menu.
4. Perform the PCM reprogramming following the instructions on the screen.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.