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.
2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE
Function Inspection
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Display the PCM PIDs [APP1] and [APP2]. (See PID/DATA MONITOR INSPECTION .)
- Compare the voltage and opening angle indications for the PIDs [APP1] and [APP2] with the standard in the table indicated below.
- If they do not match the standard, perform the voltage inspection. (See VOLTAGE INSPECTION .)
STANDARD VOLTAGE SPECIFICATION
| Condition/ | APP1 | APP2 | ||
|---|---|---|---|---|
| V | % | V | % | |
| Accelerator pedal released | Approx. 0.75 | Approx. 15 | Approx. 0.38 | Approx. 7.45 |
| Accelerator pedal depressed | Approx. 4.52 | Approx. 90.58 | Approx. 2.26 | Approx. 45.49 |
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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