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.
2020 Mazda 3 Base, 4D Hatchback, AWDFACTORY OEM SERVICE PROCEDURE
Function Inspection
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Display the PID MAF. (See PID/DATA MONITOR INSPECTION .)
- Compare the voltage and flow rate indications for the PID MAF with the standard in the table indicated below.
- If they do not match the standard, replace the MAF sensor/IAT sensor No. 1. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION .)
Standard
MASS AIR FLOW (MAF) SENSOR SPECIFICATION
| MAF | Remarks | |
|---|---|---|
| V | g/s {lb/min} | |
| Approx. 1.69 | 0.00 {0.000} | Ignition switched ON (engine off) |
| Approx. 1.89 | 1.77 {0.234} | Idle (after warm up) |
| Approx. 2.02 | 5.02 {0.664} | Racing (Engine speed: 2, 000 RPM) |
Factory Service Tools
Use the Manual With the Right Hardware
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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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