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
WARNING: This page is about a different variant/trim than selected.
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Display the PCM PID [BOOST_AIR_TEMP] and [BOOST_AIR_TEMP_VOLT]. (See PID/DATA MONITOR INSPECTION .) (See PID/DATA MONITOR TABLE [PCM (VIN Y)] .)
- Compare the voltage and temperature indications for the PIDs [BOOST_AIR_TEMP_VOLT] and [BOOST_AIR_TEMP] with the standard in the table indicated below.
- If they do not match the standard, perform the resistance inspection. (See RESISTANCE INSPECTION .)
STANDARD VOLTAGE SPECIFICATION
| PID [BOOST_AIR_TEMP_VOLT] | PID [BOOST_AIR_TEMP] |
|---|---|
| V | °C {°F} |
| Approx. 3.57 | 20 {68} |
| Approx. 2.70 | 40 {104} |
| Approx. 1.87 | 60 {140} |
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.