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.
2019 Mazda 3 Preferred, 4D Hatchback, AWDFACTORY OEM SERVICE PROCEDURE
Function Inspection
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Display the PIDs EVAP_PRESS and FTP. (See PID/DATA MONITOR INSPECTION .)
- Compare the voltage and fuel tank pressure indications for the PIDs EVAP_PRESS and FTP with the standard in the table indicated below.
- If they do not match the standard, perform the voltage inspection. (See VOLTAGE INSPECTION .)
Standard
FUEL TANK PRESSURE SPECIFICATION
| EVAP_PRESS | FTP | ||
|---|---|---|---|
| V | kPa {kgf/cm2 , psi}(1) | ||
| Approx. 1.2 | -2.5 {-0.025, -0.36} | ||
| Approx. 2.6 | 0 {0, 0} | ||
| Approx. 4.6 | +3.5 {+0.036, +0.51} | ||
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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.