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
Revolution sensor signal
Wave pattern (reference)
PCM terminals
- 1 AC (+) - body ground (-)
Oscilloscope setting
- 2 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
- Idle (after warm up)
PCM terminals
- 1 AC (+) - body ground (-)
Oscilloscope setting
- 2 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
- 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.