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
Drive Selection Switch Inspection [(Us)]
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)] .)
- Remove the drive selection switch. (See DRIVE SELECTION SWITCH REMOVAL/INSTALLATION .)
- Measure the resistance between drive selection switch terminals B and C using a tester.
- If not within the specification, replace the drive selection switch. (See DRIVE SELECTION SWITCH REMOVAL/INSTALLATION .)
| Switch condition | Resistance (ohm) |
|---|---|
| SPORT switch held at on | Approx. 0 |
| OFF switch held at on | Approx. 470 |
| any switch not pressed | Approx. 2, 670 |
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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