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
Pending code
- The pending code is a temporary malfunction code which differs from the DTC stored when the PCM or TCM detects a system malfunction.
- When the PCM or TCM detects a system malfunction, a DTC is stored in the PCM or TCM according to the number of drive cycles. On the other hand, the pending code is stored in the PCM or TCM regardless of the number of drive cycles.
- When the PCM or TCM determines that the system is normal, the pending code stored in the PCM or TCM is cleared from the PCM or TCM from the next drive cycle.
- Pending codes can be read out by implementing a quick check or an on-demand self-test using the M-MDS. (See DTC INSPECTION .)
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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