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
Symptom Troubleshooting - Engine
- A/C Does Not Work Sufficiently (SKYACTIV-G)
- A/C Is Always On Or A/C Compressor Runs Continuously (SKYACTIV-G)
- Blown Fuses (SKYACTIV-G (Us))
- Check Engine Light Illuminates (SKYACTIV-G)
- Control System Device And Control Relationship Chart (SKYACTIV-G (Us))
- Cooling System Concerns-Overheating (SKYACTIV-G (Us))
- Cooling System Concerns-Runs Cold (SKYACTIV-G)
- Cranks Normally But Will Not Start (SKYACTIV-G)
- Emission Compliance (SKYACTIV-G (Us))
- Engine Control System Operation Inspection (SKYACTIV-G (Us))
- Special Service Tool (SST)
- Drive-by-wire Control System Inspection
- Electronic Control Throttle Operation Inspection
- Brake override system operation inspection
- Fuel Cut Control System Inspection
- If data monitor function of M-MDS is used
- If data monitor function of M-MDS is not used
- A/C Cut-off Control System Inspection
- Related PIDs
- Evaporative Emission (EVAP) System Leak Inspection
- Safety precautions
- Dual purpose diagnostic leak detector (EVAP/low pressure) component parts
- Air only test
- Vapor test
- Engine Noise (SKYACTIV-G (Us))
- Engine Oil Warning Light Illuminated/Message Related To Engine Hydraulic Pressure Malfunction Indicated In Display (SKYACTIV-G)
- Engine Runs Rough/Rolling Idle (SKYACTIV-G (Us))
- Engine Stalls-After Start/At Idle (SKYACTIV-G)
- Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges (SKYACTIV-G (Us))
- Exhaust Smoke (SKYACTIV-G (Us))
- Exhaust Smoke (SKYACTIV-G)
- Fast Idle/Runs On (SKYACTIV-G (Us))
- Fuel Filling Shut Off Concerns (SKYACTIV-G)
- Fuel Odor (In Engine Compartment) (SKYACTIV-G (Us))
- Fuel Refill Concerns (SKYACTIV-G)
- Hard To Start/Long Crank/Erratic Start/Erratic Crank (SKYACTIV-G (Us))
- Hard To Start/Long Crank/Erratic Start/Erratic Crank (SKYACTIV-G)
- High Oil Consumption/Leakage (SKYACTIV-G)
- Knocking/Pinging-Acceleration/Cruise (SKYACTIV-G)
- Lack/Loss Of Power-Acceleration/Cruise (SKYACTIV-G (Us))
- Low Idle/Stalls During Deceleration (SKYACTIV-G (Us))
- No Cylinder Deactivation (SKYACTIV-G)
- Poor Fuel Economy (SKYACTIV-G)
- Quick Diagnostic Chart (SKYACTIV-G (Us))
- Spark Plug Condition (SKYACTIV-G)
- Sulfuric Smell Occurs (SKYACTIV-G)
- Symptom Diagnostic Index (SKYACTIV-G (Us))
- Vibration Concerns (Engine) (SKYACTIV-G (Us))
- Will Not Crank (SKYACTIV-G (Us))
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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