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 CX-3 AWDFACTORY OEM SERVICE PROCEDURE

Fan Control Module Inspection: Notes

Connect the M-MDS to the DLC-2.
Start and warm up the engine.
Monitor the engine coolant temperature with the M-MDS.
Measure the voltage at terminal B of the fan control module connector (3 terminals) as shown in the table.

Courtesy of MAZDA MOTORS CORP.
- If not within the specification, inspect the input signals from the following parts. If all the following parts are normal, replace the fan control module. (See COOLING FAN MOTOR REMOVAL/INSTALLATION .)
  - Engine Coolant Temperature (ECT) sensor
  - Refrigerant pressure sensor
  - Battery
  - DSC (HU/CM)

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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