Cooling Fan Control System Inspection

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Connect the M-MDS to the DLC-2.
Start the engine and warm it up to normal operating temperature.
Perform the KOER self test. (See KOEO/KOER SELF TEST .)
Verify that DTC P0480:00 or P0482:00 is not shown and the cooling fan operates during the KOER self test.
- If the DTC P0480:00 or P0482:00 is displayed, perform the DTC inspection. (See DTC P0480:00 [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) (See DTC P0482:00 [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
- If the cooling fans do not operate, proceed to the following:
  - Inspect the following parts in the indicated order in accordance with fan operation conditions.
- Open circuit between cooling fan relay and battery positive terminal
- Open circuit between cooling fan relay and ground
- Poor connection of the cooling fan relay
  - If there is no malfunction:
    - Replace the cooling fan component. (See COOLING FAN MOTOR REMOVAL/INSTALLATION .)