Mazda 3 Workshop Manual page 769

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Due to the cooling fan protection function, there is a time lag until the fan control signal reaches
the specified duty value. (Example: If a fan control signal with a 90 % duty value is input while the
cooling fan is stopped, it takes approx. 14 s until the fan speed increases and stabilizes.)
4. Using the "FAN DUTY" simulation function, input fan control signals with duty values of 20 %, 40 %, 60
%, and 80 % at 30 s intervals and verify that the cooling fan operation speed increases.
• If the cooling fan does not operate, inspect the following:
- Open or short circuit in fan control module power supply
- Open or short circuit in fan control module ground
- Open or short circuit in the wiring harness between fan control module terminal B and PCM
terminal 1AP (Z6)/ 1W (LF).
• If the wiring harnesses and connectors are normal, inspect the cooling fan component.
• If the cooling fan operation speed does not increase, replace the cooling fan component.
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