Mazda 3 Workshop Manual page 633

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
8. Turn the A/C switch to on.
9. Verify that the cooling fan is operating while the ECT PID is below 98 °C {209 °F}.
• If the cooling fan does not operate, inspect for the following:
- A/C switch
- A/C refrigerant pressure switch
- Fan control module power supply circuit (open or short circuit)
- Fan control module GND circuit (open or short circuit)
- Fan control module control signal circuit (open or short circuit between fan control module
terminal B and PCM terminal 1W)
- Fan control module
(See COOLING FAN MOTOR COMPONENT
10. Verify that the cooling fan operates at medium speed while the COLP PID is off and high speed while
the COLP PID is on.
• If the cooling fan does not operate middle and/or high speed, inspect for the following:
- A/C refrigerant pressure switch (medium switch)
- Fan control module
(See COOLING FAN MOTOR COMPONENT
11. Turn the A/C switch to the off position.
12. Start the engine and idle it.
13. Verify that the cooling fan operating speed increases relative to the ECT PID increase.
• If the cooling fan speed does not increase inspect the following:
- ECT sensor (characteristic).
- Fan control signal circuit (between fan control module terminal B and PCM terminal 1W)
• If the all items are normal, replace the cooling fan component.
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