ELECTRICAL FAN CONTROL OPERATION[L3 Turbo]
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Normal Driving Cooling Control
• Controls the PCM output duty ratio according to the engine coolant temperature as indicated in the graph.
• The control temperature while the engine coolant temperature is decreasing is controlled differently than when it is increasing.
High-Altitude Fan Control
• Because bubbles are easily formed in high-altitude locations where the air pressure is low, the fan is operated to control even a small increase in engine coolant temperature.
After Cooling Control
• The cooling fan may keep operating for a few seconds or minutes after the ignition switch is turned off depending on the engine coolant temperature.
• If the engine coolant temperature is at the set value (T1) or more and the estimated water temperature increases to the specified value or more when the engine is stopped (the ignition switch is turned off), the after cooling control starts operating and the cooling fan is operated at 30 %.
• If the engine coolant temperature is at the set value (T2) or more after 30 s from when the cooling control operation started, the engine coolant temperature is determined to be increasing abnormally and the cooling fan is operated at 55 %.
• When the engine coolant temperature decreases to the set value (T3) or less with the cooling fan operation maintained at 30 % or 55 %, the cooling fan is stopped and the after cooling control finishes.
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1
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Time
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2
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Cooling fan operation
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3
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Normal driving cooling control
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4
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After cooling control
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5
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Engine stop (IG off)
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When the A/C Signal is ON and the Refrigerant Pressure Signal is ON
• Turn the A/C switch ON and when the refrigerant pressure increases more than the given value, the control duty ratio from the PCM becomes approx. 100% regardless of the engine coolant temperature, and the cooling fan operates at the maximum speed.
During Test Mode
• Turn on the test mode using the Mazda Modular Diagnostic System (M-MDS), and with the accelerator pedal depressed, the PCM fixes the control duty ratio at the maximum value.
Fail-safe
• If the engine coolant temperature sensor is damaged, the PCM fixes the control duty ratio at the maximum value.
