ELECTRICAL FAN CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]
ELECTRICAL FAN CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]
SM2565337
id0140u0205000
Outline
• Engine reliability and cooling performance have been improved through cooling of the radiator and condenser by operation of the cooling fan according to vehicle conditions.
Block Diagram
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Operation
• The PCM determines the demand airflow volume by the following conditions.
Operation Pattern
|
Demand airflow volume |
Cooling fan relay |
Cooling fan motor |
|
|---|---|---|---|
|
No.1 |
No.2 |
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|
No airflow
|
OFF
|
OFF
|
Stop
|
|
Small
|
ON
|
OFF
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Low-speed
|
|
Large
|
OFF
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ON
|
High-speed
|
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Engine coolant temperature condition
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• Changes the demand airflow volume according to the engine coolant temperature.• To suppress overheating, the cooling fan is operated when the engine coolant temperature is high. The demand airflow volume is large or small depending on the engine coolant temperature.
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• If high-load driving continues with low wind blowing against the vehicle, air bubbles in the fuel line could occur by the rise in the fuel temperature from the heat of the engine. To prevent poor engine starting performance by air trapped in the fuel line from the occurrence of air bubbles, if the following conditions are met, the PCM operates the cooling fan (Demand airflow volume: Low).• To suppress overheating, the cooling fan is operated when the engine coolant temperature is high. The demand airflow volume is large or small depending on the engine coolant temperature.
A/C operation condition
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• Controls the demand airflow volume depending on the refrigerant pressure and vehicle speed when the A/C switch is on.
|
Vehicle speed |
Refrigerant pressure |
||||
|---|---|---|---|---|---|
|
0.8 MPa {8 kgf/cm2, 116 psi} or less |
1.3 MPa {13 kgf/cm2, 189 psi} or less |
1.5 MPa {15 kgf/cm2, 218 psi} or less |
2.2 MPa {22 kgf/cm2, 319 psi} or less |
2.2 MPa {22 kgf/cm2, 319 psi} or more |
|
|
2 km/h {1 mph} or less
|
Large
|
Large
|
Large
|
Large
|
Large
|
|
20 km/h {12 mph} or less
|
No airflow
|
No airflow
|
Small
|
Large
|
Large
|
|
40 km/h {25 mph} or less
|
No airflow
|
No airflow
|
Small
|
Large
|
Large
|
|
65 km/h {40 mph} or less
|
No airflow
|
No airflow
|
No airflow
|
Large
|
Large
|
|
65 km/h {40 mph} or more
|
No airflow
|
No airflow
|
No airflow
|
No airflow
|
Large
|
After Cooling Control
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• Operates the cooling fan in up to 2 steps according to the engine coolant temperature.
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1st step
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― When the engine coolant temperature is 101 °C {214 °F} or more with the ignition switched OFF, the cooling fan is operated at low speed for 8 min.
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2nd step
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― When the engine coolant temperature is 113 °C {235 °F} or more after the 1st step is completed, the cooling fan is operated at low speed until the temperature is less than 113 °C {235 °F}, or maximum of 4 min have elapsed.
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Conditions during collision
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• If a collision signal from the SAS control module is received, the PCM stops the engine cooling fan to avoid use of battery voltage.