ELECTRICAL FAN CONTROL [SKYACTIV-G 2.0, SKYACTIV-G 2.5]
id0140g2205000
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Caution
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• Vehicle specifications differ depending on the vehicle identification number (VIN).
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― Type A VIN:
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JM0 KE****** 100001−
JM6 KE****** 100001−
JM7 KE****** 100001−
JM8 KE****** 100001−
JMZ KE****** 100001−
KE10** 100001−
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― Type B VIN:
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JM0 KE****** 200001−
JM6 KE****** 200001−
JM8 KE****** 200001−
JMZ KE****** 200001−
KE10** 200001−
Outline
• Through cooling of the radiator and condenser by operation of the cooling fan according to vehicle conditions, engine reliability and cooling performance have been improved.
Block Diagram
Operation (Type A VIN)
• The PCM determines the demand airflow volume by the following conditions.
Operation Pattern
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Demand airflow volume
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Cooling fan relay
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Cooling fan motor
|
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No.1
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No.2/No.3
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No.1
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No.2
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No airflow
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OFF
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OFF
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Stop
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Stop
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Small
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ON
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OFF
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Low-speed
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Low-speed
|
|
Large
|
ON
|
ON
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High-speed
|
High-speed
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Engine coolant temperature condition
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• Controls the PCM output duty ratio according to the engine coolant temperature.
• The control temperature while the engine coolant temperature is decreasing is controlled differently than when it is increasing.
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.
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Operation condition
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Demand airflow volume
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• When any of the following conditions is met.
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― Refrigerant pressure: 1.3 MPa {13 kgf/cm2, 189 psi} or less, vehicle speed: 45 km/h {28 mph} or more
― Refrigerant pressure: 2.2 MPa {22 kgf/cm2, 319 psi} or less, vehicle speed: 85 km/h {53 mph} or more
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No airflow
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• When any of the following conditions is met.
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― Refrigerant pressure: 1.3 MPa {13 kgf/cm2, 189 psi} or less, vehicle speed: 45 km/h {28 mph} or less
― Refrigerant pressure: 1.3—1.5 MPa {14—15 kgf/cm2, 189—217 psi}, vehicle speed: 85 km/h {53 mph} or less
― Refrigerant pressure: 1.5—2.2 MPa {16—22 kgf/cm2, 218—319 psi}, vehicle speed: 65—85 km/h {41—52 mph}
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Small
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• When any of the following conditions is met.
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― Refrigerant pressure: 1.5—2.2 MPa {16—22 kgf/cm2, 218—319 psi}, vehicle speed: 65 km/h {40 mph} or less
― Refrigerant pressure: 2.2 MPa {22 kgf/cm2, 319 psi} or more
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Large
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After Cooling Control
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• If the ignition is switched off directly after continuous high engine-load travel, the PCM operates (demand airflow volume: low) the cooling fan for a maximum of 9 minutes when all of the following conditions are met due to the possibility that the engine may not restart as a result of a fuel supply malfunction caused by the high temperature.
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― Engine coolant temperature: 90°C {194 °F} or more
― Accumulated amount of engine heat is extremely large
― Driving record for vehicle speed of 25 km/h {16 mph} or more available
Operation (Type B VIN)
• 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/No.3
|
No.1
|
No.2
|
|
No airflow
|
OFF
|
OFF
|
Stop
|
Stop
|
|
Small
|
ON
|
OFF
|
Low-speed
|
Low-speed
|
|
Large
|
ON
|
ON
|
High-speed
|
High-speed
|
Engine coolant temperature condition
-
• Controls the PCM output duty ratio according to the engine coolant temperature.
• The control temperature while the engine coolant temperature is decreasing is controlled differently than when it is increasing.
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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).
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― Accumulated heat in engine compartment is extremely high
― During travel (vehicle speed 10 km/h or more)
― Engine coolant temperature: 90 °C {194 °F} or more
A/C operation condition
-
• Controls the demand airflow volume depending on the refrigerant pressure and vehicle speed when the A/C switch is on.
|
Operation condition
|
Demand airflow volume
|
|
• When any of the following conditions is met.
-
― Refrigerant pressure: 1.3 MPa {13 kgf/cm2, 189 psi} or less, vehicle speed: 45 km/h {28 mph} or more
― Refrigerant pressure: 2.2 MPa {22 kgf/cm2, 319 psi} or less, vehicle speed: 85 km/h {53 mph} or more
|
No airflow
|
|
• When any of the following conditions is met.
-
― Refrigerant pressure: 1.3 MPa {13 kgf/cm2, 189 psi} or less, vehicle speed: 45 km/h {28 mph} or less
― Refrigerant pressure: 1.3—1.5 MPa {14—15 kgf/cm2, 189—217 psi}, vehicle speed: 85 km/h {53 mph} or less
― Refrigerant pressure: 1.5—2.2 MPa {16—22 kgf/cm2, 218—319 psi}, vehicle speed: 65—85 km/h {41—52 mph}
|
Small
|
|
• When any of the following conditions is met.
-
― Refrigerant pressure: 1.5—2.2 MPa {16—22 kgf/cm2, 218—319 psi}, vehicle speed: 65 km/h {40 mph} or less
― Refrigerant pressure: 2.2 MPa {22 kgf/cm2, 319 psi} or more
|
Large
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After Cooling Control
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• If the engine is stopped directly after driving continuously at high load, air bubbles could occur in the fuel line due to the increase in the fuel temperature by the engine heat. 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 for a maximum period of 9 min (demand airflow volume: Low).
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― Engine coolant temperature: 90°C {194 °F} or more
― Accumulated heat in engine compartment is extremely high
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.
