ELECTRICAL FAN CONTROL OPERATION [MZR 1.6]

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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/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

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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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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