ELECTRICAL FAN CONTROL OPERATION [MZI-3.7]

id0140c3104000

Single Fan Control Module

• The PCM compares the duty ratios determined at the engine coolant temperature and refrigerant pressure controls and sends the higher duty ratio as the control signal to the fan control module.

Engine coolant temperature control

PCM output duty ratio	Engine operation conditions
100 %	• Engine coolant temperature is less than 96°C {205°F}.
70—30 %	• Engine coolant temperature is 96—106°C {205—223°F}.
0 %	• Engine coolant temperature is more than 106°C {223°F}.

Refrigerant pressure control

PCM output duty ratio	Engine operation conditions
44 %	• When all of the following conditions are met: ― A/C is on. ― Refrigerant pressure switch (medium pressure) is on.
53 %	• When all of the following conditions are met: ― A/C is on. ― Refrigerant pressure switch (medium pressure) is off. ― Vehicle speed is 70 km/h {43 mph} or less.
100 %	• When all of the following conditions are met: ― A/C is on. ― Refrigerant pressure switch (medium pressure) is off. ― Vehicle speed is 70 km/h {43 mph} or more.

Dual Fan Control Module

• The PCM compares the duty ratios determined at the engine coolant temperature and refrigerant pressure controls and sends the higher duty ratio as the control signal to the fan control module.

Engine coolant temperature control

PCM output duty ratio	Engine operation conditions
100 %	• Engine coolant temperature is less than 96°C {205°F}.
70—25 %	• Engine coolant temperature is 96—106°C {205—223°F}.
0 %	• Engine coolant temperature is more than 106°C {223°F}.

Refrigerant pressure control

PCM output duty ratio	Engine operation conditions
45 %	• When all of the following conditions are met: ― A/C is on. ― Refrigerant pressure switch (medium pressure) is on.
52 %	• When all of the following conditions are met: ― A/C is on. ― Refrigerant pressure switch (medium pressure) is off. ― Vehicle speed is 70 km/h {43 mph} or less.
100 %	• When all of the following conditions are met: ― A/C is on. ― Refrigerant pressure switch (medium pressure) is off. ― Vehicle speed is 70 km/h {43 mph} or more.