ELECTRICAL FAN CONTROL OPERATION [L8, LF]
id0140i7104000
• 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.
• When the operation conditions are met for each function, the PCM sends an operation signal to cooling fan relay No.1 or No.2/No.3 to operate the cooling fan motors.
• The rotation speed of the cooling fan motor is switched between three levels according to a combination of the cooling fan relays.
• The cooling fan motor operation switches in the order of stop, low speed, middle speed, and high speed, taking 3 s for each operation while regular-driving cooling.
Operation Conditions
|
Function
|
Operation condition
|
Cooling fan motor rotation speed
|
Cooling fan relay
|
|
ECT
|
A/C amplifier
(A/C switch)
|
Refrigerant pressure switch
(high, low)
|
Vehicle speed
|
No.1
|
No.2
|
No.3
|
|
Regular-driving cooling
|
Less than 100 °C {212 °F}
|
OFF
|
-
|
Stop
|
OFF
|
|
ON
|
OFF
|
More than 70 km/h {44 mph}
|
|
45 -70 km/h {28-43 mph}
|
Low
|
ON
|
OFF
|
OFF
|
|
Less than 45 km/h {27 mph}
|
Middle
|
ON
|
OFF
|
ON
|
|
ON
|
-
|
High
|
ON
|
|
100-108 °C {213-226.4 °F}
|
OFF
|
-
|
Middle
|
ON
|
OFF
|
ON
|
|
ON
|
High
|
ON
|
|
More than 108 °C {227 °F}
|
-
|
|
After-cooling
|
• When all the following conditions are met:
-
- Ignition switch: OFF
-
- Estimated maximum engine coolant temperature is high after engine stop
|
Low
|
ON
|
OFF
|
OFF
|
|
• When all the following conditions are met:
-
- Estimated maximum engine coolant temperature is the specified value or more even when operating at low rotation speed.
|
Middle
|
ON
|
OFF
|
ON
|
