ELECTRICAL FAN CONTROL OPERATION [13B-MSP]

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•  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 or No.4/No.5 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 rotates at low speed when only cooling fan relay No.1 is on, at middle speed when cooling fans, in addition to No.1, No.2 and No.3 are on, and at high speed when cooling fans No.4 and No.5 turn on.

Operation condition

Function

Cooling fan motor

Cooling fan relay

Operation condition

No.1

No.2

No.1

No.2/No.3

No.4/No.5
Regular driving cooling
Stop
Stop
OFF
OFF
OFF
•  ECT less than 97 °C {207 °F} and A/C switch OFF
Low speed rotation
Low speed rotation
ON
OFF
OFF
•  ECT less than 97 °C {207 °F} and A/C switch ON (Refrigerant pressure switch OFF)
•  ECT is 97—101 °C {207—213 °F} and Refrigerant pressure switch OFF
Middle speed rotation
Middle speed rotation
ON
ON
OFF
•  ECT is 101—108 °C {214—226 °F}
•  ECT less than 101 °C {214 °F} and Refrigerant pressure switch ON
•  ECT or above 108 °C {226 °F} and A/C switch ON (Refrigerant pressure switch OFF)
High speed rotation
High speed rotation
ON
ON
ON
•  ECT or above 108 °C {226 °F} and A/C switch OFF
•  ECT or above 108 °C {226 °F} and Refrigerant pressure switch ON
After cooling
Middle speed rotation
Middle speed rotation
ON
ON
OFF
•  When all the following conditions are met:
―  Ignition switch: OFF
―  Drive-by-wire relay: OFF
―  Metering oil pump: Other than during ignition switch off mode
―  Engine compartment temperature high or ECT 110 °C {230 °F} or more.
Forced drive
High speed rotation
High speed rotation
ON
ON
ON
•  During test mode (during test mode with M-MDS) when the AP is depressed.
Fail safe
High speed rotation
High speed rotation
ON
ON
ON
•  When a failure occurs in the ECT sensor.

Wiring diagram

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