Cooling Fan Controls System Description CR-V

Cooling Fan Controls System Description

Overview

Receiving various signals (such as coolant temperature signals and refrigerant compression signals) from sensors, the PCM performs the fan control switching the fan speed (HI/LO) as needed. This control efficiently operates the radiator fan and A/C condenser fan, and improves fuel efficiency by reducing electrical load- Fan LO Control Operation

In fan LO control, the PCM switches the FAN LO terminal to the ON position, which then switches the radiator fan relay to the ON position. This causes current to flow from the 12 volt battery to the radiator fan relay, the radiator fan motor, the fan control relay and the A/C condenser fan motor, to create a series connection through the radiator fan motor and the A/C condenser fan motor. Using this series connection, the fan rotates at a lower speed-

Fan HI Control Operation

In fan HI control, the PCM powers the FAN LO terminal and the FAN HIGH terminal. This switches the radiator fan relay, the fan control relay, and the A/C condenser fan relay to the ON position. With the radiator fan relay and the fan control relay in the ON position, current from the 12 volt battery flows through the radiator fan relay to the radiator fan motor, and then through the fan control relay to the ground. This rotates the radiator fan at a high speed.In addition, with the A/C condenser fan relay and the fan control relay in the ON position, current from the 12 volt battery flows through the A/C condenser fan relay to the A/C condenser fan motor to the ground. This rotates the A/C condenser fan at a high speed-

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