Cooling Fan System

Cooling fan system

Explanation of circuit

For the cooling fan, the engine control computer turns ON/OFF the cooling fan relay using the engine coolant temperature, A/C switch, A/C refrigerant pressure, engine speed and vehicle speed signals. To control the cooling fan motor speed in two stages, the engine control computer turns ON/OFF the fan relay to switch between the series and parallel connections of cooling fan motor circuit.

Circuit Figure





Inspection steps

NOTE:
Read the freeze frame data using the SSM3. In the freeze frame data, part of the engine running condition at a trouble occurrence is stored and these information is helpful for troubleshooting.

CAUTION:
Check the fuse of this circuit before troubleshooting.