Condenser Fan: Description and Operation
SYSTEM OUTLINEFAN MOTOR OPERATION (2AZ-FE)
With the ignition SW turned on, the current through the ECU-IG fuse flows to the FAN NO.2 relay (Coil side), FAN NO.3 relay (Coil side). furthermore, the current through the FAN NO.2 relay (Coil side) flows to TERMINAL 3 of the A/C single pressure SW to GROUND, causing the FAN NO.1 relay to turn on and the FAN NO.2 relay to turn on.
1. LOW SPEED OPERATION (2AZ-FE)
When the ignition SW is turned on and the A/C system is activated, the A/C condenser fan motor and the radiator fan motor rotates at low speed.
When the A/C system is activated, the current from ECU-IG fuse flows to the FAN NO.3 relay (Coil side) to TERMINAL 1 of the diode (A/C) to TERMINAL 2 to TERMINAL 2 of the engine control module, causing the FAN NO.3 relay to turn on. As a result, the current through the CDS fuse flows to TERMINAL 5 of the FAN NO.3 relay to TERMINAL 3 to TERMINAL 2 of the A/C condenser fan motor to TERMINAL 1 to TERMINAL 3 of the FAN NO.2 relay to TERMINAL 4 to TERMINAL 2 of the radiator tan motor to TERMINAL 1 to GROUND.
2. HIGH SPEED OPERATION (2AZ-FE)
The A/C condenser fan motor and radiator fan motor rotates at high speed when the engine control module detects abnormally high coolant temperature or when the A/C single pressure SW is OFF.