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EG-50
9. Cooling Fan Control System
D A cooling fan control system in which the THS ECU controls the cooling fan speed in accordance with
the engine coolant temperature, inverter water temperature and the air conditioning operating condition.
D The THS ECU controls the cooling fan speed based on A/C pressure sensor signal, inverter water
temperature signal and engine coolant temperature sensor signals. This control is accomplished by
operating the 2 fan motors in 2 stages at low speed (series connection) and high speed (parallel
connection).
"
A
Wiring Diagram
CDS FAN
RDI FAN
DC/DC
Main Body ECU
Battery
MG ECU
"
Cooling Fan Operation
Air Conditioning
Air Conditioning
Operating Condition
OFF
OFF
A/C Pressure "Low"
A/C Pressure "Low"
A/C Pressure "Low"
A/C Pressure "High"
A/C Pressure "High"
ENGINE - 2AZ-FXE ENGINE
IG1 Relay
ECU IG No.1
Fan
No.1
Relay
Radiator
Fan Motor
Inverter
Water Temp.
A
Engine Coolant Temp.
Engine Coolant Temp.
Inverter Water Temp.
Low
Low
High
Low
High
High
Low
Low
High
Low
High
High
High
Low
High
High
Fan
3 4
No.2
5
Relay
FANH
THS ECU
CAN (CAN No.1 Bus)
A/C Pressure Sensor
A/C ECU
Relay Operation
No.1
No.2
No.3
OFF
3 to 4
OFF
ON
ON
3 to 5
3 to 5
ON
ON
OFF
3 to 4
ON
ON
ON
3 to 5
3 to 5
ON
ON
ON
ON
3 to 5
3 to 5
ON
ON
Condenser
Fan Motor
Fan
No.3
Relay
Engine
Coolant
Temp. Sensor
FANL
THW
02HEG21TE
Cooling
Cooling
Fan Motor
Fan Motor
Fan
Fan
Connection
Operation
OFF
OFF
Parallel
Parallel
High
High
Series
Low
Parallel
Parallel
High
High
Parallel
Parallel
High
High
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