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System Description
NFEC1320
COOLING FAN CONTROL
NFEC1320S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Wheel sensor Vehicle speed
Cooling fan
control
Cooling fan relay(s)
Engine coolant temperature sensor Engine coolant temperature
Air conditioner switch Air conditioner “ON” signal
Ignition switch Start signal
Refrigerant pressure sensor Refrigerant pressure
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger-
ant pressure and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
OPERATION
NFEC1320S02
SEC925C
CONSULT-II Reference Value in Data Monitor
Mode
NFEC1321
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
AIR COND SIG
I Engine: After warming up, idle
the engine
Air conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates)
ON
DTC P1217 ENGINE OVER TEMPERATURE
System Description
EC-532
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