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System Description
NGEC0963
COOLING FAN CONTROL
NGEC0963S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Vehicle speed sensor Vehicle speed
Cooling fan
control
Cooling fan relay(s)
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Camshaft position sensor Engine speed
The ECM controls the cooling fan corresponding to the signals sent from the vehicle speed and engine cool-
ant temperature. The control system has 2-step control [ON/OFF].
OPERATION
NGEC0963S02
SEF666WA
CONSULT-II Reference Value in Data Monitor
Mode
NGEC0964
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
COOLING FAN
쐌 Engine: Idling, after warming up
쐌 Air conditioner switch: OFF
Engine coolant temperature is
94°C (201°F) or less.
OFF
Engine coolant temperature is
95°C (203°F) or more.
ON
On Board Diagnosis Logic
NGEC0965
This diagnosis checks whether the engine coolant temperature is
extraordinary high, even when the load is not heavy.
When malfunction is detected, the malfunction indicator lamp (MIL)
will light up even in the first trip.
Malfunction is detected when engine coolant temperature is exces-
sively high under normal engine speed.
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT
PROTECTION (WITH ELECTRIC COOLING FAN)
VG33E
System Description
EC-906
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