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SEF594K
Component Description
NGEC0072
The engine coolant temperature sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the
engine coolant temperature input. The sensor uses a thermistor
which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.
SEF012P
<Reference data>
Engine coolant temperature
°C(°F)
Voltage*
V
Resistance
kΩ
−10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
*: These data are reference values and are measured between ECM terminal 59
(Engine coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
CONSULT-II Reference Value in Data Monitor
Mode
NGEC0073
MONITOR ITEM CONDITION SPECIFICATION
COOLAN TEMP/S 쐌 Engine: After warming up More than 70°C (158°F)
On Board Diagnosis Logic
NGEC0074
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0115 쐌 An excessively high or low voltage from the sensor is
sent to ECM.*
쐌 Harness or connectors
(The sensor circuit is open or shorted.)
쐌 Engine coolant temperature sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC P0115 ENGINE COOLANT TEMPERATURE
SENSOR (ECTS) (CIRCUIT)
KA24DE
Component Description
EC-168
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