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Description
NFEC0869
NOTE:
If DTC P0125 is displayed with P0117, P0118, first perform the
trouble diagnosis for DTC P0117, P0118. Refer to EC-207.
SEF594K
COMPONENT DESCRIPTION
NFEC0869S01
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 93
(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.
On Board Diagnosis Logic
NFEC0870
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0125
0125
Insufficient engine
coolant temperature
for closed loop fuel
control
I Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.
I Engine coolant temperature is insufficient for
closed loop fuel control.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Engine coolant temperature sensor
I Thermostat
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0125 ECT SENSOR
Description
EC-213
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