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Description
NGEC0602
NOTE:
If DTC P0125 (0908) is displayed with P0115 (0103), first per-
form the trouble diagnosis for DTC P0115. Refer to EC-755.
SEF594K
COMPONENT DESCRIPTION
NGEC0602S01
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 9.2
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 the ECM terminals, such
as the ground.
On Board Diagnosis Logic
NGEC0603
Malfunction is detected when voltage sent to ECM from the sen-
sor is not practical, even when some time has passed after start-
ing the engine, or engine coolant temperature is insufficient for
closed loop fuel control.
POSSIBLE CAUSE
NGEC0603S01
쐌 Harness or connectors
(High resistance in the circuit)
쐌 Engine coolant temperature sensor
쐌 Thermostat
DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS)
VG33E
Description
EC-773
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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