DTC P0125 ENGINE COOLANT TEMPERATURE (ECT) SENSOR; Component Description; CONSULT-II Reference Value; On Board Diagnosis Logic
EF & EC-7096spec tableECT sensor reuses same diagnostic terminal (ECM 70) as P0115; references P0115 procedure on EC-7086. NKEC0073/NKEC0074 figure IDs printed beside table headings preserved as captions if needed.
CG10, CGA3
Component Description
NOTE
If DTC P0125 is displayed with P0115, first perform trouble diagnosis for DTC P0115, EC-7086.
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.
<Reference data>
ECTS Reference Data — Temperature vs Voltage vs Resistance
-10 (14)
Voltage* V4.4
Resistance kΩ7.0 - 11.4
20 (68)
Voltage* V3.5
Resistance kΩ2.1 - 2.9
50 (122)
Voltage* V2.2
Resistance kΩ0.68 - 1.00
90 (194)
Voltage* V0.9
Resistance kΩ0.236 - 0.260
NOTE
*: These data are reference values and are measured between ECM terminal 70 (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 grond other than ECM terminals, such as the ground.
CONSULT-II Reference Value in Data Monitor Mode
CONSULT-II Data Monitor — Coolant Temperature
COOLAN TEMP/S
CONDITIONEngine: After warming up
SPECIFICATIONMore than 70°C (158°F)
On Board Diagnosis Logic
See also
EC-7086