DTC | P0116 | Engine coolant temperature circuit range/performance |
P0117 | Engine coolant temperature circuit low input | |
P0118 | Engine coolant temperature circuit high input |
The engine coolant temperature sensor (ECTS, A) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature. The ECTS uses a thermistor whose resistance changes with the temperature. The electrical resistance of the ECTS decreases as the engine coolant temperature increases, and increases as the engine coolant temperature decreases.The 5 V power source in the ECM is supplied to the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance value of the thermistor in ECTS changes according to the engine coolant temperature, the signal voltage also changes. This information of engine coolant temperature is used in determination of basic fuel quantity and cooling fan control.
DTC No | Detecting Condition & Limp Home | Suspect area |
P0116 P0117 P0118 | Detecting Condition P0116 : The measured engine coolant temperature is lower than the threshold value when the model value is higher than the threshold value. P0117 : The output signal voltage ≤ 0.23 V P0118 : The output signal voltage ≥ 4.97V Enable Condition Ignition switch : ON Limp Home Default value out of cranking: 80°C Default value in cranking: -10°C Cooling fan is active. Auxiliary water heater control deactivated. Air conditioning control deactivated. | - Open or short in ECTS circuit - ECTS - ECM |
ECTS | Normal Parameter | |
Temperature | 20°C | 80°C |
Resistance | 2.31 ~ 2.59kΩ | 0.31 ~ 0.33kΩ |
Proceed with ECM problem procedure. |
