DTC P0115: Engine Coolant Temperature Circuit Malfunction; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input: Description
A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor.
The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.
HINT:
When DTC P0115, P0117 or P0118 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. The ECM continues operating in fail-safe mode until a pass condition is detected.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0115 | Open or short in the engine coolant temperature sensor circuit for 0.5 seconds (Engine coolant temperature sensor voltage is below 0.14 V or higher than 4.91 V) (1 trip detection logic). |
|
| P0117 | Short in the engine coolant temperature sensor circuit for 0.5 seconds (Engine coolant temperature sensor voltage is below 0.14 V [Higher than 140°C (284°F)]) (1 trip detection logic). |
|
| P0118 | Open in the engine coolant temperature sensor circuit for 0.5 seconds (Engine coolant temperature sensor voltage is higher than 4.91 V [Below -40°C (-40°F)]) (1 trip detection logic). |
|
HINT:
When any of these DTCs are stored, check the engine coolant temperature by entering the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
| Temperature Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) or higher | Short circuit |