DTC P0116: Engine Coolant Temperature (ECT) Sensor 1 Circuit Range/Performance
P0116 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 CIRCUIT RANGE/PERFORMANCE
| Description: | Indicates the engine coolant temperature rationality test has failed. The powertrain control module (PCM) logic that sets this DTC indicates that ECT or cylinder head temperature (CHT) drifted higher than the nominal sensor calibration curve and could prevent 1 or more on-board diagnostic (OBD) monitors from completing. The PCM runs this logic after an engine off and a calibrated soak period (typically 6 hours). This soak period allows the intake air temperature (IAT) and engine coolant temperature (CHT or ECT) to stabilize and not differ by more than a calibrated value. DTC P0116 is set when all of the following conditions are met: The engine coolant temperature at engine start exceeds the IAT at engine start by more than a calibrated value, typically 17°C (30°F). The engine coolant temperature exceeds a calibrated value, typically 107°C (225°F). The fuel system, heated oxygen and misfire monitors have not completed. The calibrated time to set DTC P0116 has expired. |
||
| Possible Causes: |
|
||
| Diagnostic Aids: | Make sure the IAT and the engine coolant temperature are similar when the engine is cold. Also make sure the ECT or CHT sensor and the actual engine operating temperatures are the same. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles with only a (CHT) sensor | - | - | GO to Pinpoint Test DL . |
| All others | - | - | GO to Pinpoint Test DX . |