P0197 - Engine Oil Temperature Sensor Low
- Engine Oil Temperature sensor harness is open or shorted
- Engine Oil Temperature sensor circuit poor electrical connection
The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine oil 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.
Any information is appreciated. Thanks