Circuit description
The resistance of the thermistor built into the oil temperature sensor changes as the oil temperature changes. The engine oil temperature sensor is connected to the engine control computer in the same way the inlet air temperature sensor is connected.
NOTE:
When either of these DTCs is stored, the engine control computer enters fail-safe mode. The engine control computer fixes the specified engine oil temperature at 70°C {158°F} during the fail-safe mode operation. The engine control computer continues failsafe mode operation until the normal condition is restored.
DTC DETECTION CONDITION
| DTC No. | DTC detection condition | Suspected parts |
|---|---|---|
| P0197 | The voltage for the engine oil temperature sensor is less than 0.203 V for 0.5 second or more. (1 trips detection logic) |
|
| P0198 | The voltage for the engine oil temperature sensor is 4.698 V or higher for 0.5 second or higher. (1 trips detection logic) |