DTC P0196 Engine Oil Temp. Sensor Range / Performance: General Description

In CVVT system, the working fluid is engine oil. But its density varies according to temperature, PCM performs oil quantity correction based on the signal from engine oil temperature sensor over the various range of temperature. Main function of Oil Temperature Sensor is as follows.

1. intake air valve control solenoid (oil control valve) duty correction: As coil resistance varies according to oil temperature, excessive current flows at low temperature and low current at high temperature without duty correction. Therefore, PCM performs duty correction properly according to output signal from oil temperature sensor to supply constant current which is free from the change of oil temperature.
2. CVVT system operation starting temperature determination: As CVVT response gets weaker due to the friction of engine components such as valve at low temperature, PCM operates CVVT at above specific temperature based on output signal from oil temperature sensor.
3. improved CVVT controllability: CVVT response speed varies as oil temperature, PCM improves controllability throughout estimating response speed with oil temperature sensor output signal.