Component Location
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 Pressure Sensor is as follows.
intake air valve control solenoid(oil control valve) duty correction : As coil resistance varies according to oil temperature, excessive current flows at low temperture 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.
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 temperture based on output signal from oil temperture sensor.
improved CVVT controllability : CVVT response speed varies as oil temperature, PCM improves controllability throughout estimating response speed with oil temperture sensor output signal.
DTC Description
Checking the oil temperture , coolant temperature and intake air temperature every 25 sec. under detecting condition, if the difference in temperature at start-up exceeds threshold value, PCM sets P0196.
DTC Detecting Condition
Item | Detecting Condition | Possible cause |
DTC Strategy | ? Determines if the oil temperature value is rational, compared to coolant and intake air temperature. | ? Poor connection ? Open or short in harness ? Faulty OTS ? PCM |
Enable Conditions | ? Engine run time after startup < 30 sec ? Minimum soak period required > 270 min |
Threshold value | ? The difference in temperature between oil and coolant temperatures at startup. > 35°C(63°F) ? The difference in temperature between oil temperature and intake air temperature at startup > 35°C(63°F) |
Diagnosis Time | ? Continuous (More than 12.5 sec.failure for every 25 sec.test) |
MIL On Condition | ? No MIL ON(DTC only) |
Specification
Temperature(°C/°F) | Resistance(k?) |
-20°C/ -4°F | 16.52k? |
20°C/ 68°F | 2.45k? |
80°C/ 176°F | 0.29k? |
Schematic Diagram