The fluid of the CVVT is the engine oil and its density changes according to the engine oil temperature. At this time the Oil Temperature Sensor (OTS) helps compensation against the temperature differences. The Oil Temperature Sensor measures the engine oil temperature before the engine oil comes into the Oil-flow Control Valve (OCV). According to the measured temperature, the Engine Control Module (PCM) compensates the oil-flow control valve operation time.
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. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
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 | ● 2 Driving Cycles |
Temperature(°C/°F) | Resistance(kΩ) |
-20°C/ -4°F | 16.52kΩ |
20°C/ 68°F | 2.45kΩ |
80°C/ 176°F | 0.29kΩ |
