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 compensate 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.
Item | Detecting Condition | Possible cause | |||||
DTC Strategy | ● Determines if the oil temperature value is rational, compared to coolant and intake air temperature. | ● Faulty OTS ● PCM | |||||
Enable Conditions | Case1 | ● Engine run time after startup ＜ 30 sec ● Soak period required ＞ 300 min | |||||
Case2 | ● Minimum engine run time ＞ 800 sec | ||||||
Threshold value | Case1 | ● The difference in temperature between oil and coolant temperatures at startup. ＞ 35℃(63°F) | |||||
Case2 | ● The difference in temperature between oil temperature and intake air temperature at startup ＞ 35℃(63°F) | ||||||
Diagnosis Time | ● Continuous (More than 800 sec.) | ||||||
MIL On Condition | ● No MIL ON (DTC only) | ||||||
Temperature(℃/℉) | Resistance(kΩ) | |||||
-20℃/ -4℉ | 16.52kΩ | |||||
20℃/ 68℉ | 2.45kΩ | |||||
80℃/ 176℉ | 0.29kΩ | |||||
Check DTC Status
Connect scantool to Data Link Connector(DLC).
IG "ON".
Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
Read "DTC Status" parameter.
Is parameter displayed "Present fault"?
▶ Go to "Component Inspection" procedure.
▶ Fault is intermittent caused by PCM memory was not cleared after repair. Erase DTC and drive the vehicle to satisfy the enable condition then, go to " Component Inspection" procedure.
IG "ON" ＆ ENG "OFF"
Monitor Oil Temperature parameter on the scantool
IG "OFF" ＆ ENG "OFF"
Disconnect OTS connector.
Measure resistance between signal and ground terminals of OTS connector after checking out the oil temperature with scantool.
Temperature(℃/℉) | Resistance(kΩ) | |||||
-20℃/ -4℉ | 16.52kΩ | |||||
20℃/ 68℉ | 2.45kΩ | |||||
80℃/ 176℉ | 0.29kΩ | |||||
Is the measured resistance within specification ?
▶ Go to "Verification of Vehicle Repair" procedure.
▶ Substitute with a known - good OTS and check for proper operation. If the problem is corrected, replace OTS and go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scantool and select "DTC" button.
Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
Read "DTC Status" parameter
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC
▶ Go to the applicable troubleshooting procedure.
