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 (ECM) compensates the oil-flow control valve operation time.
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. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
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.
●
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 coolanttemperatures at startup. ＞35℃(63°F)
Case2
●
The difference in temperature between oil temperatureand intake air temperature at startup ＞ 35℃(63°F)
Diagnosis Time
●
Continous
(More than 800 sec.)
MIL On Condition
●
2 Driving Cycles
SPECIFICATION
Temperature(℃/℉)
Resistance(kΩ)
-20℃/ -4℉
16.52kΩ
20℃/ 68℉
2.45kΩ
80℃/ 176℉
0.29kΩ
SCHEMATIC DIAGRAM
MONITOR DTC STATUS
1.
Check DTC Status
(1)
Connect scantool to Data Link Connector(DLC).
(2)
IG "ON".
(3)
Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC's information from the DTCs menu
(4)
Read "DTC Status" parameter.
(5)
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 codition then,go to " Component Inspection" procedure.
TERMINAL AND CONNECTOR INSPECTION
1.
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3.
Has a problem been found?
▶ Repair or replace if necessary and go to "Verification of Vehicle Repair" procedure
▶ Go to "signal Circuit Inspection" procedure.
SIGNAL CIRCUIT INSPECTION
1.
Check Voltage
(1)
IG "OFF" ＆ ENG "OFF"
(2)
Disconnect OTS connector
(3)
IG "ON" ＆ ENG "OFF"
(4)
Measure voltage between harness terminal 1 of OTS and chassis ground.
Specification : Approx. 5V
(5)
Is the measured voltage within specification ?
▶ Go to "Ground Circuit Inspection" procedure.
▶ Go to "Check open in harness" as follow.
2.
Check open in harness
(1)
IG "OFF" ＆ ENG "OFF"
(2)
Disconnect OTS and PCM connector.
(3)
Measure resistance between terminal 1 of OTS harness connector and terminal 4 of PCM harness connector.
Specification : Approx. below 1Ω
(4)
Is the measured resistance within specification ?
▶ Go to "Ground Circuit Inspection" procedure.
▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
1.
IG "OFF" ＆ ENG "OFF"
2.
Disconnect OTS connector
3.
Measure voltage between terminal 1 of OTS harness connector and chassis ground.
4.
Measure voltage between terminals 1 and 2 of OTS harness connector.
▶ Repair or replace contact resistance or open in harness and then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1.
Check resistance of OTS
(1)
IG "ON" ＆ ENG "OFF"
(2)
Monitor Oil Temperature parameter on the scantool
(3)
IG "OFF" ＆ ENG "OFF"
(4)
Disconnect OTS connector.
(5)
Measure resistance between terminal 1 and 2 of OTS connector after checking out the oil temperature with scantool
Specification :
Temperature(℃/℉)
Resistance(kΩ)
-20℃/ -4℉
16.52kΩ
20℃/ 68℉
2.45kΩ
80℃/ 176℉
0.29kΩ
(6)
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 andgo to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
2.
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
3.
Read "DTC Status" parameter
4.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC.
