Different from the existing fixed cam phase angle type, CVVT(Continuously Variable Valve Timing) is the device which varies cam phase angle continuously to be optimum. And with engine oil pressure, it operates. CVVT consists of OCV(Oil Control Valve) and cam phaser. OCV, mounted on cylinder head, controlls the amount and direction of oil delivered to cam phaser by oil valve which is connected to a solenoid. Cam phaser, rotating cam phaser rotor with pressure and amount of oil produced by OCV, rotates cam shaft forcefully for or against the rotating direction and finally, cam shaft phase changes. With the appliance of CVVT, engine power,fuel efficiency and the quality of exhaust gas are improved.
If there is a delay between the target angle and the real angle over 10 times, ECM sets DTC P0011.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Slow response check | 1. Poor connection 2. Contamination of Oil / Clog of Oil path 3. OCV 4. CVVT |
Enable Conditions |
•
Coolant temperature > -5℃
•
Time after engine start > 3.5s | |
Threshold Value |
•
Counter of delayed following target valve timing > 10 times | |
Diagnostic Time |
•
| |
MIL ON Condition |
•
3 driving cycle |
Item | Specification |
Coil Resistance (Ω) | 6.9 ~ 7.9 [20 ℃ 68 ℉] |
The ECM controls OCV by duty value.
