Component Location
General Description
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.
DTC Description
If the real angle can not follow the target angle over 10 times, ECM sets DTC P0012.
DTC Detecting Condition
Item | Detecting Condition | Possible Cause |
DTC Strategy | Target error check
| Poor connection
Contamination of Oil / Clog of Oil path
OCV
CVVT
|
Enable Conditions | Coolant temperature : 60~110?
Engine oil temperature : 60~110?
|
Threshold Value | Counter of failed following target valve timing > 10 times
|
Diagnostic Time | -
|
MIL ON Condition | 3 driving cycle
|
Specification
Item | Specification |
Coil Resistance (O) | 6.9 ~ 7.9 [20 ? 68 ?] |
Diagnostic Circuit Diagram
Signal Waveform & Data
The ECM controls OCV by duty value.