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 the real angle can not follow the target angle over 10 times, PCM sets DTC P0012.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Target error check | ● Poor connection ● Contamination of Oil / Clog of Oil path ● OCV ● CVVT |
Enable Conditions | ● Time after engine start > 10~60s ● Coolant temperature : 60~110℃ ● Engine oil temperature : 60~110℃ ● Reference position adaption completed ● CVVT control condition activated | |
Threshold Value | ● Target following fail > 10 times | |
Diagnostic Time | ||
MIL ON Condition | ● 2 driving cycle |
ITEM | Specification |
Coil Resistance (Ω) | 7.4 ± 0.5 Ω (20℃) |
