The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing for every driving condition. The ECM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions.
PCM monitors OCV stuck while cam sinal is normally generating and Valve cleaning is not in progress .
If the CAM Acutal Position is too high or low and Difference between Cam Actual Position and Desire Position is higher than 20° PCM determines that a fault exists and a DTC is stored.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Determines if oil control valve is stuck | ● Oil Pressure Loss ● OCV seizure |
Enable Conditions | ● Valve cleaning not in progress ● CAM signal is normally generating | |
Threshold value | Case 1 | ● Cam Actual Position > 50 CAD or Difference between CAM Actual Position and Desire Position > 20 CAD |
Case 2 | ● Cam Actual Position < 5 CAD or Difference between CAM Actual Position and Desire Position > 20 CAD | |
Diagnosis Time | ● Continuous (Within 1min.) | |
MIL On Condition | ● 2 driving Cycle |
Resistance (Ω) | 6.7 ~ 7.7 |
