General Information

Component Location





General Description

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.

DTC Description

ECM monitors OCV stuck while cam sinal is normally generating and Valve cleaning is not in progress.
If the CAM Actual Position is too high or low and Difference between Cam Actual Position and Desire Position is higher than 20 ° ECM determines that a fault exists and a DTC is stored.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data
















Fig.1) Normal waveform of OCV at idle.
Fig.2) Normal waveform of OCV at acceleration. (3500 rpm)
Fig.3) Normal data of IN-CVVT at idle.
Fig.4) Normal operating data of IN-CVVT