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 PCM 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

This diagnostic monitors the phasing response rate and determines whether the response rate is fast enough. A state machine is used to capture the response rate. The measured results are then compared to an allowable threshold. The threshold is a function of the oil temperature and the requested desired rate. Test of the phases response rate requires an engine speed or engine load change.
PCM detects CAM phasing average rate while cam offset is available.
If the CAM phasing rate is failure in 12 times out of 15 CAM phasing test PCM determines that a fault exists and a DTC is stored.

DTC Detecting Condition





Signal Waveform