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 CAM phaser error while CMP signal is normally generating and vehicle is driving in 2000-3000 rpm.
If the CAM phaser does not move although ECM commands OCV duty cycle 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 CKPS & IN-CMPS at idle.
Fig.2) Normal waveform of CKPS & IN-CMPS at acceleration with load.
Fig.3) Normal data of IN-CVVT at idle.
Fig.4) Normal operating data of IN-CVVT

This example shows a typical Crankshaft Position Sensor (CKPS) and Camshaft Position Sensor (CMPS) waveform at idle. (Fig 1.) If the 17th signal of the CKPS after missing tooth is aligned with the high signal of the CMPS at idle, ECM recognizes that Synchronization between CKPS and CMPS is completed. Under accelerating condition, the number of teeth between missing tooth and tooth aligned with edge of the CMPS high signal is decreased from idle condition. (Fig 2.)